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  • 1.
    Alcusa-Sáez, E. P.
    et al.
    ICMUV Departamento de Física Aplicada y Electromagnetismo, Spain.
    Díez, Antonio
    ICMUV Departamento de Física Aplicada y Electromagnetismo, Spain.
    Rivera-Pérez, E.
    ICMUV Departamento de Física Aplicada y Electromagnetismo, Spain.
    Margulis, Walter
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Norin, L.
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Andrés, M. V.
    ICMUV Departamento de Física Aplicada y Electromagnetismo, Spain.
    Acousto-optic interaction in polyimide coated optical fibers with flexural waves2017In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 25, no 15, p. 17167-17173Article in journal (Refereed)
    Abstract [en]

    Acousto-optic coupling in polyimide-coated single-mode optical fibers using flexural elastic waves is demonstrated. The effect of the polyimide coating on the acousto-optic interaction process is analyzed in detailed. Theoretical and experimental results are in good agreement. Although the elastic attenuation is significant, we show that acousto-optic coupling can be produced with a reasonably good efficiency. To our knowledge, it is the first experimental demonstration of acousto-optic coupling in optical fibers with robust protective coating.

  • 2. Brunetti, AC
    et al.
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Rottwitt, K
    Raman probes based on optically-poled double-clad fiber coupler2012In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 20, no 27Article in journal (Refereed)
    Abstract [en]

    Two fiber Raman probes are presented, one based on an optically-poled double-clad fiber the second based on an opticallypoled double-clad fiber coupler respectively. Optical poling of the core of the fiber allows for the generation of enough 532nm light to perform Raman spectroscopy of a sample of dimethyl sulfoxide (DMSO), when illuminating the waveguide with 1064nm laser light. The Raman signal is collected in the inner cladding, from which it is retrieved with either a bulk dichroic mirror or a double-clad fiber coupler. The coupler allows for a substantial reduction of the fiber spectral background signal conveyed to the spectrometer._x000D_ Full text_x000D_

  • 3.
    Camara, A.
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. Pontifícia Universidade Católica do Rio de Janeiro,Brazil.
    Tarasenko, O.
    RISE, Swedish ICT, Acreo.
    Margulis, W.
    RISE, Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Study of thermally poled fibers with a two-dimensional model2014In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 22, p. 17700-15Article in journal (Refereed)
    Abstract [en]

    A two-dimensional (2D) numerical model is implemented to describe the movement of ions under thermal poling for the specific case of optical fibers. Three types of cations are considered (representing Na+, Li + and H3O+) of different mobility values. A cross-sectional map of the carrier concentration is obtained as a function of time. The role of the various cations is investigated. The assumptions of the model are validated by comparing the predictions to experimental data of the time evolution of the nonlinearity induced. A variational analysis of poling parameters including temperature, poling voltage, sign of the bias potential and initial ionic concentrations is performed for a particular fiber geometry. The analysis allows identifying the impact of these parameters on the induced secondorder nonlinearity in poled fibers.

  • 4.
    Camara, Alexandre R.
    et al.
    Rio de Janeiro State University, Brazil; Pontifical Catholic University of Rio de Janeiro, Brazil.
    Pereira, Joao M. B.
    Pontifical Catholic University of Rio de Janeiro, Brazil.
    Tarasenko, Oleksandr
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Margulis, Walter
    RISE, Swedish ICT, Acreo, Fiber Optics. KTH Royal Institute of Technology, Sweden.
    Carvalho, Isabel C. S.
    Pontifical Catholic University of Rio de Janeiro, Brazil.
    Optical creation and erasure of the linear electrooptical effect in silica fiber2015In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 23, no 14, p. 18060-18069Article in journal (Refereed)
    Abstract [en]

    We study the creation and erasure of the linear electrooptical effect in silicate fibers by optical poling. Carriers are released by exposure to green light and displaced with simultaneous application of an internal dc field. The second order nonlinear coefficient induced grows with poling bias. The field recorded (~108 V/m) is comparable to that obtained through classical thermal poling of fibers. In the regime studied here, the second-order nonlinearity induced (~0.06 pm/V) is limited by the field applied during poling (1.2 × 108 V/m). Optical erasure with high-power green light alone is very efficient. The dynamics of the writing and erasing process is discussed, and the two dimensional (2D) field distribution across the fiber is simulated.

