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Publications (10 of 23) Show all publications
Pang, X., Ozolins, O., Navarro, J. R. G., Udalcovs, A., Kakkar, A., Lin, R., . . . Chen, J. (2018). Low-Complexity Digital Signal Processing Techniques to Enable Coherent Optical Systems for Metro and Access networks. In: 23RD OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC2018): . Paper presented at 23rd Opto-Electronics and Communications Conference (OECC), JUL 02-06, 2018, Jeju, SOUTH KOREA. IEEE
Open this publication in new window or tab >>Low-Complexity Digital Signal Processing Techniques to Enable Coherent Optical Systems for Metro and Access networks
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2018 (English)In: 23RD OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC2018), IEEE , 2018Conference paper, Published paper (Refereed)
Abstract [en]

We summarize our recent research works on enabling coherent optical transmission systems for metro and access networks with low-complexity digital signal processing techniques, focusing on reduction of laser linewidth requirement with efficient carrier phase recovery.

Place, publisher, year, edition, pages
IEEE, 2018
Series
Opto-Electronics and Communications Conference-OECC, ISSN 2166-8884
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-256298 (URN)10.1109/OECC.2018.8729864 (DOI)000477695500035 ()2-s2.0-85067996024 (Scopus ID)978-1-5386-9145-8 (ISBN)
Conference
23rd Opto-Electronics and Communications Conference (OECC), JUL 02-06, 2018, Jeju, SOUTH KOREA
Note

QC 20190917

Available from: 2019-09-17 Created: 2019-09-17 Last updated: 2019-09-17Bibliographically approved
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) Published
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 letter, 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. 

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2018
Keywords
Integrated optics, optical interconnections, optical polymers, Esters, Glass transition, Light polarization, Optical interconnects, Optical sensors, Optical waveguides, Polarization, Surface roughness, Waveguide components, Waveguides, Integrated polymers, Optical attenuators, Optical device fabrication, Optoelectronic industry, Polarization sensitivity, Polymer waveguides, Waveguide surfaces, Polymers
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-227403 (URN)10.1109/LPT.2018.2797685 (DOI)000429172600005 ()2-s2.0-85040999156 (Scopus ID)
Note

Export Date: 9 May 2018; Article; CODEN: IPTLE; Correspondence Address: Marinins, A.; School of Engineering Sciences, KTH Royal Institute of TechnologySweden; email: marinin@kth.se; Funding details: 608099; Funding details: SEAS, Harvard School of Engineering and Applied Sciences; Funding details: 324391; Funding details: 2016-04510; Funding details: Knut och Alice Wallenbergs Stiftelse; Funding details: KTH, Kungliga Tekniska Högskolan; Funding text: Manuscript received March 14, 2017; revised January 21, 2018; accepted January 22, 2018. Date of publication January 24, 2018; date of current version February 12, 2018. This work was supported in part by EU Project ICONE under Grant 608099, in part by the EU Project GRIFFON under Grant 324391, in part by the Swedish ICT-TNG Program, in part by the Vetenskapsrädet Project PHASE under Grant 2016-04510, and in part by the Knut and Alice Wallenberg Foundation. (Corresponding author: Aleksandrs Marinins.) A. Marinins, A. Kakkar, R. Schatz, and S. Popov are with the School of Engineering Sciences, KTH Royal Institute of Technology, 10044 Stockholm, Sweden (e-mail: marinin@kth.se; adityak@kth.se; rschatz@kth.se; sergeip@kth.se). QC 20180529

Available from: 2018-05-29 Created: 2018-05-29 Last updated: 2018-05-29Bibliographically approved
Ozolins, O., Pang, X., Udalcovs, A., Schatz, R., Westergren, U., Rodrigo Navarro, J., . . . Jacobsen, G. (2017). 100 Gbaud 4PAM Link for High Speed Optical Interconnects. In: 43RD EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC 2017): . Paper presented at Gothenburg; Sweden; 17 September 2017 through 21 September 2017. IEEE
Open this publication in new window or tab >>100 Gbaud 4PAM Link for High Speed Optical Interconnects
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2017 (English)In: 43RD EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC 2017), IEEE , 2017Conference 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.

