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Navarro, Jaime RodrigoORCID iD iconorcid.org/0000-0001-5730-9656
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Publications (10 of 28) Show all publications
Marinins, A., Ozolins, O., Pang, X., Udalcovs, A., Navarro, J. R., Kakkar, A., . . . Popov, S. (2018). Thermal reflow engineered cylindrical polymer waveguides for optical interconnects. IEEE Photonics Technology Letters, 30(5), 447-450
Open this publication in new window or tab >>Thermal reflow engineered cylindrical polymer waveguides for optical interconnects
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2018 (English)In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 30, no 5, p. 447-450Article in journal (Refereed) In press
Abstract [en]

Integrated polymer photonics brings low cost and high fabrication flexibility to optoelectronic industry. However, this platform needs to overcome several issues to be effective enough for practical applications. In this work, we experimentally demonstrate a decrease of propagation losses and polarization sensitivity of polymer waveguide-based devices as a result of thermal treatment. Heating of poly(methyl methacrylate) strip optical waveguides above the glass transition temperature initiates a waveguide surface reflow due to a decrease of the polymer viscosity and surface tension energy. This results in a decrease of surface roughness and shape change from rectangular to cylindrical. Thus, scattering losses and polarization sensitivity are minimized. IEEE

Keywords
Integrated optics, Optical attenuators, Optical device fabrication, Optical interconnections, Optical polarization, Optical polymers, Optical sensors, Optical waveguides, Esters, Glass transition, Light polarization, Optical interconnects, Polarization, Surface roughness, Waveguide components, Waveguides, Integrated polymers, Optoelectronic industry, Polarization sensitivity, Polymer waveguides, Waveguide surfaces, Polymers
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-33246 (URN)10.1109/LPT.2018.2797685 (DOI)2-s2.0-85040999156 (Scopus ID)
Available from: 2018-02-13 Created: 2018-02-13 Last updated: 2018-12-20Bibliographically approved
Udalcovs, A., Ozolins, O., Pang, X., Navarro, J. R., Lin, R., Levantesi, M., . . . Popov, S. (2018). Towards Coherent Detection in SDM-based Optical Access Networks. In: : . Paper presented at Progress In Electromagnetics Research Symposium Abstracts, Toyama, Japan, 1–4 August, 2018.
Open this publication in new window or tab >>Towards Coherent Detection in SDM-based Optical Access Networks
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2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

To tackle the continued increase in capacity demand in optical access, self-homodyne coherent detection (SHCD) is being considered as a candidate solution, utilizing a spatial division multiplexing (SDM) in a low-crosstalk multicore fiber (MCF) [1, 2] and high-order modulation formats such as quadrature phase-shift keying (QPSK), 16-levels quadrature amplitude modulation (16-QAM) or even 64-levels QAM (64-QAM) . The latest imposes strict requirements on both the performance of digital signal processing (DSP) and the spectral purity of the free running lasers [4–6]. Although a SHCD scheme relaxes the laser linewidth requirements, eliminates the need for a carrier frequency tracking, the necessity for a carrier phase estimation remains if high-order constellations are considered. The reasons for that are (1) residual phase noise in a system and (2) a closer location of the constellation points in the complex plane, which leads to a significantly lower phase noise tolerance as compared to QPSK or even 16-QAM signals . Therefore, it is of crucial importance to propose a low-complexity (and low-latency) phase estimation algorithms for these scenarios as well, especially because traditional algorithms cannot be directly employed for 64QAM. During this presentation,

first, we overview our recent activities on designing and experimental validation of a high-performance and a low-complexity DSP block, focusing on carrier phase recovery (CPR) suitable for circular and square m-QAM constellations. For more information about the efficient CPR schemes for m-QAM, we recommend the

OFC2017 and ACP2017 proceedings.

Second, after the efficient CPR scheme is explained, we provide an insight into a solution of SDM-based optical access network where self-homodyne coherent detection (SHCD) scheme with our novel low-complexity CPR is implemented for a 28-Gbaud 16-QAM and 64- QAM transmission in downstream links with a goal to improve their spectral efficiency and to increase a phase-noise tolerance, which paves the way towards higher cost-efficiency. The proposed architecture together with the experimental demonstration is given in

CLEO2018 conference proceedings

National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-37722 (URN)
Conference
Progress In Electromagnetics Research Symposium Abstracts, Toyama, Japan, 1–4 August, 2018
Available from: 2019-02-04 Created: 2019-02-04 Last updated: 2019-02-08Bibliographically approved
Ozolins, O., Pang, X., Udalcovs, A., Schatz, R., Westergren, U., Navarro, J. R., . . . Jacobsen, G. (2017). 100 Gbaud 4PAM Link for High Speed Optical Interconnects. In: : . Paper presented at 43rd European Conference on Optical Communication, ECOC 2017, 17 September 2017 through 21 September 2017.
Open this publication in new window or tab >>100 Gbaud 4PAM Link for High Speed Optical Interconnects
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2017 (English)Conference paper, Published paper (Refereed)
Abstract [en]

We demonstrate 100 Gbaud 4PAM transmission over 400 meters SMF with monolithically integrated 1550 nm DFB-TWEAM having 100 GHz 3-dB bandwidth with 2 dB ripple. We evaluate its capabilities to enable two lanes 400 GbE client-side links for optical interconnects. © 2017 IEEE.