  • 5. Candiani, A
    et al.
    Konstantaki, M
    Margulis, W
    RISE, Swedish ICT, Acreo.
     Pissadakis, S
    A spectrally tunable microstructured optical fibre Bragg grating utilizing an infiltrated ferrofluid2010In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 18, no 24, p. 24654-Article in journal (Refereed)
  • 6. Chughtai, MN
    et al.
    Forzati, M
    RISE, Swedish ICT, Acreo.
    Mårtensson, J
    Rafique, D
    Influence of polarization state, baud rate PMD on non-linear impairments in WDM systems with mixed PM (D)QPSK OOK channels2012In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 20, no 7, p. 8155-60Article in journal (Refereed)
  • 7.
    Coppel, L.G.
    et al.
    RISE, Innventia.
    Neuman, M.
    Edström, P.
    Lateral light scattering in paper: MTF simulation and measurement2011In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, no 25, p. 25181-25187Article in journal (Refereed)
  • 8.
    Deniel, L.
    et al.
    CNRS Univ Paris-Sud, France.
    Gay, M.
    CNSR Univ Rennes, France.
    Pérez Galacho, D.
    CNRS Univ Paris-Sud, France; Universitat Politècnica de València, Spain.
    Baudot, C.
    ST Microelectronics, France.
    Bramerie, L.
    CNSR Univ Rennes, France.
    Ozolins, Oskars
    KTH Royal Institute of Technology, Sweden.
    Boeuf, F.
    ST Microelectronics, France.
    Vivien, L.
    CNRS Univ Paris-Sud, France.
    Peucheret, C.
    CNSR Univ Rennes, France.
    Marris-Morini, D.
    CNRS Univ Paris-Sud, France.
    DAC-less PAM-4 generation in the O-band using a silicon Mach-Zehnder modulator2019In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 27, no 7, p. 9740-9748Article in journal (Refereed)
    Abstract [en]

    We demonstrate 20-Gb/s 4-level pulse amplitude modulation (PAM-4) signal generation using a silicon Mach-Zehnder modulator (MZM) in the O-band. The modulator is driven by two independent binary streams, and the PAM-4 signal is thus generated directly on the chip, avoiding the use of power-hungry digital-to-analog converters (DACs). With optimized amplitude levels of the binary signals applied to the two arms of the MZM, a pre-forward error correction (FEC) bit-error rate (BER) as low as 7.6 × 10 −7 is obtained. In comparison with a commercially available LiNbO 3 modulator, the penalty is only 2 dB at the KP4 FEC threshold of 2.2 × 10 −4

  • 9. Deschout, H.
    et al.
    Hagman, Joel
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Fransson, S.
    Jonasson, J.
    Rudemo, M.
    Loren, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Straightforward FRAP for quantitative diffusion measurements with a laser scanning microscope2010In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 18, no 22, p. 22886-22905Article in journal (Refereed)
    Abstract [en]

    Confocal or multi-photon laser scanning microscopes are convenient tools to perform FRAP diffusion measurements. Despite its popularity, accurate FRAP remains often challenging since current methods are either limited to relatively large bleach regions or can be complicated for non-specialists. In order to bring reliable quantitative FRAP measurements to the broad community of laser scanning microscopy users, here we have revised FRAP theory and present a new pixel based FRAP method relying on the photo bleaching of rectangular regions of any size and aspect ratio. The method allows for fast and straightforward quantitative diffusion measurements due to a closed-form expression for the recovery process utilizing all available spatial and temporal data. After a detailed validation, its versatility is demonstrated by diffusion studies in heterogeneous biopolymer mixtures. © 2010 Optical Society of America.

  • 10.
    Etcheverry, Sebastian
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Russom, A.
    KTH Royal Institute of Technology, Sweden.
    Laurell, F.
    KTH Royal Institute of Technology, Sweden.
    Margulis, Walter
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Fluidic trapping and optical detection of microparticles with a functional optical fiber2017In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 25, no 26, p. 33657-33663Article in journal (Refereed)
    Abstract [en]

    A fiber probe is presented that traps single micro-sized particles and allows detection of their optical properties. The trapping mechanism used is based on fluid suction with a micro-structured optical fiber that has five holes along its cladding. Proof-of-principle experiments with a diluted solution of fluorescently labeled particles are performed. The fiber probe presented here may find various applications in life-science and environmental monitoring. ©

