Adaptive Channel-Matched Detection for C-Band 64-Gbit/s Optical OOK System Over 100-km Dispersion-Uncompensated Link

In this paper, we propose adaptive channel-matched detection (ACMD) to effectively compensate channel distortions for C-band 64-Gbit/s intensity-modulation and direct-detection (IM/DD) optical on-off keying (OOK) system over a 100-km dispersion-uncompensated link. The proposed ACMD can adaptively compensate most of the link distortions based on channel and noise characteristics, which includes a polynomial nonlinear equalizer (PNLE), a decision feedback equalizer (DFE) and maximum likelihood sequence estimation (MLSE). Based on the channel characteristics, PNLE eliminates the linear and nonlinear distortions, while the followed DFE compensates the spectral nulls caused by chromatic dispersion. Finally, based on the noise characteristics, a post filter can whiten the noise for implementing optimal signal detection using MLSE. To the best of our knowledge, we present a record C-band 64-Gbit/s IM/DD optical OOK system over a 100 km dispersion-uncompensated link achieving 7% hard-decision forward error correction limit using only the proposed ACMD at the receiver side.

[1]  Werner Rosenkranz,et al.  Tomlinson–Harashima Precoding For Dispersion Uncompensated PAM-4 Transmission With Direct-Detection , 2017, Journal of Lightwave Technology.

[2]  Kevin Barraclough,et al.  I and i , 2001, BMJ : British Medical Journal.

[3]  Jianjun Yu,et al.  EML-based IM/DD 400G (4×112.5-Gbit/s) PAM-4 over 80 km SSMF based on linear pre-equalization and nonlinear LUT pre-distortion for inter-DCI applications , 2017, 2017 Optical Fiber Communications Conference and Exhibition (OFC).

[4]  Weisheng Hu,et al.  Experimental Study of NRZ, Duobinary, and PAM-4 in O-Band DML-Based 100G-EPON , 2017, IEEE Photonics Technology Letters.

[5]  A. Elrefaie,et al.  Chromatic dispersion limitations for FSK and DPSK systems with direct detection receivers , 1991, IEEE Photonics Technology Letters.

[6]  John G. Proakis,et al.  Digital Communications , 1983 .

[7]  Qixiang Cheng,et al.  Recent advances in optical technologies for data centers: a review , 2018, Optica.

[8]  Deming Liu,et al.  2 × 64 Gb/s PAM-4 transmission over 70 km SSMF using O-band 18G-class directly modulated lasers (DMLs). , 2017, Optics express.

[9]  Yuting Fan,et al.  64-Gb/s SSB-PAM4 Transmission Over 120-km Dispersion-Uncompensated SSMF With Blind Nonlinear Equalization, Adaptive Noise-Whitening Postfilter and MLSD , 2017, Journal of Lightwave Technology.

[10]  Chia-Chien Wei,et al.  224-Gbps transmission for next-generation WDM long-reach PON using CAP modulation , 2016, 2016 Optical Fiber Communications Conference and Exhibition (OFC).

[11]  Chao Lu,et al.  Digital Signal Processing for Short-Reach Optical Communications: A Review of Current Technologies and Future Trends , 2018, Journal of Lightwave Technology.

[12]  Fred Buchali,et al.  50 Gb/s PAM-4 Transmission Over 80-km SSMF Without Dispersion Compensation , 2018, 2018 European Conference on Optical Communication (ECOC).

[13]  Changyuan Yu,et al.  Optimization Algorithms of Neural Networks for Traditional Time-Domain Equalizer in Optical Communications , 2019, Applied Sciences.

[14]  Aaas News,et al.  Book Reviews , 1893, Buffalo Medical and Surgical Journal.

[15]  A. Mecozzi,et al.  Kramers–Kronig coherent receiver , 2016 .

[16]  Changyuan Yu,et al.  Adaptive moment estimation for polynomial nonlinear equalizer in PAM8-based optical interconnects. , 2019, Optics express.

[17]  Mengqi Guo,et al.  C-band 56-Gb/s PAM4 transmission over 80-km SSMF with electrical equalization at receiver. , 2019, Optics express.

[18]  Yanzhao Lu,et al.  Detection of 56GBaud PDM-QPSK generated by commercial CMOS DAC with 11GHz analog bandwidth , 2014, 2014 The European Conference on Optical Communication (ECOC).

[19]  John G. Proakis,et al.  Digital Signal Processing Using MATLAB: A Problem Solving Companion , 2016 .

[20]  S. Haykin.  Signal processing: where physics and mathematics meet , 2001, IEEE Signal Process. Mag..

[21]  Tomislav Drenski,et al.  80 km IM-DD transmission for 100 Gb/s per lane enabled by DMT and nonlinearity management , 2014, OFC 2014.

[22]  Talha Rahman,et al.  FEC overhead and fiber nonlinearity mitigation: Performance and power consumption tradeoffs , 2014, OFC 2014.

[23]  Zhaohui Li,et al.  BGD-based Adam algorithm for time-domain equalizer in PAM-based optical interconnects , 2019, Optics Letters.

[24]  Qiang Zhang,et al.  Single-lane 180  Gb/s DB-PAM-4-signal transmission over an 80  km DCF-free SSMF link. , 2017, Optics letters.

[25]  Qiang Zhang,et al.  C-band single wavelength 100-Gb/s IM-DD transmission over 80-km SMF without CD compensation using SSB-DMT , 2015, 2015 Optical Fiber Communications Conference and Exhibition (OFC).

[26]  Fred Buchali,et al.  IM/DD Beyond Bandwidth Limitation for Data Center Optical Interconnects , 2019, Journal of Lightwave Technology.

[27]  W. Marsden.  I and J , 2012 .

[28]  M. Eiselt,et al.  Evaluation of Real-Time 8 × 56.25 Gb/s (400G) PAM-4 for Inter-Data Center Application Over 80 km of SSMF at 1550 nm , 2017, Journal of Lightwave Technology.

[29]  Neil Genzlinger.  A. and Q , 2006 .

[30]  Werner Rosenkranz,et al.  Performance enhancement for duobinary modulation through nonlinear electrical equalization , 2005 .

[31]  Changyuan Yu,et al.  C-band 56  Gbit/s on/off keying system over a 100  km dispersion-uncompensated link using only receiver-side digital signal processing. , 2020, Optics letters.