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  • 1. Andersson, L. I.
    et al.
    Hedekvist, P. O.
    Rudberg, B. G. R.
    Djupsjöbacka, Anders
    Ericsson, Sweden.
    Andrekson, P. A.
    10 Gb/s Optical Transmission using a Silicon Bipolar Chipset1995Inngår i: IEEE/LEOS 1995 Digest of the LEOS Summer Topical Meetings. Flat Panel Display Technology, 1995, s. 59-60Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A 10 Gb/s silicon chip set including a 8:1 MUX, a 1.8 DMUX, a dynamic divider, and circuits for clock recovery is described. Results from optical transmission experiments utilizing dispersion compensation techniques such as prechirp and MSSI, and bridging distances from 50 to 100 km, will be presented.

  • 2.
    Aurelius, Andreas
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Jacobsen, Gunnar
    RISE., Swedish ICT, Acreo.
    New Method for Measuring Probablility Density Function of Modulated Optical Signals, demonstrated on EDFA SOA2006Inngår i: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 27, nr 3, s. 168-71Artikkel i tidsskrift (Fagfellevurdert)
  • 3. Benedetto, S.
    et al.
    Djupsjöbacka, Anders
    Ericsson, Sweden.
    Lagerstrom, B.
    Paoletti, R.
    Poggiolini, P.
    Mijic, G.
    Multilevel polarization modulation using a specifically designed LiNbO/sub 3/ device1994Inngår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 6, nr 8, s. 949-951Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Binary and multilevel optical polarization modulation (POLSK) is an innovative transmission technique, suitable for both coherent and direct detection. To prove its feasibility, we have built a flexible polarization modulator based on a specifically designed LiNbO/sub 3/ device. We show that it can generate any state of polarization and therefore it is suitable for transmission of any binary or multilevel POLSK constellation. Once electrically equalized, the modulator has a 4 GHz bandwidth. To test the modulator with actual digital modulation, we set up a coherent binary experiment at 800 Mbit/s, and attained a sensitivity 1.5 dB away from the noise limit of the receiver.

  • 4.
    Brunnström, Kjell
    et al.
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Andrén, Börje
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Schenkman, Bo
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Hamsis, Omar
    RISE Research Institutes of Sweden, Digitala system, Prototypande samhälle.
    Recommended precautions because of Covid-19 for perceptual, behavioural,quality and user experience experimentswith test persons in indoor labs2020Rapport (Annet vitenskapelig)
    Abstract [en]

    Based on the recommendations from the Public Health Agency of Sweden(Folkhälsomyndigheten; FHM) and a set of internal rules from RISE, the followingrules are published for how to conduct experiments involving test persons in the timesof the pandemic Covid-19. The recommendations are for non-invasive and non-medicaltests, e.g. perceptual, consumer, ergonomic and human-computer interaction teststaking place in an indoor laboratory.

    Specifically, in this document we are specifying how experiments with test personstargeting audio and visual presentations should be done considering necessaryprecautions imposed by the Covid-19 pandemic. Laboratory experiments with testpersons, as it involves inviting people to the lab, require particular planning and carefulconsideration, if they are to be carried out safely because of the risks imposed by theCovid-19 pandemic. The safety aspects are valid for both the invited test persons andare equally important for the health of the test leaders.

    Fulltekst (pdf)
    fulltext
  • 5.
    Brunnström, Kjell
    et al.
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Andrén, Börje
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Objective video quality assessment methods for Video assistant refereeing (VAR) Systems2021Rapport (Annet vitenskapelig)
    Abstract [en]

    This report describes the work and conclusions drawn after phase 4 in the project “Assessment methods for Video assistant refereeing (VAR) System”.

    The performance of six different video quality models have been evaluated, that were identified during phase 1, against the subjective video quality database that was created during phase 3. The results are slightly different for 1080p compared to 1080i. For 1080p the models VQM_VFD, SSIM and VMAF performs the best with Pearson Correlation Coefficients (PCC) above 0.9. For 1080i the PCC drops a bit overall and then VMAF and VQM_VFD are close in performance and performing the best. The overall performance for both formats VMAF an VQM_VFD stands out as the best models. In this comparison VQM_VFD has the added advantage to also be able to perform its own registration i.e. to fix any misalignment between the reference video and the distorted one.

    Fulltekst (pdf)
    fulltext
  • 6.
    Brunnström, Kjell
    et al.
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Andrén, Börje
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Objective video quality assessment methods for Video assistant refereeing (VAR) System: Phase 4 report on synchronizationand latency measurements2021Rapport (Annet vitenskapelig)
    Abstract [en]

    This report describes the work and conclusions drawn after phase 4 for the synchronization and latencymeasurements in the project “Assessment methods for Video Assistant Refereeing (VAR) System”.In phase 4, we have focused on up-dating the software so that it automatically detects: p (progressive),i (interlaced), and PsF (progressive segmented frame) formats and analyse the different video types. Wehave also the performed a field-test with an OB-van at an arena.

    Fulltekst (pdf)
    fulltext
  • 7.
    Brunnström, Kjell
    et al.
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Andrén, Börje
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Video quality based on a user study with video professionals for Video Assisted Refereeing (VAR) Systems2021Rapport (Annet vitenskapelig)
    Abstract [en]

    This document describes a user experiment with the purpose of finding a baseline quality that is suitable for system and a database for training and evaluating the objective quality measurement methods suitable for assessing the video quality of VAR systems. 