Place, publisher, year, edition, pages
IEEE, 2017
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-231673 (URN)10.1109/ECOC.2017.8345960 (DOI)000434969300134 ()2-s2.0-85046964032 (Scopus ID)
Conference
Gothenburg; Sweden; 17 September 2017 through 21 September 2017
Note

QC 20180828

Available from: 2018-08-28 Created: 2018-08-28 Last updated: 2019-08-20Bibliographically approved
Ozolins, O., Pang, X., Iglesias Olmedo, M., 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
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. 1174-1179Article 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.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2017
Keywords
Direct detection, distributed feedback laser (DFB), electroabsorption modulator, optical interconnects
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-206702 (URN)10.1109/JLT.2017.2651947 (DOI)000399388500004 ()2-s2.0-85018964493 (Scopus ID)
Note

QC 20170509

Available from: 2017-05-09 Created: 2017-05-09 Last updated: 2018-09-19Bibliographically 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. Institute of Electrical and Electronics Engineers Inc.
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, Institute of Electrical and Electronics Engineers Inc. , 2017Conference 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.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2017
Keywords
Optical fibers, Aliasing, Linear equalization, Nyquist, Time domain, Transmission systems, Optical fiber communication
National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-216490 (URN)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: CSC, China Scholarship Council; Funding details: 61307090, 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; Funding details: 61671212, 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, Göran 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.

QC 20171201

Available from: 2017-12-01 Created: 2017-12-01 Last updated: 2017-12-01Bibliographically approved
Hong, X., Ozolins, O., Guo, C., Pang, X., Zhang, J., Navarro, J. R., . . . Chen, J. (2017). 1.55-mu m EML-based DMT Transmission with Nonlinearity-Aware Time Domain Super-Nyquist Image Induced Aliasing. In: 2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC): . Paper presented at Optical Fiber Communications Conference and Exhibition (OFC), MAR 19-23, 2017, Los Angeles, CA. IEEE
Open this publication in new window or tab >>1.55-mu m 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), IEEE , 2017Conference paper, Published paper (Refereed)
Abstract [en]

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

Place, publisher, year, edition, pages
IEEE, 2017
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-210951 (URN)000403405800245 ()978-1-943580-23-1 (ISBN)
Conference
Optical Fiber Communications Conference and Exhibition (OFC), MAR 19-23, 2017, Los Angeles, CA
Note

QC 20170713

Available from: 2017-07-13 Created: 2017-07-13 Last updated: 2017-07-13Bibliographically 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: 43RD EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC 2017): . Paper presented at ECOC 2017; Gothenburg; Sweden; 17 September 2017 through 21 September 2017. IEEE
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: 43RD EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC 2017), IEEE , 2017Conference paper, Published paper (Refereed)
Abstract [en]

We report on the first experimental demonstration of 200-Gbps (net rate 166.7-Gbps) 1.55-mu m 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.

Place, publisher, year, edition, pages
IEEE, 2017
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-231668 (URN)000434969300232 ()2-s2.0-85046949045 (Scopus ID)
Conference
ECOC 2017; Gothenburg; Sweden; 17 September 2017 through 21 September 2017
Note

QC 20180830

Available from: 2018-08-30 Created: 2018-08-30 Last updated: 2019-08-20Bibliographically 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: CLEO: Science and Innovations. Paper presented at CLEO - Conference on Lasers and Electro-Optics. OSA Publishing
Open this publication in new window or tab >>Cylindrical Polymer Optical Waveguides with Polarization Independent Performance
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2017 (English)In: CLEO: Science and Innovations, OSA Publishing , 2017Conference 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.

Place, publisher, year, edition, pages
OSA Publishing, 2017
National Category
Atom and Molecular Physics and Optics Communication Systems
Identifiers
urn:nbn:se:kth:diva-215617 (URN)10.1364/CLEO_SI.2017.SF1J.6 (DOI)000427296202029 ()2-s2.0-85020313986 (Scopus ID)
Conference
CLEO - Conference on Lasers and Electro-Optics
Note

QC 20171106

Available from: 2017-11-02 Created: 2017-11-02 Last updated: 2018-05-30Bibliographically approved
Pang, X., Ozolins, O., Gaiarin, S., Kakkar, A., Rodrigo Navarro, J., 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.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2017
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
Telecommunications
Identifiers
urn:nbn:se:kth:diva-208013 (URN)10.1109/LPT.2017.2662948 (DOI)000395996500012 ()2-s2.0-85015017150 (Scopus ID)
Note

QC 2017-06-08

Available from: 2017-06-08 Created: 2017-06-08 Last updated: 2019-01-30Bibliographically approved
Rodrigo Navarro, J., 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. Institute of Electrical and Electronics Engineers Inc.
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, Institute of Electrical and Electronics Engineers Inc. , 2017Conference 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.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2017
Keywords
Optical fibers, Quadrature amplitude modulation, Carrier phase recovery, Coherent optical systems, Complexity reduction, Optical fiber communication
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-216483 (URN)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

QC 20171212

Available from: 2017-12-12 Created: 2017-12-12 Last updated: 2017-12-12Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0001-8389-158X

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