  • 11. Gustafsson, O
    et al.
    Karim, A
    Berggren, J
    Wang, Q
    RISE, Swedish ICT, Acreo.
    Reuterskiöld-Hedlund, C
    Ernerheim-Jokumsen, C
    Soldemo, M
    Weissenrieder, J
    Persson, S
    Almqvist, S
    Ekenberg, U
    Noharet, B
    Asplund, C
    Göthelid, M
    Andersson, J Y
    RISE, Swedish ICT, Viktoria.
    Hammar, M
    Photoluminescence photoresponse from InSb/InAs-based quantum dot structures2012In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 20, no 19, p. 21264-71Article in journal (Refereed)
  • 12.
    Jacobsen, G
    et al.
    RISE, Swedish ICT, Acreo.
    Xu, T
    Popov, S
    Li, J
    RISE, Swedish ICT, Acreo.
    Friberg, AT
    Zhang, Y
    RISE, Swedish ICT, Acreo.
    EEPN CD study for coherent optical nPSK nQAM systems with RF pilot based phase noise compensation2012In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 20, no 8, p. 8862-70Article in journal (Refereed)
  • 13.
    Jacobsen, G
    et al.
    RISE, Swedish ICT, Acreo.
    Xu, T
    Popov, S
    Li, J
    RISE, Swedish ICT, Acreo.
    Friberg, AT
    Zhang, Y
    RISE, Swedish ICT, Acreo.
    Receiver implemented RF pilot tone phase noise mitigation in coherent optical nPSK nQAM systems2011In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 19, no 15, p. 14487-94Article in journal (Refereed)
  • 14. Johansson, S
    et al.
    Bjurshagen, S
    Canalias, C
    Pasiskevicius, V
    Laurell, F
     Koch, R
    RISE, Swedish ICT, Acreo.
    An all solid-state UV source based on a frequency quadrupled, passively Q-switched 946 nm laser2007In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 15, no 2, p. 449-58Article in journal (Refereed)
  • 15. Junique, S
    et al.
    Wang, Q
    Almqvist, S
    Noharet, B
    Andersson, JY    
    RISE, Swedish ICT, Viktoria.
    Large-area, three-state, binary amplitude binary phase vertical-cavity multiple quantum well electroabsorption modulator2007In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 15, no 14, p. 8566-75Article in journal (Refereed)
  • 16.
    Kakkar, Aditya
    et al.
    RISE, Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Pang, Xiaodan
    RISE, Swedish ICT, Acreo.
    Navarro, Jaime Rodrigo
    RISE, Swedish ICT, Acreo.
    Louchet, Hadrien
    VPIphotonics GmbH, Germany.
    Ozolins, Oskars
    RISE, Swedish ICT, Acreo.
    Jacobsen, Gunnar
    RISE, Swedish ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Impact of local oscillator frequency noise on coherent optical systems with electronic dispersion compensation2015In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 23, no 9, p. 11221-11226Article in journal (Refereed)
    Abstract [en]

    A theoretical investigation of the equalization-enhanced phase noise (EEPN) and its mitigation is presented. We show with a frequency domain analysis that the EEPN results from the non-linear inter-mixing between the sidebands of the dispersed signal and the noise sidebands of the local oscillator. It is further shown and validated with system simulations that the transmission penalty is mainly due to the slow optical frequency fluctuations of the local oscillator. Hence, elimination of the frequency noise below a certain cut-off frequency significantly reduces the transmission penalty, even when frequency noise would otherwise cause an error floor. The required cut-off frequency increases linearly with the white frequency noise level and hence the linewidth of the local oscillator laser, but is virtually independent of the symbol rate and the accumulated dispersion.

  • 17.
    Lin, Rui
    et al.
    Huazhong University of Science and Technology, China; KTH Royal Institute of Technology, Sweden.
    Van Kerrebrouck, Joris
    Ghent University, Belgium.
    Pang, Xiaodan
    Ghent University, Belgium.
    Verplaetse, Michael
    KTH Royal Institute of Technology, Sweden; Ghent University, Belgium.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Zhang, Lu
    KTH Royal Institute of Technology, Sweden.
    Gan, Lin
    Huazhong University of Science and Technology, China.
    Tang, Ming
    Huazhong University of Science and Technology, China.
    Fu, Sognian
    Huazhong University of Science and Technology, China.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Liu, Deming
    Huazhong University of Science and Technology, China.
    Tong, Weijun
    YOFC Yangtze Optical Fiber and Cable, China.
    De Keulenaer, Timothy
    Ghent University, Belgium.
    Torfs, Gui
    Ghent University, Belgium.
    Bauwelinck, Johan
    Ghent University, Belgium.
    Yin, Xin
    Ghent University, Belgium.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Real-time 100 Gbps/lambda/core NRZ and EDB IM/DD transmission over multicore fiber for intra-datacenter communication networks2018In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 26, no 8, p. 10519-10526Article in journal (Refereed)
    Abstract [en]