    A user experiment was performed involving 25 Swedish video experts. Three different video formats were incorporated 1080p, 1080i and 540i. The degradations were in most cased done using encoding with Motion JPEG (MJPEG) and H.264 in the bitrate range from 80 Mbit/s down to 10 Mbit/s. 

    MJPEG loses quality very fast and already at 80 Mbit/s it has significantly lower quality than the uncompressed reference and then for even lower bitrates the quality falls quickly to bad. On the other hand, H.264 was not found to be significant different from the uncompressed reference until the bitrate had dropped to 10 Mbit/s for 1080p. For 1080i 20 Mbit/s was also weakly and for 540i 20 Mbit/s was significantly lower for some of the scaling methods. For 1080i the deinterlacing requires careful consideration, since the deinterlacing scheme introduced received very low quality scores. For the scaling scheme lanczos was the best and bilinear the worst. 

    Requirement levels on bitrate and the encoders MJPEG and H.264 based on this experiment•    MJPEG require more than 120 Mbit/s•    H.264 require more than 50 Mbit/s

    Fulltekst (pdf)
    fulltext
  • 8.
    Brunnström, Kjell
    et al.
    RISE Research Institutes of Sweden, Digitala system, Industriella system. Mid Sweden University, Sweden.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Billingham, Johsan
    FIFA Fédération Internationale de Football Association, Switzerland.
    Wistel, Katharina
    FIFA Fédération Internationale de Football Association, Switzerland.
    Andrén, Börje
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Ozolins, Oskars
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Evans, Nicolas
    FIFA Fédération Internationale de Football Association, Switzerland.
    Video expert assessment of high quality video for Video Assistant Referee (VAR): A comparative study2023Inngår i: Multimedia tools and applications, ISSN 1380-7501, E-ISSN 1573-7721Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The International Football Association Board decided to introduce Video Assistant Referee (VAR) in 2018. This led to the need to develop methods for quality control of the VAR-systems. This article focuses on the important aspect to evaluate the video quality. Video Quality assessment has matured in the sense that there are standardized, commercial products and established open-source solutions to measure it with objective methods. Previous research has primarily focused on the end-user quality assessment. How to assess the video in the contribution phase of the chain is less studied. The novelties of this study are two-fold: 1) The user study is specifically targeting video experts i.e., to assess the perceived quality of video professionals working with video production. 2) Six video quality models have been independently benchmarked against the user data and evaluated to show which of the models could provide the best predictions of perceived quality. The independent evaluation is important to get unbiased results as shown by the Video Quality Experts Group. An experiment was performed involving 25 video experts in which they rated the perceived quality. The video formats tested were High-Definition TV both progressive and interlaced as well as a quarters size format that was scaled down half the size in both width and height. The videos were encoded with both H.264 and Motion JPEG for the full size but only H.264 for the quarter size. Bitrates ranged from 80 Mbit/s down to 10 Mbit/s. We could see that for H.264 that the quality was overall very good but dropped somewhat for 10 Mbit/s. For Motion JPEG the quality dropped over the whole range. For the interlaced format the degradation that was based on a simple deinterlacing method did receive overall low ratings. For the quarter size three different scaling algorithms were evaluated. Lanczos performed the best and Bilinear the worst. The performance of six different video quality models were evaluated for 1080p and 1080i. The Video Quality Metric for Variable Frame Delay had the best performance for both formats, followed by Video Multimethod Assessment Fusion method and the Video Quality Metric General model. 

    Fulltekst (pdf)
    fulltext
  • 9.
    Brunnström, Kjell
    et al.
    RISE Research Institutes of Sweden, Digitala system, Industriella system. Mid Sweden University, Sweden.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Billingham, Johsan
    FIFA Fédération Internationale de Football Association, Switzerland.
    Wistel, Katharina
    FIFA Fédération Internationale de Football Association, Switzerland.
    Andrén, Börje
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Ozolins, Oskars
    RISE Research Institutes of Sweden, Digitala system, Industriella system. KTH Royal Institute of Technology, Sweden.
    Evans, Nicolas
    FIFA Fédération Internationale de Football Association, Switzerland.
    Video quality of video professionals for Video Assisted Referee (VAR)2023Inngår i: IS and T International Symposium on Electronic Imaging Science and Technology, ISSN 2470-1173, Vol. 35, nr 10, artikkel-id 259Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Changes in the footballing world’s approach to technology and innovation contributed to the decision by the International Football Association Board to introduce Video Assistant Referees (VAR). The change meant that under strict protocols referees could use video replays to review decisions in the event of a "clear and obvious error" or a "serious missed incident". This led to the need by Fédération Internationale de Football Association (FIFA) to develop methods for quality control of the VAR-systems, which was done in collaboration with RISE Research Institutes of Sweden AB. One of the important aspects is the video quality. The novelty of this study is that it has performed a user study specifically targeting video experts i.e., to measure the perceived quality of video professionals working with video production as their main occupation. An experiment was performed involving 25 video experts. In addition, six video quality models have been benchmarked against the user data and evaluated to show which of the models could provide the best predictions of perceived quality for this application. Video Quality Metric for variable frame delay (VQM_VFD) had the best performance for both formats, followed by Video Multimethod Assessment Fusion (VMAF) and VQM General model.