Keywords
Optical interconnects, Pulse amplitude modulation, 100 GHz, 1550 nm, Client sides, High speed optical interconnects, Monolithically integrated, Two-lane, Optical communication
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34977 (URN)10.1109/ECOC.2017.8345960 (DOI)2-s2.0-85046964032 (Scopus ID)9781538656242 (ISBN)
Conference
43rd European Conference on Optical Communication, ECOC 2017, 17 September 2017 through 21 September 2017
Available from: 2018-08-28 Created: 2018-08-28 Last updated: 2018-08-28Bibliographically approved
Hong, X., Ozolins, O., Guo, C., Pang, X., Zhang, J., Navarro, J. R., . . . Chen, J. (2017). 1.55-jnm EML-based DMT transmission with nonlinearity-aware time domain super-nyquist image induced aliasing. In: 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017 - Proceedings: . Paper presented at 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017, 19 March 2017 through 23 March 2017.
Open this publication in new window or tab >>1.55-jnm EML-based DMT transmission with nonlinearity-aware time domain super-nyquist image induced aliasing
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2017 (English)In: 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017 - Proceedings, 2017Conference paper, Published paper (Refereed)
Abstract [en]

We experimentally demonstrate a DMT transmission system with 1.55-μm EML using nonlinearity-aware time domain super-Nyquist image induced aliasing. Compared with linear equalization, the capacity is improved by ∼16.8%(33.1%) with proposed method for 4(40) km transmission.

Keywords
Optical fibers, Aliasing, Linear equalization, Nyquist, Time domain, Transmission systems, Optical fiber communication
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-35386 (URN)10.1364/ofc.2017.th3d.3 (DOI)2-s2.0-85025827916 (Scopus ID)9781943580231 (ISBN)
Conference
2017 Optical Fiber Communications Conference and Exhibition, OFC 2017, 19 March 2017 through 23 March 2017
Note

 Funding details: VR, Vetenskapsrådet; Funding details: SSF, Stiftelsen för Strategisk Forskning; Funding details: CSC, China Scholarship Council; Funding details: Knut och Alice Wallenbergs Stiftelse; Funding details: 61671212, NSFC, National Natural Science Foundation of China; Funding details: 61550110240, NSFC, National Natural Science Foundation of China; Funding details: 61307090, NSFC, National Natural Science Foundation of China; Funding details: 61605047, NSFC, National Natural Science Foundation of China; Funding text: This work is supported by EIT Digital Royal Garden project, Swedish Research Council, Swedish Foundation for Strategic Research, G?ran Gustafsson Stiftelse, China Scholarship Council, and National Natural Science Foundation of China (# 61550110240, 61671212, 61605047, 61307090). The equipment was funded by Knut and Alice Wallenberg foundation.

Available from: 2018-10-22 Created: 2018-10-22 Last updated: 2019-08-14Bibliographically approved
Hong, X., Ozolins, O., Guo, C., Pang, X., Zhang, J., Navarro, J. R., . . . Chen, J. (2017). 1.55-μm EML-based DMT transmission with nonlinearity- aware time domain super-nyquist image induced aliasing. In: Optics InfoBase Conference Papers: . Paper presented at Optical Fiber Communication Conference, OFC 2017, 19 March 2017 through 23 March 2017. OSA - The Optical Society
Open this publication in new window or tab >>1.55-μm EML-based DMT transmission with nonlinearity- aware time domain super-nyquist image induced aliasing
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2017 (English)In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2017Conference paper, Published paper (Refereed)
Abstract [en]

We experimentally demonstrate a DMT transmission system with 1.55-μm EML using nonlinearity-aware time domain super-Nyquist image induced aliasing. Compared with linear equalization, the capacity is improved by ~16.8%(33.1%) with proposed method for 4(40) km transmission. © 2017 OSA.

