| 1. |
- Olmedo, Miguel Iglesias, et al.
(författare)
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Carrier recovery techniques for semiconductor laser frequency noise for 28 Gbd DP-16QAM
- 2015
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Ingår i: Optical Fiber Communication Conference, OFC 2015. - Washington, D.C. : IEEE. - 9781557529374
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Konferensbidrag (refereegranskat)abstract
- We report on the first experimental comparison of DD-PLL, two-stage feed forward, and two variations of extended Kalman filtering for tracking semiconductor laser frequency noise. We identify which carrier phase recovery technique works best depending on the carrier induced frequency noise profile.
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| 2. |
- Ozolins, Oskars, et al.
(författare)
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100 GHz EML for high speed optical interconnect applications
- 2016
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Ingår i: European Conference on Optical Communication (ECOC). - : Institute of Electrical and Electronics Engineers Inc.. - 9783800742745 ; , s. 127-129
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Konferensbidrag (refereegranskat)abstract
- We report on a 116 Gbit/s OOK, 4PAM and 105 Gbit/s 8PAM optical transmitter using InP-based integrated EML for interconnect applications with up to 30 dB static extinction ratio and over 100 GHz 3 dB bandwidth with 2 dB ripple.
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| 3. |
- Ozolins, Oskars, et al.
(författare)
-
100 GHz Externally Modulated Laser for Optical Interconnects
- 2017
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Ingår i: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8724 .- 1558-2213. ; 35:6, s. 1174-1179
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 4. |
- Ozolins, O, et al.
(författare)
-
High-speed optical interconnects with integrated externally modulated laser
- 2017
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Ingår i: Transparent Optical Networks (ICTON), 2017 19th International Conference on. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781538608593 ; , s. 1-1
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Konferensbidrag (refereegranskat)abstract
- The cloud services together with the huge size datasets are driving demand for bandwidth in datacenters [1]. The 400 Gbps client-side links are demanding cost efficient solution: to reduce the number of lanes and increase the bandwidth for a single lane. The intensity modulation and direct-detection systems together with integrated semiconductor lasers and modulators appear as promising solution in four optical lanes at 100G since it reduces complexity, power consumption and costs [2]. However, it requires silicon and InP opto-electronic components with more than 70 GHz bandwidth [3]. In this talk, we report on a cost-efficient integrated externally modulated laser (EML) with high bandwidth for record high-speed intensity modulation and direct detection system demonstration with up to 100G OOK, PAM4/8 and duobinary signaling, as well as analog modulations e.g. DMT, paving the way for high speed multilevel modulation formats [4–6]. Related techniques including digital signal processing algorithms for timing recovery, adaptive/static equalization are also discussed in terms of practical implementation and complexity. In addition, techniques constructively using time domain super-Nyquist image induced aliasing for mitigating modulator driver nonlinearity for high speed DMT transmission will be presented [6], [7].
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| 5. |
- Pang, Xiaodan, et al.
(författare)
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Experimental Study of 1.55-μ m EML-Based Optical IM/DD PAM-4/8 Short Reach Systems
- 2017
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Ingår i: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers Inc.. - 1041-1135 .- 1941-0174. ; 29:6, s. 523-526
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 6. |
- Piels, M., et al.
(författare)
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Rate equation-based phase recovery for semiconductor laser coherent transmitters
- 2015
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Ingår i: Optical Fiber Communication Conference, OFC 2015. - Washington, D.C. : OSA - The Optical Society. - 9781557529374
-
Konferensbidrag (refereegranskat)abstract
- We present a novel carrier recovery technique for coherent systems with semiconductor lasers that incorporates the laser dynamics. A sensitivity improvement of 8dB over a decisiondirected phase-locked loop is achieved experimentally for 28GBd DP-16QAM.
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