    Fulltekst (pdf)
    fulltext
  • 10.
    Brunnström, Kjell
    et al.
    RISE Research Institutes of Sweden, Digitala system, Industriella system. Mid Sweden University, Sweden.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Ozolins, Oskars
    RISE Research Institutes of Sweden, Digitala system, Industriella system. KTH Royal Institute of Technology, Sweden.
    Billingham, Johsan
    FIFA Fédération Internationale de Football Association, Switzerland.
    Wistel, Katarina
    FIFA Fédération Internationale de Football Association, Switzerland.
    Evans, Nicolas
    FIFA Fédération Internationale de Football Association, Switzerland.
    Quality measurement methods for video assisting refereeing systems2023Inngår i: Sports Engineering, ISSN 1369-7072, E-ISSN 1460-2687, Vol. 26, nr 1, artikkel-id 17Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Changes in the footballing world’s approach to technology and innovation, along with major advancements in broadcasting contributed to the decision by the International Football Association Board to introduce Video Assistant Referees in 2018. The change meant that under strict protocols referees could use video replays to review decisions in the event of a “clear and obvious error” or a “serious missed incident”. At the time of writing 48-Member Associations have introduced the Video Assistant Referees protocol in at least one of their tournaments and there are many technology providers who work with organisers to implement the Video Assistant Referees systems. To ensure that the use of Video Assistant Referees has a positive effect on the game, Fédération Internationale de Football Association collaborated with the RISE Research Institutes of Sweden to develop objective test methods that could be used to ensure that a system can provide an adequate solution. Each provider must be able to pass requirements that ensure that they can deal with the challenges of processing, coding, decoding, synchronising, and re-formatting of the broadcast feeds. This article will describe the development of the test methods and illustrate some initial results from a test event on Video Assistant Referees system candidates. The methods have shown to be robust and appropriate for their intended purpose and will be developed over the years to ensure the quality of Video Assistant Referees. The developed measurement methods are general and can be applied to other broadcast and video systems as well as to other sports. © 2023, The Author(s).

    Fulltekst (pdf)
    fulltext
  • 11. Chacinski, M.
    et al.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Westergren, U.
    Schatz, R.
    Fonjallaz, P.
    Tipsuwannakul, E.
    Udvary, E.
    400km transmission of STM-16 data on baseband and DVBT on 40GHz subcarrier2008Inngår i: 2008 International Conference on Telecommunications, 2008, s. 1-3Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A 400 km standard single mode fiber (SSMF) link with a single light-intensity modulator was upgraded for simultaneous transmission of STM-16 2.5 Gbps baseband data and digital-video-broadcast-terrestrial DVBT utilizing a 40 GHz subcarrier. An optical circulator and narrowband fiber Bragg gratings (FBG) were used to separate the signals in the optical domain and allow for simple direct baseband detection of both.

  • 12. Chacinski, M.
    et al.
    Schatz, R.
    Westergren, U.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Extension of 40 Gbps link with a directly detected 2.5 Gbps subcarrier channel2009Inngår i: 2009 11th International Conference on Transparent Optical Networks, 2009Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Simultaneous transmission was achieved of 40 Gbps at baseband and 2.5 Gbps modulation on a 50 GHz subcarrier utilizing a single 40 Gbps light-intensity modulator. A novel reception method based on optically separated baseband and single sideband channel permits direct detection of both signals with use of bandwidth limited photodiodes and dispersion tolerant transmission. This method can be used to increase the total capacity of an original 40 Gbps optical link to also carry a secondary signal.

  • 13.
    Djupsjöbacka, Anders
    Ericsson, Sweden.
    A linearization concept for integrated-optic modulators1992Inngår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 4, nr 8, s. 869-872Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A novel linearization concept to reduce the distortion products from integrated-optic modulators is proposed and analyzed. The proposed linearization concept could be used on any type of modulator with an odd transfer function. A dual parallel Mach-Zehnder modulator was linearized, and the results are compared to those obtained using a conventional linearization concept. The proposed concept gives a 40% higher modulation index compared to a concept based on reduction of the cubic nonlinearity of the modulator

  • 14.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Calculation of Signal Outage due to Polarization-Mode Dispersion2001Inngår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 13, nr 7, s. 660-Artikkel i tidsskrift (Fagfellevurdert)
  • 15.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Impact of Polarization Controllers in Polarization-Mode Dispersion Emulators2002Inngår i: Journal of Optical Communication, Vol. 23, nr 5Artikkel i tidsskrift (Fagfellevurdert)
  • 16.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    On Differential Group-Delay Statistics for Polarization-Mode Dispersion Emulators2001Inngår i: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 19, nr 2, s. 285-Artikkel i tidsskrift (Fagfellevurdert)
  • 17.
    Djupsjöbacka, Anders
    Ericsson, Sweden.
    Prechirped duobinary modulation1998Inngår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 10, nr 8, s. 1159-1161Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The proposed modulation scheme enables us to combine the advantages of the duobinary modulation, i.e., reduced transmission bandwidth compared to traditional intensity modulation, together with the advantages of prechirped modulation. Below, a theoretical investigation is presented where four different methods of modulating a double electrode Mach-Zehnder modulator is compared. It will be shown that the proposed prechirped duobinary modulation scheme will have the best performance in terms of power penalty.