    A BiCMOS chip-based real-time intensity modulation/direct detection spatial division multiplexing system is experimentally demonstrated for both optical interconnects. 100 Gbps/lambda/core electrical duobinary (EDB) transmission over 1 km 7-core multicore fiber (MCF) is carried out, achieving KP4 forward error correction (FEC) limit (BER < 2E-4). Using optical dispersion compensation, 7 x 100 Gbps/lambda/core transmission of both non-retunito-zero (NRZ) and EDB signals over 10 km MCF transmission is achieved with BER lower than 7% overhead hard-decision FEC limit (BER < 3.8E-3). The integrated low complexity transceiver IC and analog signal processing approach make such a system highly attractive for the high-speed intra-datacenter interconnects. (C) 2018 Optical Society of America under the terms oldie OSA open Access Publishing Agreement.

  • 18.
    Lu, Yang
    et al.
    Hangzhou Dianzi University, China.
    Agrell, Erik
    Chalmers University of Technology, Sweden.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Hong, Xuezhi
    South China Normal University, China .
    Lin, Rui
    KTH Royal Institute of Technology, Sweden.
    Cheng, Yuxin
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden ; South China Normal University, China .
    Multi-channel collision-free reception for optical interconnects2018In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 26, no 10, p. 13214-13222Article in journal (Refereed)
    Abstract [en]

    A multi-channel reception scheme that allows each node to receive an arbitrary set of wavelengths simultaneously (i.e., collision-free) is proposed for optical interconnects. The proposed scheme only needs to use a few receivers and fixed-wavelength filters that are designed based on error-control coding theory. Experiments with up to four channel collision-free reception units are carried out to demonstrate the feasibility of the proposed scheme.

  • 19.
    Magalhaes, Regina
    et al.
    University of Alcala, Spain.
    Garcia-Ruiz, Andres
    University of Alcala, Spain.
    Martins, Hugo
    University of Alcala, Spain.
    Pereira, Joao
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Margulis, Walter
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Martin-Lopez, Sonia
    University of Alcala, Spain.
    Gonzalez-Herraez, Miguel
    University of Alcala, Spain.
    Fiber-based distributed bolometry2019In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 27, no 4, p. 4317-4328Article in journal (Refereed)
    Abstract [en]

    Optical fibers are inherently designed to allow no interaction between the guided light and the surrounding optical radiation. Thus, very few optical fiber-based technologies exist in the field of optical radiation sensing. Accomplishing fully-distributed optical radiation sensing appears then as even more challenging since, on top of the lack of sensitivity explained above, we should add the need of addressing thousands of measurement points in a single, continuous optical cable. Nevertheless, it is clear that there exist a number of applications which could benefit from such a distributed sensing scheme, particularly if the sensitivity was sufficiently high to be able to measure correctly variations in optical radiation levels compatible with the earth surface. Distributed optical radiation sensing over large distances could be employed in applications such as Dynamic Line Rating (DLR), where it is known that solar radiation can be an important limiting factor in energy transmission through overhead power cables, and also in other applications such as thermo-solar energy. In this work, we present the proof-of-concept of the first distributed bolometer based on optical fiber technology and capable of detecting absolute changes of irradiance. The core idea of the system is the use of a special fiber coating with high emissivity (e.g., carbon coating or black paint). The high absorption of these coatings translates into a temperature change that can be read with sufficiently high sensitivity using phase-sensitive reflectometry. To demonstrate the concept, we interrogate distinct black-coated optical fibers using a chirped-pulse ÖOTDR, and we readily demonstrate the detection of light with resolutions in the order of 1% of the reference solar irradiance, offering a high-potential technology for integration in the aforementioned applications.

