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Publikationer (10 of 18) Visa alla publikationer
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
Öppna denna publikation i ny flik eller fönster >>Thermal reflow engineered cylindrical polymer waveguides for optical interconnects
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2018 (Engelska)Ingår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 30, nr 5, s. 447-450Artikel i tidskrift (Refereegranskat) 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 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

Nyckelord
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
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:ri:diva-33246 (URN)10.1109/LPT.2018.2797685 (DOI)2-s2.0-85040999156 (Scopus ID)
Tillgänglig från: 2018-02-13 Skapad: 2018-02-13 Senast uppdaterad: 2024-03-11Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>100 GHz Externally Modulated Laser for Optical Interconnects
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2017 (Engelska)Ingår i: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 35, nr 6, s. 1174-1179, artikel-id 7814142Artikel i tidskrift (Refereegranskat) 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.

Nyckelord
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
Nationell ämneskategori
Data- och informationsvetenskap
Identifikatorer
urn:nbn:se:ri:diva-31005 (URN)10.1109/JLT.2017.2651947 (DOI)2-s2.0-85018964493 (Scopus ID)
Tillgänglig från: 2017-09-01 Skapad: 2017-09-01 Senast uppdaterad: 2024-03-05Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>1.55-jnm EML-based DMT transmission with nonlinearity-aware time domain super-nyquist image induced aliasing
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2017 (Engelska)Ingår i: 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017 - Proceedings, 2017Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Nyckelord
Optical fibers, Aliasing, Linear equalization, Nyquist, Time domain, Transmission systems, Optical fiber communication
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:ri:diva-35386 (URN)10.1364/ofc.2017.th3d.3 (DOI)2-s2.0-85025827916 (Scopus ID)9781943580231 (ISBN)
Konferens
2017 Optical Fiber Communications Conference and Exhibition, OFC 2017, 19 March 2017 through 23 March 2017
Anmärkning

 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.

Tillgänglig från: 2018-10-22 Skapad: 2018-10-22 Senast uppdaterad: 2024-03-05Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>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 (Engelska)Ingår i: European Conference on Optical Communication, ECOC, 2017Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Nyckelord
C-bands, Electrical spectra, Experimental demonstrations, Monolithically integrated, Optical communication
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:ri:diva-34663 (URN)10.1109/ECOC.2017.8346058 (DOI)2-s2.0-85046949045 (Scopus ID)9781538656242 (ISBN)
Konferens
43rd European Conference on Optical Communication, ECOC 2017, 17 September 2017 through 21 September 2017
Anmärkning

 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;

Tillgänglig från: 2018-08-15 Skapad: 2018-08-15 Senast uppdaterad: 2024-03-05Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>Blind phase search with angular quantization noise mitigation for efficient carrier phase recovery
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2017 (Engelska)Ingår i: Photonics, ISSN 2304-6732, Vol. 4, nr 2, artikel-id 37Artikel i tidskrift (Refereegranskat) 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.

Nyckelord
Blind phase search (BPS), Carrier phase estimation (CPE), Carrier phase recovery (CPR), Coherent detection, Phase noise, Quadrature amplitude modulation (mQAM)
Nationell ämneskategori
Data- och informationsvetenskap
Identifikatorer
urn:nbn:se:ri:diva-32510 (URN)10.3390/photonics4020037 (DOI)2-s2.0-85029468731 (Scopus ID)
Tillgänglig från: 2017-11-08 Skapad: 2017-11-08 Senast uppdaterad: 2024-03-11Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>Cylindrical polymer optical waveguides with polarization independent performance
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2017 (Engelska)Ingår i: Optics InfoBase Conference Papers, 2017, artikel-id SF1J.6Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Nationell ämneskategori
Data- och informationsvetenskap
Identifikatorer
urn:nbn:se:ri:diva-31122 (URN)10.1364/CLEO_SI.2017.SF1J.6 (DOI)2-s2.0-85020313986 (Scopus ID)9781943580279 (ISBN)
Konferens
CLEO: Science and Innovations, CLEO_SI 2017, 14 May 2017 through 19 May 2017
Tillgänglig från: 2017-08-28 Skapad: 2017-08-28 Senast uppdaterad: 2024-03-06Bibliografiskt granskad
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).
Öppna denna publikation i ny flik eller fönster >>Cylindrical polymer optical waveguides with polarization independent performance
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2017 (Engelska)Ingår i: 2017 Conference on Lasers and Electro-Optics, CLEO 2017 - Proceedings, 2017, s. 1-2Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Nyckelord
Esters, Optical waveguides, Polarization, Surface roughness, Waveguides, Cylindrical shapes, Polarization independent, Polarization insensitivity, Polymer optical waveguide, Propagation loss, Glass transition
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:ri:diva-35379 (URN)2-s2.0-85044237446 (Scopus ID)9781943580279 (ISBN)
Konferens
2017 Conference on Lasers and Electro-Optics, CLEO 2017, 14 May 2017 through 19 May 2017
Tillgänglig från: 2018-10-22 Skapad: 2018-10-22 Senast uppdaterad: 2024-03-11Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>Experimental Study of 1.55-μ m EML-Based Optical IM/DD PAM-4/8 Short Reach Systems
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2017 (Engelska)Ingår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 29, nr 6, s. 523-526, artikel-id 7839925Artikel i tidskrift (Refereegranskat) 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.

Nyckelord
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
Nationell ämneskategori
Data- och informationsvetenskap
Identifikatorer
urn:nbn:se:ri:diva-29334 (URN)10.1109/LPT.2017.2662948 (DOI)2-s2.0-85015017150 (Scopus ID)
Tillgänglig från: 2017-05-08 Skapad: 2017-05-08 Senast uppdaterad: 2024-03-05Bibliografiskt granskad
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
Öppna denna publikation i ny flik eller fönster >>Gigabit free-space multi-level signal transmission with a mid-infrared quantum cascade laser operating at room temperature
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2017 (Engelska)Ingår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 42, nr 18, s. 3646-3649Artikel i tidskrift (Refereegranskat) 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.

Nyckelord
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
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
urn:nbn:se:ri:diva-31343 (URN)10.1364/OL.42.003646 (DOI)2-s2.0-85029524769 (Scopus ID)
Anmärkning

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.

Tillgänglig från: 2017-10-06 Skapad: 2017-10-06 Senast uppdaterad: 2024-03-11Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>High performance and low complexity carrier phase recovery schemes for 64-QAM coherent optical systems
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2017 (Engelska)Ingår i: 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017 - Proceedings, 2017Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Nyckelord
Optical fibers, Quadrature amplitude modulation, Carrier phase recovery, Coherent optical systems, Complexity reduction, Optical fiber communication
Nationell ämneskategori
Data- och informationsvetenskap
Identifikatorer
urn:nbn:se:ri:diva-32517 (URN)10.1364/OFC.2017.W2A.53 (DOI)2-s2.0-85025817745 (Scopus ID)9781943580231 (ISBN)
Konferens
2017 Optical Fiber Communications Conference and Exhibition, OFC 2017, 19 March 2017 through 23 March 2017
Anmärkning

INSPEC Accession Number: 16929520

Tillgänglig från: 2017-11-10 Skapad: 2017-11-10 Senast uppdaterad: 2024-03-11Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0001-8389-158X

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