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Publications (10 of 17) 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
Ozolins, O., Pang, X., Olmedo, M. I., Kakkar, A., Udalcovs, A., Gaiarin, S., . . . Jacobsen, G. (2017). 100 GHz Externally Modulated Laser for Optical Interconnects. Journal of Lightwave Technology, 35(6), 1174-1179, Article ID 7814142.
Open this publication in new window or tab >>100 GHz Externally Modulated Laser for Optical Interconnects
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2017 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 35, no 6, p. 1174-1179, article id 7814142Article in journal (Refereed) Published
Abstract [en]

We report on a 116 Gb/s on-off keying (OOK), four pulse amplitude modulation (PAM) and 105-Gb/s 8-PAM optical transmitter using an InP-based integrated and packaged externally modulated laser for high-speed optical interconnects with up to 30 dB static extinction ratio and over 100-GHz 3-dB bandwidth with 2 dB ripple. In addition, we study the tradeoff between power penalty and equalizer length to foresee transmission distances with standard single mode fiber.

Keywords
Direct detection, distributed feedback laser (DFB), electroabsorption modulator, optical interconnects, Distributed feedback lasers, Electroabsorption modulators, Optical communication, Externally modulated lasers, Extinction ratios, High speed optical interconnects, Power penalty, Pulse amplitude modulations (PAM), Standard single mode fibers, Transmission distances, Single mode fibers
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-31005 (URN)10.1109/JLT.2017.2651947 (DOI)2-s2.0-85018964493 (Scopus ID)
Available from: 2017-09-01 Created: 2017-09-01 Last updated: 2019-02-05Bibliographically 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., 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
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
Pang, X., Ozolins, O., Schatz, R., Storck, J., Udalcovs, A., Navarro, J. R., . . . Lourdudoss, S. (2017). Gigabit free-space multi-level signal transmission with a mid-infrared quantum cascade laser operating at room temperature. Optics Letters, 42(18), 3646-3649
Open this publication in new window or tab >>Gigabit free-space multi-level signal transmission with a mid-infrared quantum cascade laser operating at room temperature
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2017 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 42, no 18, p. 3646-3649Article in journal (Refereed) Published
Abstract [en]

Gigabit free-space transmissions are experimentally demonstrated with a quantum cascaded laser (QCL) emitting at mid-wavelength infrared of 4.65 μm, and a commercial infrared photovoltaic detector. The QCL operating at room temperature is directly modulated using on–off keying and, for the first time, to the best of our knowledge, four- and eight-level pulse amplitude modulations (PAM-4, PAM-8). By applying pre- and post-digital equalizations, we achieve up to 3 Gbit/s line data rate in all three modulation configurations with a bit error rate performance of below the 7% overhead hard decision forward error correction limit of 3.8 × 10−3. The proposed transmission link also shows a stable operational performance in the lab environment.

Keywords
Bit error rate, Error correction, Infrared radiation, Modulation, Optical communication, Quantum cascade lasers, Bit error rate (BER) performance, Digital equalization, Free-space transmission, Infrared photovoltaic, Mid-infrared quantum cascade, Mid-wavelength infrared, Operational performance, Quantum-cascaded lasers, Pulse amplitude modulation
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:ri:diva-31343 (URN)10.1364/OL.42.003646 (DOI)2-s2.0-85029524769 (Scopus ID)
Note

Funding details: 2015-05470, VR, Vetenskapsrådet;

Funding details: 2016-04510, VR, Vetenskapsrådet;

Funding details: 608099, PEOPLE, FP7 People: Marie-Curie Actions;

Funding details: Knut och Alice Wallenbergs Stiftelse;

Funding text: Vetenskapsrådet (VR) (2015-05470, 2016-04510, Linné Excellence Center ADOPT); FP7 People: Marie-Curie Actions (PEOPLE) (608099); Knut och Alice Wallenbergs Stiftelse.

Available from: 2017-10-06 Created: 2017-10-06 Last updated: 2018-08-16Bibliographically approved
Navarro, J. R., Kakkar, A., Schatz, R., Pang, X., Ozolins, O., Nordwall, F., . . . Jacobsen, G. (2017). High performance and low complexity carrier phase recovery schemes for 64-QAM coherent optical systems. 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 >>High performance and low complexity carrier phase recovery schemes for 64-QAM coherent optical systems
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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 validate two novel CPR schemes outperforming existing CPRs in complexity and performance. A complexity reduction of at least a factor of 4 is reported compared to the BPS algorithm for a 64QAM system.

Keywords
Optical fibers, Quadrature amplitude modulation, Carrier phase recovery, Coherent optical systems, Complexity reduction, Optical fiber communication
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-32517 (URN)10.1364/OFC.2017.W2A.53 (DOI)2-s2.0-85025817745 (Scopus ID)9781943580231 (ISBN)
Conference
2017 Optical Fiber Communications Conference and Exhibition, OFC 2017, 19 March 2017 through 23 March 2017
Note

INSPEC Accession Number: 16929520

Available from: 2017-11-10 Created: 2017-11-10 Last updated: 2019-03-07Bibliographically approved
Kakkar, A., Navarro, J. R., Schatz, R., Pang, X., Ozolins, O., Nordwall, F., . . . Popov, S. (2017). Influence of lasers with non-white frequency noise on the design of coherent optical links. 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 >>Influence of lasers with non-white frequency noise on the design of coherent optical links
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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 for a 28 Gbaud 64-QAM metro link that the LO frequency noise causes timing impairment. Results show the existence of LO frequency noise spectrum regimes where different design criteria apply.

Keywords
Optical fibers, Optical links, Coherent optical links, Design criteria, Frequency noise, LO frequency, Optical fiber communication
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-35385 (URN)2-s2.0-85025835093 (Scopus ID)9781943580231 (ISBN)
Conference
2017 Optical Fiber Communications Conference and Exhibition, OFC 2017, 19 March 2017 through 23 March 2017
Available from: 2018-10-22 Created: 2018-10-22 Last updated: 2018-10-29Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-8389-158x

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