  • 18.
    Djupsjöbacka, Anders
    Ericsson, Sweden.
    Residual chirp in integrated-optic modulators1992Inngår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 4, nr 1, s. 41-43Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The authors have analyzed and measured the dispersion effects of residual chirp arising from asymmetry in field overlap in Mach-Zehnder structures. A clear influence of chirp was seen at 7 Gb/s and a propagation length of 75-km nondispersion shifted fiber at lambda =1.55 mu m. It is shown that a MZ-modulator with field overlap in one arm only and operated in the blue-shift mode is the best choice for single coplanar stripline (CPS) electrode MZ-modulators in this case. Calculations have shown good agreement with measured results. This indicates that a simple model for fiber mode propagation have shown good agreement with measured results. This can be used together with a FFT-algorithm for calculating the effect of residual chirp from external modulators in multigigabit dispersive fiber-optic systems.

  • 19.
    Djupsjöbacka, Anders
    Ericsson, Sweden.
    Time division multiplexing using optical switches1988Inngår i: IEEE Journal on Selected Areas in Communications, ISSN 0733-8716, E-ISSN 1558-0008, Vol. 6, nr 7, s. 1227-1231Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Design considerations are considered for optical time-division multiplexing in terms of bandwidth requirements for the modulators and switches for a particular multiplexing scheme and the corresponding drive signals are derived using a time-domain approach. It is shown that these requirements are stricter than expected from simple considerations. Different types of multiplexing schemes are analyzed and are shown to behave differently due to varying chirping properties; this chirping is also calculated. A comparison to nonmultiplexed systems is made

  • 20.
    Djupsjöbacka, Anders
    KTH Royal Institute of Technology, Sweden.
    Traveling Wave Modulators in Lithum Niobate1995Doktoravhandling, monografi (Annet vitenskapelig)
  • 21.
    Djupsjöbacka, Anders
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    A Method to Calculate PMD-Induced Eye-Opening Penalty Signal Outage for RZ-Modulated Signal Formats2008Inngår i: IEEE transactions on intelligent transportation systems (Print), ISSN 1524-9050, E-ISSN 1558-0016, Vol. 26, s. 3186-89Artikkel i tidsskrift (Fagfellevurdert)
  • 22.
    Djupsjöbacka, Anders
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    Källgren, Dan
    TeliaSonera AB, Sweden.
    Measured Temporal statistics of the DGD RMS-Value in Buried Optical Fibers2009Inngår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 21, nr 24, s. 1801-1803Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The behavior of the differential group delay (DGD)root-mean-square (rms) value is investigated for a buried G.652fiber line in a metropolitan fiber plant outside Stockholm, Sweden.This study presents measurement results from two different mea-surement periods where the same fiber and the same measurementequipment was used. In total,2800 hours of measurements wereperformed. As expected, the recorded DGD rms-value variedwith time. The measured standard deviation for the statistics ofthe DGD rms-value fits reasonably well with values presentedin literature. The fiber line, which showed a DGD rms-value of0.45 ps in average, had an extremely long time constant. Evenafter2800 hours of measurements we have not closed in on theexpected asymptotic distribution of the measured DGD rms-value

  • 23.
    Djupsjöbacka, Anders
    et al.
    RISE., Swedish ICT, Acreo.
    Jacobsen, G
    RISE., Swedish ICT, Acreo.
    Tromborg, B
    Dynamic stimulated Brillouin scattering analysis2000Inngår i: IEEE transactions on intelligent transportation systems (Print), ISSN 1524-9050, E-ISSN 1558-0016, Vol. 18, s. 416-Artikkel i tidsskrift (Fagfellevurdert)
  • 24.
    Djupsjöbacka, Anders
    et al.
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Åstlund, L
    Proximion Fiber Systems AB, Sweden.
    Estimating Eye-opening Penalty with Aid of the Ripple Function of Fiber Bragg-gratings2007Inngår i: Journal of Optical Communications, Vol. 28, s. 91-95Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We investigate six different methods presented in litera-ture to estimate eye-opening penalty for dispersion-com-pensating fiber Bragg gratings with aid of the grating’s ripple function. The investigation is based on theoretical ripple functions as well on measurement results of three continuously chirped gratings. The gratings in question offer full wavelength coverage between 1530 nm and 1565 nm. We will show that the eye-opening penalty de-pends on the phase and frequency of the grating’s ripple function as well as to pattern length and to pulse form of the signal used. Since the estimation methods do not ac-count for these properties, their accuracy is shown to be limited.

  • 25. Djupsjöbacka, Anders
    et al.
    Sahlen, O.
    Dispersion compensation by differential time delay1994Inngår i: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 12, nr 10, s. 1849-1853Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A technique for optical pre- or postdistortion in order to compensate for fiber dispersion is discussed theoretically, The dispersion compensation device is based on differential time delay for the upper and the lower sideband of the modulated signal. The proposed scheme is primarily intended for high bit rate (>10 Gbit/s) time division multiplexed transmission, and in an ideal case the transmitting distance could be enhanced by a factor of 4 in a dispersive limited system. With more realistic demands on the dispersion compensation device, the gained distance is in the order of 2.5.