  • 20. Malmström, M
    et al.
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Tarasenko, O
    RISE, Swedish ICT, Acreo.
    Pasiskevicius, V
    Laurell, F
    Soliton generation from an actively mode-locked fiber laser incorporating an electro-optic fiber modulator2012In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 20, no 3, p. 2905-Article in journal (Refereed)
  • 21. Malmström, M
    et al.
    Tarasenko, O
    RISE, Swedish ICT, Acreo.
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Pulse selection at 1 MHz with electrooptic fiber switch2012In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 20, no 9, p. 9465-70Article in journal (Refereed)
  • 22. Malmström, M
    et al.
    Yu, Z
    RISE, Swedish ICT, Acreo.
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Tarasenko, O
    RISE, Swedish ICT, Acreo.
    Laurell, F
    All-fiber cavity dumping2009In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 17, no 20, p. 17596-602Article in journal (Refereed)
  • 23. Myren, N
    et al.
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Time evolution of frozen in-field during thermal poling of fused silica optical fibers with internal alloy electrodes2005In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 13, no 9, p. 3438-Article in journal (Refereed)
  • 24. Myren, N
    et al.
    Olsson, H
    RISE, Swedish ICT, Acreo.
    Norin, L
    RISE, Swedish ICT, Acreo.
    Sjödin, N
    Helander, P
    RISE, Swedish ICT, Acreo.
    Svennebrink, J
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Wide wedge-shaped depletion region in thermally poled fiber with alloy electrodes2004In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 12, no 25, p. 6093-Article in journal (Refereed)
  • 25. Neuman, M.
    et al.
    Coppel, L.G.
    RISE, Innventia.
    Edström, P.
    Point spreading in turbid media with anisotropic single scattering2011In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, no 3, p. 1915-1920Article in journal (Refereed)
  • 26.
    Norin, L
    et al.
    RISE, Swedish ICT, Acreo.
    Ye, C
    Bosund, M
    Söderlund, MJ
    Tervonen, A
    Honkanen, S
    Ytterbium-doped fibers fabricated with atomic layer deposition method2012In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 20, no 22, p. 25085-95Article in journal (Refereed)
  • 27. Olsson, B-E
    et al.
    Djupsjöbacka, A
    RISE, Swedish ICT, Acreo.
    Mårtensson, J
    RISE, Swedish ICT, Acreo.
    Alping, A
    112-Gbit/s RF-assisted dual carrier DP-16-QAM transmitter using optical phase modulator2011In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 19, no 26, p. 784-789Article in journal (Refereed)
  • 28.
    Pereira, Joao
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Camara, Alexandre
    Universidade do Estado do Rio de Janeiro, Brazil.
    Laurell, Fredrik
    KTH Royal Institute of Technology, Sweden.
    Tarasenko, Oleksander
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Margulis, Walter
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Linear electro-optical effect in silica fibers poled with ultraviolet lamp2019In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 27, no 10, p. 14893-14902Article in journal (Refereed)
    Abstract [en]

    A second-order nonlinearity was induced in silica fibers poled by exposure to ultraviolet (UV) radiation and simultaneous high voltage applied to internal electrodes. The UV light source was a tubular lamp with spectral peak at 254 nm. The highest second-order nonlinear coefficient measured through the linear electro-optic effect was 0.062 pm/V. The erasure of the recorded voltage with UV excitation was studied, and the stability of the poled fiber at a temperature exceeding ~400 K was investigated. By eliminating the use of a focused laser beam as excitation source, the technique enables poling many pieces of fiber in parallel.

  • 29. Rafique, D
    et al.
    Mussolin, M
    Forzati, M
    RISE, Swedish ICT, Acreo.
    Mårtensson, J
    RISE, Swedish ICT, Acreo.
    Chugtai, MN
    Ellis, AD
    Compensation of intra-channel nonlinear fibre impairments using simplified digital back-propagation algorithm2011In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 19, no 10, p. 9453-60Article in journal (Refereed)
  • 30. Rafique, D
    et al.
    Mussolin, M
    Mårtensson, J
    RISE, Swedish ICT, Acreo.
    Forzati, M
    RISE, Swedish ICT, Acreo.
    Fischer, JK
    Molle, L
    Nölle, M
    Schubert, C
    Ellis, AD
    Polarization multiplexed 16QAM transmission employing modified digital back-propagation2011In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 19, no 26, p. b805-10Article in journal (Refereed)
  • 31. Rugeland, P
    et al.
    Sterner, C
    RISE, Swedish ICT, Acreo.
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Visible light guidance in silica capillaries by antiresonant reflection2013In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 21, p. 29217-Article in journal (Refereed)
  • 32. Rugeland, P
    et al.
    Tarasenko, O
    RISE, Swedish ICT, Acreo.
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Nanosecond monolithic Mach-Zehnder fiber switch2012In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 20, no 28, p. 29309-Article in journal (Refereed)
  • 33.
    Rugeland, Patrik
    et al.
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Sterner, Carola
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Margulis, Walter
    RISE, Swedish ICT, Acreo, Fiber Optics.
    Visible light guidance in silica capillaries by antiresonant reflection2013In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 21, no 24, p. 29217-29222Article in journal (Refereed)
    Abstract [en]