Place, publisher, year, edition, pages
OSA - The Optical Society, 2017
Keywords
Optical communication, Optical fibers, Aliasing, Linear equalization, Nyquist, Time domain, Transmission systems, Optical fiber communication
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:ri:diva-38100 (URN)10.1364/OFC.2017.Th3D.3 (DOI)2-s2.0-85019889602 (Scopus ID)9781557528209 (ISBN)
Conference
Optical Fiber Communication Conference, OFC 2017, 19 March 2017 through 23 March 2017
Available from: 2019-03-08 Created: 2019-03-08 Last updated: 2019-03-13Bibliographically approved
Hong, X., Zhang, L., Pang, X., Ozolins, O., Udalcovs, A., Guo, C., . . . Chen, J. (2017). 200-Gbps DMT Transmission over 1.6-km SSMF with A Single EML/DAC/PD for Optical Interconnects at C-Band. In: European Conference on Optical Communication, ECOC: . Paper presented at 43rd European Conference on Optical Communication, ECOC 2017, 17 September 2017 through 21 September 2017.
Open this publication in new window or tab >>200-Gbps DMT Transmission over 1.6-km SSMF with A Single EML/DAC/PD for Optical Interconnects at C-Band
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2017 (English)In: European Conference on Optical Communication, ECOC, 2017Conference paper, Published paper (Refereed)
Abstract [en]

We report on the first experimental demonstration of 200-Gbps (net rate 166.7-Gbps) 1.55-μm DMT IMDD transmission over 1.6 km fiber using a single monolithically-integrated-EML, DAC and photodiode, achieving an effective electrical spectrum efficiency of 4.93 bit/s/Hz. © 2017 IEEE.

Keywords
C-bands, Electrical spectra, Experimental demonstrations, Monolithically integrated, Optical communication
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34663 (URN)10.1109/ECOC.2017.8346058 (DOI)2-s2.0-85046949045 (Scopus ID)9781538656242 (ISBN)
Conference
43rd European Conference on Optical Communication, ECOC 2017, 17 September 2017 through 21 September 2017
Note

 Funding details: VR, Vetenskapsrådet; Funding details: SSF, Stiftelsen för Strategisk Forskning; Funding details: CSC, China Scholarship Council; Funding details: Knut och Alice Wallenbergs Stiftelse; Funding details: 61671212, NSFC, National Natural Science Foundation of China; Funding details: 61550110240, NSFC, National Natural Science Foundation of China; Funding details: 61605047, NSFC, National Natural Science Foundation of China;

Available from: 2018-08-15 Created: 2018-08-15 Last updated: 2018-08-16Bibliographically approved
Navarro, J. R., Kakkar, A., Schatz, R., Pang, X., Ozolins, O., Udalcovs, A., . . . Jacobsen, G. (2017). Blind phase search with angular quantization noise mitigation for efficient carrier phase recovery. Photonics, 4(2), Article ID 37.
Open this publication in new window or tab >>Blind phase search with angular quantization noise mitigation for efficient carrier phase recovery
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2017 (English)In: Photonics, ISSN 2304-6732, Vol. 4, no 2, article id 37Article in journal (Refereed) Published
Abstract [en]

The inherent discrete phase search nature of the conventional blind phase search (C-BPS) algorithm is found to introduce angular quantization noise in its phase noise estimator. The angular quantization noise found in the C-BPS is shown to limit its achievable performance and its potential low complexity implementation. A novel filtered BPS algorithm (F-BPS) is proposed and demonstrated to mitigate this quantization noise by performing a low pass filter operation on the C-BPS phase noise estimator. The improved performance of the proposed F-BPS algorithm makes it possible to significantly reduce the number of necessary test phases to achieve the C-BPS performance, thereby allowing for a drastic reduction of its practical implementation complexity. The proposed F-BPS scheme performance is evaluated on a 28-Gbaud 16QAM and 64QAM both in simulations and experimentally. Results confirm a substantial improvement of the performance along with a significant reduction of its potential implementation complexity compared to that of the C-BPS.

Keywords
Blind phase search (BPS), Carrier phase estimation (CPE), Carrier phase recovery (CPR), Coherent detection, Phase noise, Quadrature amplitude modulation (mQAM)
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-32510 (URN)10.3390/photonics4020037 (DOI)2-s2.0-85029468731 (Scopus ID)
Available from: 2017-11-08 Created: 2017-11-08 Last updated: 2018-08-13Bibliographically approved
Marinins, A., Ozolins, O., Pang, X., Udalcovs, A., Navarro, J. R., Kakkar, A., . . . Popov, S. (2017). Cylindrical polymer optical waveguides with polarization independent performance. In: Optics InfoBase Conference Papers: . Paper presented at CLEO: Science and Innovations, CLEO_SI 2017, 14 May 2017 through 19 May 2017. , Article ID SF1J.6.
Open this publication in new window or tab >>Cylindrical polymer optical waveguides with polarization independent performance
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2017 (English)In: Optics InfoBase Conference Papers, 2017, article id SF1J.6Conference paper, Published paper (Refereed)
Abstract [en]

Heating of poly(methyl methacrylate) ridge optical waveguides slightly above glass transition temperature minimizes surface roughness and provides cylindrical shape. We experimentally demonstrate propagation loss decrease and polarization insensitivity as a result of waveguide thermal treatment.