  • 26. dos Santos, A B
    et al.
    Jimenez, M R
    von der Weid, J P
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Statistical Measurements of BER Fluctuations Due to PMD in 10 Gb/s Optical Transmissions2002Inngår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 14, nr 7, s. 926-28Artikkel i tidsskrift (Fagfellevurdert)
  • 27.
    Fonjallaz, P.
    et al.
    RISE., Swedish ICT, Acreo.
    Yusta, E.
    Telefònica Research and Development, Spain.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Popov, M.
    RISE., Swedish ICT, Acreo.
    Cucala, L.
    Telefònica Research and Development, Spain.
    BER Assessment of Direct Optical Passband Filter for 24 GHz Millimetre-Wave Signals2005Inngår i: 2005 International Topical Meeting on Microwave Photonics, 2005, s. 225-228Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Bit Error Rate measurements are performed on a 155 MB/s signal modulating a 24 GHz microwave carrier after filtering using a superimposed fibre Bragg grating for assessment of the performance of such an all-optical filter. This passband filter has a 2 GHz 3-dB bandwidth, steep flanks and a low insertion loss. The extinction ratio is better than 15 dB. The filtering of an interference signal is demonstrated as a function of frequency. Transmission through 25 km standard fibre is shown to not have significant effect on the quality of the signal after filtering.

  • 28.
    Forzati, Marco
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, J.
    RISE., Swedish ICT, Acreo.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    IFWM suppression in NRZ transmission experiment at 40 Gb/s using asynchronous phase modulation2007Inngår i: Optics InfoBase Conference Papers, Optical Society of America , 2007Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The Asynchronous Phase Modulation (APM) scheme is experimentally studied for the first time. APM is shown to increase the power tolerance of NRZ-OOK over a 3x75-km link. © 2006 Optical Society of America.

  • 29.
    Forzati, Marco
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Asynchronous Phase Modulation for the Suppression of IFWM2007Inngår i: IEEE transactions on intelligent transportation systems (Print), ISSN 1524-9050, E-ISSN 1558-0016, Vol. 25, s. 2969-75Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Intrachannel four-wave mixing (IFWM) represents main source of impairments in fiber transmission at 40 Gb/s. A number of phase modulation techniques have been proposed to suppress the IFWM. In this paper, we study a cost-effective way of increasing the nonlinear tolerance of a 40-Gb/s wavelength division multiplexing transmission system by asynchronous phase modulation (APM). This can be achieved with one phase modulator placed after the wavelength multiplexer so that cost is shared by all channels. We show, by means of numerical simulations and laboratory experiments, that APM greatly improves the performance of ON-OFF-keying transmission.

  • 30.
    Forzati, Marco
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Li, J.
    RISE., Swedish ICT, Acreo.
    Melin, S.
    40 Gbit/s field experiment over 820 km transmission link designed for 10 Gbit/s using APRZ modulation format2006Inngår i: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 42, s. 991-92Artikkel i tidsskrift (Fagfellevurdert)
  • 31.
    Forzati, Marco
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Li, J.
    RISE., Swedish ICT, Acreo.
    Melin, S.
    TeliaSonera AB, Sweden.
    Carlden, H.
    TeliaSonera AB, Sweden.
    40-gb/s field transmission through 540 km ssmf using the aprz modulation format2005Inngår i: Optics InfoBase Conference Papers, Optical Society of America , 2005Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We report the first field transmission experiment using the APRZ modulation format for 40-Gb/s transmission through 540 km SSMF, which confirms the improved nonlinear tolerance of APRZ. The optimum phase-modulation amplitude in this experiment is p/2. 

  • 32.
    Forzati, Marco
    et al.
    Ericsson Telecom AB, Sweden.
    Mårtensson, Jonas
    Ericsson Telecom AB, Sweden.
    Anders, Berntson
    Ericsson Telecom AB, Sweden.
    Djupsjöbacka, Anders
    Ericsson Telecom AB, Sweden.
    Johannisson, Pontus
    RISE., Swedish ICT, Acreo. Chalmers University of Technology, Sweden.
    Reduction of intra-channel four-wave mixing using the alternate-phase RZ modulation format2002Inngår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 14, nr 9Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    —The authors propose a modulation format in which the phase of the signal pulses alternates, in order to reduce the intrachannel four-wave mixing. They demonstrate numerically that the performance of a 40-Gb/s transmission link can be substantially improved.

  • 33.
    Göreke, Hande
    et al.
    RISE Research Institutes of Sweden. Uppsala University, Sweden.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Schenkman, Bo
    RISE Research Institutes of Sweden, Digitala system, Industriella system. KTH Royal Institute of Technology, Sweden.
    Andrén, Börje
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Hermann, David S.
    Volvo Car Corporation, Sweden.
    Brunnström, Kjell
    RISE Research Institutes of Sweden, Digitala system, Industriella system. Mid Sweden University, Sweden.
    Perceptual Judgments of Simulated Low Temperatures in LCD based Vehicle Displays2023Inngår i: Digest of Technical Papers - SID International Symposium, John Wiley and Sons Inc , 2023, Vol. 54, nr 1, s. 595-598Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A well-known drawback with LCD-displays in cold is a slow pixel response leading to poor picture quality. Low temperatures can constitute a hazard in viewing important displays in cars. Perceptual experiments with 20 test-persons were conducted to find clear and acceptable ranges on screens simulating distortions in low temperatures. The results showed perception over clear and acceptable image quality was impaired beyond -20°C for the LCD-screen in the experiments. 