    Hollow silica capillaries are examined as optical waveguides evaluating the antiresonant reflecting optical waveguide (ARROW) effect by sequentially reducing the wall thickness through etching and measuring the optical transmission. It is found that the periodicity of the transmission bands is proportional to the wall thickness and that the propagation loss is of the order of a few dB/m.

  • 34. Sudirman, A
    et al.
     Björk, G
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Reflectometry, ablation fluid retrieval with an optical fiber2010In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 18, no 1, p. 134-Article in journal (Refereed)
  • 35.
    Sudirman, A.
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Etcheverry, S.
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Stjernström, M.
    KTH Royal Institute of Technology, Sweden.
    Laurell, F.
    KTH Royal Institute of Technology, Sweden.
    Margulis, W.
    RISE, Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    A fiber optic system for detection collection of micrometer-size particles2014In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 22, no 19Article in journal (Refereed)
    Abstract [en]

    An optical fiber containing longitudinal holes adjacent to the core has been used to detect and collect fluorescent particles from a solution. Excitation light was launched through the fiber and fluorescence signal was guided back to a detector system. As a proof of principle, green and red fluorescent polystyrene beads were detected and selectively collected from a water solution containing a mixture of red and green fluorescent beads.

  • 36. Sudirman, A
    et al.
    Norin, L
    RISE, Swedish ICT, Acreo.
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Increased sensitivity in fiber-based spectroscopy using carbon-coated fiber2012In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 20, no 27, p. 28049-55Article in journal (Refereed)
  • 37. Tipsuwannakul, E
    et al.
    Chughtai, MN
    Forzati, M
    RISE, Swedish ICT, Acreo.
    Mårtensson, J
    RISE, Swedish ICT, Acreo.
    Andrekson, P
    Karlsson, M
    Influence of self-cross-phase modulation on 40 Gbaud dual polarization DQPSK/D8PSK signals in 10 Gbit/s OOK WDM systems2010In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 18, no 23, p. 24178-88Article in journal (Refereed)
  • 38.
    Vanin, E
    RISE, Swedish ICT, Acreo.
    Performance evaluation of intensity modulated optical OFDM system with digital basebdistortion2011In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 19, no 5, p. 4280-93Article in journal (Refereed)
  • 39. Vanin, E
    et al.
    Jacobsen, G
    RISE, Swedish ICT, Acreo.
    Analytical estimation of laser phase noise induced BER floor in coherent receiver with digital signal processing2010In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 18, no 5, p. 4246-59Article in journal (Refereed)
  • 40.
    Wang, Q
    et al.
    RISE, Swedish ICT, Acreo.
    Junique, S
    Agren, D
    Almqvist, S
    Noharet, B
    Arrays of vertical-cavity electroabsorption modulators for parallel signal processing",2005In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 13, no 9, p. 3323-30Article in journal (Refereed)
  • 41. Xu, T
    et al.
    Jacobsen, G
    RISE, Swedish ICT, Acreo.
    Popov, S
    Li, J
    RISE, Swedish ICT, Acreo.
    Friberg, AT
    Zhang, Y
    RISE, Swedish ICT, Acreo.
    Analytical estimation of phase noise influence in coherent transmission system with digital dispersion equalization2011In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 19, no 8, p. 7756-68Article in journal (Refereed)
  • 42. Xu, T
    et al.
    Jacobsen, G
    RISE, Swedish ICT, Acreo.
    Popov, S
    Li, J
    RISE, Swedish ICT, Acreo.
    Vanin, E
    RISE, Swedish ICT, Acreo.
    Wang, K
    Friberg, AT
    Zhang, Y
    RISE, Swedish ICT, Acreo.
    Chromatic dispersion compensation in coherent transmission system using digital filters2010In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 18, p. 16243-57Article in journal (Refereed)
  • 43.
    Yu, Z
    et al.
    RISE, Swedish ICT, Acreo.
    Malmström, M
    Sterner, C
    RISE, Swedish ICT, Acreo.
    Tarasenko, O
    RISE, Swedish ICT, Acreo.
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Fonjallaz, P-Y
    Dynamics of long-period gratings tuned with internal fiber electrodes2011In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 36, no 5Article in journal (Refereed)
  • 44.
    Yu, Z
    et al.
    RISE, Swedish ICT, Acreo.
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Tarasenko, O
    RISE, Swedish ICT, Acreo.
    Knape, H
    Fonjallaz, P-Y
    Nanosecond switching of fiber Bragg gratings2007In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 15, no 22, p. 14948-53Article in journal (Refereed)
  • 45.
    Yu, Z
    et al.
    RISE, Swedish ICT, Acreo.
     Tarasenko, O
    RISE, Swedish ICT, Acreo.
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Fonjallaz, P-Y
    Birefringence switching of Bragg gratings in fibers with internal electrodes2008In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 16, no 11, p. 8229-35Article in journal (Refereed)
  • 46. Zafra, S
    et al.
    Pang, X
    RISE, Swedish ICT, Acreo.
    Jacobsen, G
    RISE, Swedish ICT, Acreo.
    Popov, S
    Sergeyev, S
    Phase noise tolerance study in coherent optical circular QAM transmissions with Viterbi-Viterbi carrier phase estimation2014In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 22, no 25, p. 30585-Article in journal (Refereed)
  • 47.
    Zafra, Sebastian Ortega
    et al.
    RISE, Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Pang, Xiaodan
    RISE, Swedish ICT, Acreo.
    Jacobsen, Gunnar
    RISE, Swedish ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Sergeyev, Sergey
    Phase noise tolerance study in coherent optical circular QAM transmissions with Viterbi-Viterbi carrier phase estimation2014In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 22, no 25, p. 30579-30585Article in journal (Refereed)
    Abstract [en]