National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-31122 (URN)10.1364/CLEO_SI.2017.SF1J.6 (DOI)2-s2.0-85020313986 (Scopus ID)9781943580279 (ISBN)
Conference
CLEO: Science and Innovations, CLEO_SI 2017, 14 May 2017 through 19 May 2017
Available from: 2017-08-28 Created: 2017-08-28 Last updated: 2018-08-16Bibliographically approved
Marinins, A., Ozolins, O., Pang, X., Udalcovs, A., Navarro, J. R., Kakkar, A., . . . Popov, S. (2017). Cylindrical polymer optical waveguides with polarization independent performance. In: 2017 Conference on Lasers and Electro-Optics, CLEO 2017 - Proceedings: . Paper presented at 2017 Conference on Lasers and Electro-Optics, CLEO 2017, 14 May 2017 through 19 May 2017 (pp. 1-2).
Open this publication in new window or tab >>Cylindrical polymer optical waveguides with polarization independent performance
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2017 (English)In: 2017 Conference on Lasers and Electro-Optics, CLEO 2017 - Proceedings, 2017, p. 1-2Conference paper, Published paper (Refereed)
Abstract [en]

Heating of poly(methyl methacrylate) ridge optical waveguides slightly above glass transition temperature minimizes surface roughness and provides cylindrical shape. We experimentally demonstrate propagation loss decrease and polarization insensitivity as a result of waveguide thermal treatment.

Keywords
Esters, Optical waveguides, Polarization, Surface roughness, Waveguides, Cylindrical shapes, Polarization independent, Polarization insensitivity, Polymer optical waveguide, Propagation loss, Glass transition
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-35379 (URN)2-s2.0-85044237446 (Scopus ID)9781943580279 (ISBN)
Conference
2017 Conference on Lasers and Electro-Optics, CLEO 2017, 14 May 2017 through 19 May 2017
Available from: 2018-10-22 Created: 2018-10-22 Last updated: 2018-10-29Bibliographically approved
Pang, X., Ozolins, O., Gaiarin, S., Kakkar, A., Navarro, J. R., Iglesias Olmedo, M., . . . Jacobsen, G. (2017). Experimental Study of 1.55-μ m EML-Based Optical IM/DD PAM-4/8 Short Reach Systems. IEEE Photonics Technology Letters, 29(6), 523-526, Article ID 7839925.
Open this publication in new window or tab >>Experimental Study of 1.55-μ m EML-Based Optical IM/DD PAM-4/8 Short Reach Systems
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2017 (English)In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 29, no 6, p. 523-526, article id 7839925Article in journal (Refereed) Published
Abstract [en]

We experimentally evaluate high-speed intensity modulation/direct detection (IM/DD) transmissions with a 1.55-μ text broadband electro-Absorption modulated laser and pulse amplitude modulations (PAM). We demonstrate 80 Gb/s/ λ PAM-4 and 96 Gb/s/ λ PAM-8 transmissions with low-complexity digital equalizers at the receiver. Performance comparison with different types of equalizers are performed, including linear symbol-spaced feed-forward equalizer (FFE), fractional (half-symbol) spaced FFE and decision feedback equalizer (DFE), with different tap number. It is found that for both cases, a 6-Tap symbol-spaced FFE is sufficient to achieve a stable performance with bit-error-rate below the 7% overhead hard decision forward error correction (7%-OH HD-FEC) threshold over a 4 km standard single mode fiber link. Practical considerations including comparison between adaptive and static equalizer implementation and tolerable fiber chromatic dispersion are discussed.

Keywords
direct detection, equalizers, optical modulation, Pulse amplitude modulation, Adaptive optics, Amplitude modulation, Bit error rate, Chromatic dispersion, Data communication systems, Decision feedback equalizers, Digital television, Error correction, Light modulation, Modulation, Optical communication, Radio communication, Single mode fibers, Electro-absorption modulated laser, Feedforward equalizer, Fiber chromatic dispersion, Intensity-modulation/direct-detection (IM/DD), Performance comparison, Pulse amplitude modulations (PAM), Standard single mode fibers
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-29334 (URN)10.1109/LPT.2017.2662948 (DOI)2-s2.0-85015017150 (Scopus ID)
Available from: 2017-05-08 Created: 2017-05-08 Last updated: 2018-12-20Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-5730-9656

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