  • 34. Haunstein, Herbert
    et al.
    Rohde, Harald
    Forzati, Marco
    Pincemin, Erwan
    Mårtensson, Jonas
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Politi, Tanya
    Combating Physical Layer Degradations: Chapter 62010Inngår i: Core and Metro Networks / [ed] Alexandros Stavdas, 2010, s. 381-Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 35.
    Hermann, David
    et al.
    Volvo Car Corporation AB, Sweden.
    Djupsjöbacka, Anders
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Andrén, Börje
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Brunnström, Kjell
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo. Mid Sweden University, Sweden.
    Rydell, Niclas
    TCO Development AB, Sweden.
    Display panel certification system for the vehicle industry2017Inngår i: Digest of Technical Papers - SID International Symposium, 2017, Vol. 48, nr 1, s. 471-474Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The ever-increasing need for displaying in-vehicle visual information in a non-distracting way requires a high visual performance of automotive displays. For their procurement, deep technical and supply-chain knowledge is required. Therefore, based on our comparisons of in-vehicle and laboratory visual-performance measurements, we propose a certification system for automotive display panels.

  • 36.
    Lin, Rui
    et al.
    KTH Royal Institute of Technology, Sweden; Huazhong University of Science and Technology, China.
    Pang, Xiaodan
    RISE., Swedish ICT, Acreo.
    Ozolins, Oskars
    RISE., Swedish ICT, Acreo.
    Feng, Zhenhua
    Huazhong University of Science and Technology, China.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE., Swedish ICT, Acreo.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Fu, Songnian
    Huazhong University of Science and Technology, China.
    Liu, Deming
    Huazhong University of Science and Technology, China.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Performance evaluation of PAM and DMT for short-range optical transmission with high speed InGaAsP DFB-TWEAM2016Inngår i: 2016 Optical Fiber Communications Conference and Exhibition (OFC), 2016, artikkel-id 7537397Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We report on experimental results of 56-Gb/s OOK, PAM4 and 25-Gb/s DMT transmission with a high speed InGaAsP based monolithically integrated DFB-TWEAM, and evaluate different digital equalization implementations.

  • 37. Lindstrom, B.
    et al.
    Sundstrom, B.
    Granberg, M.
    Augustsson, T.
    Stensland, L.
    Djupsjöbacka, Anders
    Ericsson, Sweden.
    Larsson, A.
    Arvidsson, B.
    Ericssor, T. K.
    Combined multimode and singlemode fiber2002Inngår i: Optical Fiber Communication Conference and Exhibit, 2002, s. 628-629Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A future proof combined MM- and SM-fiber is presented, which combines the advantages of both fiber types and makes upgrading and downgrading cheap and simple.

  • 38.
    Mårtensson, Jonas
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Forzati, Marco
    RISE., Swedish ICT, Acreo.
    Li, Jie
    RISE., Swedish ICT, Acreo.
    Phase Modulation Schemes for Improving Intra-Channel Nonlinear Tolerance in 40 Gbit/s Transmission2003Inngår i: Conference on Optical Fiber Communication, Technical Digest Series, Institute of Electrical and Electronics Engineers Inc. , 2003, s. 662-663Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Several schemes for suppressing infra-channel non-linearities by introducing phase shifts between pulses are compared. Simulations and experiments show that sinusoidal phase modulation at 10 GHz provides a simple and effective means for improving the nonlinear tolerance in 40 Gbit/s transmission.

  • 39.
    Mårtensson, Jonas
    et al.
    RISE., Swedish ICT, Acreo.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Li, J.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Östlund, L.
    Proximion Fiber Systems AB, Sweden.
    Johanson, P.
    Proximion Fiber Systems AB, Sweden.
    Zin, L. D.
    Proximion Fiber Systems AB, Sweden.
    Field transmission using Fiber Bragg grating-based dispersion compensating modules with continuous response over the full C-band2006Inngår i: 2006 European Conference on Optical Communications Proceedings, ECOC 2006, 2006Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Fiber Bragg grating-based dispersion compensating modules with continuous response over the full C-band are demonstrated. Group delay characteristics are analysed and modules are used in 10-Gbit/s and 40-Gbit/s field experiments over 820 km installed fiber.

  • 40.
    Mårtensson, Jonas
    et al.
    Ericsson AB, Sweden.
    Li, J.
    Ericsson AB, Sweden.
    Anders, Berntson
    Ericsson AB, Sweden.
    Djupsjöbacka, Anders
    Ericsson AB, Sweden.
    Forzati, Marco
    Ericsson AB, Sweden.
    Suppression of intra-channel four-wave mixing by phase modulation at one quarter of bit rate2002Inngår i: Electronic Letters, Vol. 38, nr 23, s. 1463-65Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A proposed improvement of the nonlinear tolerance in 40 Gbit/s optical transmission by applying a 10 GHz phase modulation is presented. The improvement is obtained because intra-channel four-wave mixing (IFWM) is suppressed. It is shown, both by numerical simulations and experiments, that the penalty induced by IFWM is significantly reduced.