    We present a performance evaluation of a non-conventional approach to implement phase noise tolerant optical systems with multilevel modulation formats. The performance of normalized Viterbi-Viterbi carrier phase estimation (V-V CPE) is investigated in detail for circular m-level quadrature amplitude modulation (C-mQAM) signals. The intrinsic property of C-mQAM constellation points with a uniform phase separation allows a straightforward employment of V-V CPE without the need to adapt constellation. Compared with conventional feed-forward CPE for square QAM signals, the simulated results show an enhanced tolerance of linewidth symbol duration product (Delta vT(s)) at a low sensitivity penalty by using feed-forward CPE structure with C-mQAM. This scheme can be easily upgraded to higher order modulations without inducing considerable complexity.

  • 48.
    Zhang, Lu
    et al.
    Shanghai Jiao Tong University, China ; KTH Royal Institute of Technology, Sweden.
    Pang, Xiodan
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    Wosinska, Lena
    KTH Royal Institute of Technology, Sweden.
    Xiao, Shilin
    Shanghai Jiao Tong University, China.
    Hu, Weisheng
    Shanghai Jiao Tong University, China.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Digital mobile fronthaul employing differential pulse code modulation with suppressed quantization noise2017In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 25, no 25, p. 31921-31936Article in journal (Refereed)
    Abstract [en]

    A differential pulse code modulation (DPCM) based digital mobile fronthaul architecture is proposed and experimentally demonstrated. By using a linear predictor in the DPCM encoding process, the quantization noise can be effectively suppressed and a prediction gain of 7~8 dB can be obtained. Experimental validation is carried out with a 20 km 15-Gbaud/λ 4-level pulse amplitude modulation (PAM4) intensity modulation and direct detection system. The results verify the feasibility of supporting 163, 122, 98, 81 20-MHz 4, 16, 64, 256 QAM based antenna-carrier (AxC) containers with only 3, 4, 5, 6 quantization bits at a sampling rate of 30.72MSa/s in LTE-A environment. Further increasing the number of quantization bits to 8 and 9, 1024 quadrature amplitude modulation (1024 QAM) and 4096 QAM transmission can be realized with error vector magnitude (EVM) lower than 1% and 0.5%, respectively. The supported number of AxCs in the proposed DPCM-based fronthaul is increased and the EVM is greatly reduced compared to the common public radio interface (CPRI) based fronthaul that uses pulse code modulation. Besides, the DPCM-based fronthaul is also experimentally demonstrated to support universal filtered multicarrier signal that is one candidate waveform for the 5th generation mobile systems.

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