  • 41.
    Mårtensson, Jonas
    et al.
    Ericsson AB, Sweden.
    Li, Jie
    Ericsson AB, Sweden.
    Anders, Berntson
    Ericsson AB, Sweden.
    Djupsjöbacka, Anders
    Ericsson AB, Sweden.
    Forzati, Marco
    Ericsson AB, Sweden.
    Improvement of Nonlinear Tolerance in 40 Gbit/s Transmission by Phase Modulation at 10 GHz2002Inngår i: 2002 28TH European Conference on Optical Communication, 2002, Vol. 4Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We propose to suppress intra-channel four-wave-mixing (IFWM) in 40 Gbit/s optical transmission by applying a phase modulation at 10 GHz. Both numerical simulations and experiments show that the penalty induced by IFWM is significantly reduced

  • 42. Mårtensson, Jonas
    et al.
    Olsson, B. E.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Alping, A.
    RF-assisted DP-16-QAM 112 Gbit/s Transmission over 824 km of G.652 Fiber with without Inline Dispersion Compensation2012Inngår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 24, nr 2, s. 140-2Artikkel i tidsskrift (Fagfellevurdert)
  • 43. Niburg, M.
    et al.
    Eriksen, P.
    Gustafsson, K.
    Hesselbom, H.
    Palmskog, G.
    Robertsson, M.
    Tan, N.
    Akermark, K.
    Djupsjöbacka, Anders
    Juhola, T.
    Kerzar, B.
    Mokhtari, M.
    Schuppener, G.
    A complete sub-system of parallel optical interconnects for telecom applications1996Inngår i: 1996 Proceedings 46th Electronic Components and Technology Conference, 1996, s. 259-263Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Increased throughput and flexibility requirements in large-scale electronic equipment create needs for increased interconnection density capacity and re-configurability. The growing demand for new broadband interactive telecom and computer services is expected to enforce this development, which presents a challenge to traditional electronic interconnection techniques and an opportunity for new optical solutions, provided that the cost of introduction of the optical technology is affordable for both system operators and service users. The authors describe a complete sub-system of parallel optical interconnects (i.e., a total solution including the link itself and the equipment practice supporting the link) which exhibits both cost and performance benefits compared to a pure electrical or a serial optical solution.

  • 44. Olsson, B-E
    et al.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    Alping, A.
    112-Gbit/s RF-assisted dual carrier DP-16-QAM transmitter using optical phase modulator2011Inngår i: Optics Express, E-ISSN 1094-4087, Vol. 19, nr 26, s. 784-789Artikkel i tidsskrift (Fagfellevurdert)
  • 45. Olsson, B-E
    et al.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    Alping, A.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Rhodin, A.
    112 Gbit/s RF-Assisted Multicarrier DP-16-QAM Optical Transmission over Field Deployed Fiber Link2011Inngår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 23, nr 19, s. 1367-9Artikkel i tidsskrift (Fagfellevurdert)
  • 46.
    Ozolins, Oskars
    et al.
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Lin, Rui
    KTH Royal Institute of Technology, Sweden; Huazhong University of Science and Technology, China.
    Djupsjöbacka, Anders
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Mårtensson, Jonas
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Fröjdh, Krister
    Proximion AB, Sweden.
    Gan, Lin
    Huazhong University of Science and Technology, China.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Fu, Songnian
    Huazhong University of Science and Technology, China.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Liu, Deming
    Huazhong University of Science and Technology, China.
    Tong, Weijun
    YOFC Yangtze Optical fiber and Cable, China.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    112 Gbps/λ PAM4 inter-DCI with continuous-fiber Bragg grating based dispersion compensators2018Inngår i: Advanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF) OSA Technical Digest (online) (Optical Society of America, 2018), paper NeTh3F.3, 2018, artikkel-id NeTh3F.3Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We demonstrate 56 Gbaud/λ PAM4 inter - data center interconnects over 81 km single core single mode fiber and 33.6 km 7-core single mode fiber with continuous-fiber Bragg grating based chromatic dispersion compensators covering C-band.

  • 47.
    Puerta, R.
    et al.
    KTH Royal Institute of Technology, Sweden; Ericsson, Sweden.
    Han, M.
    KTH Royal Institute of Technology, Sweden; Beijing Jiaotong University, China.
    Joharifar, M.
    KTH Royal Institute of Technology, Sweden.
    Schatz, R.
    KTH Royal Institute of Technology, Sweden.
    Sun, Y. -T
    KTH Royal Institute of Technology, Sweden.
    Fan, Yuchuan
    RISE Research Institutes of Sweden, Digitala system, Industriella system. KTH Royal Institute of Technology, Sweden.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Maisons, G.
    mirSense, France.
    Abautret, J.
    mirSense, France.
    Teissier, R.
    mirSense, France.
    Zhang, L.
    Zhejiang University, China.
    Spolitis, S.
    Riga Technical University, Latvia.
    Wang, M.
    Beijing Jiaotong University,.
    Bobrovs, V.
    Riga Technical University, Latvia.
    Lourdudoss, S.
    KTH Royal Institute of Technology, Sweden.
    Yu, X.
    Zhejiang University, China.
    Popov, S.
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE Research Institutes of Sweden, Digitala system, Industriella system. KTH Royal Institute of Technology, Sweden; Riga Technical University, Latvia.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden; Riga Technical University, Latvia.
    NR Conformance Testing of Analog Radio-over-LWIR FSO Fronthaul link for 6G Distributed MIMO Networks2023Inngår i: Opt. Fiber Commun. Conf. Exhib., OFC - Proc., Institute of Electrical and Electronics Engineers Inc. , 2023Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We experimentally test the compliance with 5G/NR 3GPP technical specifications of an analog radio-over-FSO link at 9 μm. The ACLR and EVM transmitter requirements are fulfilled validating the suitability of LWIR FSO for 6G fronthaul. © 2023 The Author(s).

  • 48.
    Puerta, Rafael
    et al.
    KTH Royal Institute of Technology, Sweden; Ericsson, Sweden.
    Joharifar, M.
    KTH Royal Institute of Technology, Sweden.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Ostrovskis, A.
    Riga Technical University, Latvia.
    Sun, Y. -T
    KTH Royal Institute of Technology, Sweden.
    Maisons, G.
    mirSense, France.
    Abautret, J.
    mirSense, France.
    Teissier, R.
    mirSense, France.
    Zhang, L.
    Zhejiang Lab, China; Zhejiang University, China.
    Spolitis, S.
    Riga Technical University, Latvia.
    Bobrovs, V.
    Riga Technical University, Latvia.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Yu, X.
    Zhejiang Lab, China; Zhejiang University, China.
    Ozolins, Oskars
    RISE Research Institutes of Sweden, Digitala system, Industriella system. Riga Technical University, Latvia; KTH Royal Institute of Technology, Sweden.
    Pang, Xiaodan
    RISE Research Institutes of Sweden, Digitala system, Industriella system. Riga Technical University, Latvia; KTH Royal Institute of Technology, Sweden.
    Coherent Joint Transmission with 1024-QAM for 6G Distributed-MIMO Networks with Analog Radio-over-LWIR FSO Fronthaul Links2023Inngår i: 2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings (ACP/POEM), 2023Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Distributed-MIMO (D-MIMO) is a prospective solution for next-generation mobile networks to increase capacity and coverage. We experimentally validate 1024-QAM coherent joint transmissions in a two transmitter D-MIMO network including radio-over-LWIR FSO fronthaul links facilitating deployment and achieving diversity and power gains close to theoretical values.

  • 49.
    Puerta, Rafael
    et al.
    KTH Royal Institute of Technology, Sweden; Ericsson, Sweden.
    Joharifar, Mahdieh
    KTH Royal Institute of Technology, Sweden.
    Han, Mengyao
    KTH Royal Institute of Technology, Sweden.
    Djupsjöbacka, Anders
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Bobrovs, Vjaceslavs
    Riga Technical University, Latvia.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE Research Institutes of Sweden, Digitala system, Industriella system. KTH Royal Institute of Technology, Sweden; Riga Technical University, Latvia.
    Pang, Xiaodan
    RISE Research Institutes of Sweden, Digitala system, Industriella system. KTH Royal Institute of Technology, Sweden; Riga Technical University, Latvia.
    Experimental Validation of Coherent Joint Transmission in a Distributed-MIMO System with Analog Fronthaul for 6G2023Inngår i: 2023 Joint European Conference on Networks and Communications & 6G Summit (EuCNC/6G Summit), Institute of Electrical and Electronics Engineers (IEEE), 2023, s. 585-590Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The sixth-generation (6G) mobile networks must increase coverage and improve spectral efficiency, especially for cell-edge users. Distributed multiple-input multiple-output (D-MIMO) networks can fulfill these requirements provided that transmission/reception points (TRxPs) of the network can be synchronized with sub-nanosecond precision, however, synchronization with current backhaul and fronthaul digital interfaces is challenging. For 6G new services and scenarios, analog radio-over-fiber (ARoF) is a prospective alternative for future mobile fronthaul where current solutions fall short to fulfill future demands on bandwidth, synchronization, and/or power consumption. This paper presents an experimental validation of coherent joint transmissions (CJTs) in a two TRxPs D-MIMO network where ARoF fronthaul links allow to meet the required level of synchronization. Results show that by means of CJT a combined diversity and power gain of +5 dB is realized in comparison with a single TRxP transmission.

  • 50.
    Puerta, Rafael
    et al.
    Ericsson AB, Sweden; KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara. KTH Royal Institute of Technology, Sweden; Riga Technical University, Latvia.
    Djupsjöbacka, Anders
    KTH Royal Institute of Technology, Sweden.
    Bobrovs, V.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Pang, Xiaodan
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara. KTH Royal Institute of Technology, Sweden; Riga Technical University, Latvia.
    5G/NR Conformance Testing of Analog Radio-overfiber Fronthaul Links2022Inngår i: 2022 IEEE International Topical Meeting on Microwave Photonics, MWP 2022 - Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2022Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Foreseen requirements and use cases of future beyond fifth-generation (B5G) and sixth-generation (6G) mobile networks have shown that current mobile networks implementations must be reconsidered. Analog radio-over-fiber (ARoF) is a prospective solution for future mobile fronthaul of certain applications where current solutions fall short to fulfill future demands on bandwidth and power consumption. This paper provides a complete New-Radio (NR) conformance testing of ARoF fronthaul links in full accordance with the 3rd Generation Partnership Project (3GPP) technical specifications. We experimentally verified that the adjacent channel leakage power ratio (ACLR) and the error vector magnitude (EVM) transmitter requirements are fulfilled validating ARoF links as a suitable solution for next-generation mobile fronthaul. Wireless transmissions results are also provided.

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