High-Capacity IM-DD Transmission in O-Band Using Advanced Maximum Likelihood Sequence Estimation Methods

We propose advanced maximum likelihood sequence estimation (MLSE) methods for increasing the capacity of short-reach intensity-modulated direct detection (IM-DD) transmissions for economically realizing next generation Ethernet such as 800 GbE or 1.6 TbE. It is particularly important to conquer the traffic growth in data center networks, which has become a major issue. In this article, we introduce a method for reducing the complexity of the Viterbi algorithm, which is a problem in the actual implementation of MLSE, by using a penalty-less truncated trellis diagram with temporal decision results. Next, we introduce a method for improving the demodulation performance by precisely emulating the nonlinear response of the transmission system with low-cost devices using a nonlinear filter. Finally, we introduce a method for reducing the computational complexity with a decision feedback function. Transmission experiments in the O-band with transmission rates of 200 Gbps/lane or higher using each of the proposed methods are also presented. Finally, we present a 200 Gbps/lane 4-LAN-WDM 800 G 2 km transmission experiment using a 4-channel LAN-WDM TOSA designed for 400 G transmission.

[1]  Y. Kisaka,et al.  Advanced O-band transmission using maximum likelihood sequence estimation , 2022, 2022 European Conference on Optical Communication (ECOC).

[2]  G. Berry,et al.  A Low Chirp Electroabsorption Modulated Laser suitable for 200Gb/s PAM4 CWDM Transmission over 2km , 2022, 2022 European Conference on Optical Communication (ECOC).

[3]  C. Kottke,et al.  200 Gb/s Uncooled EML with Single MQW Layer Stack Design , 2022, 2022 European Conference on Optical Communication (ECOC).

[4]  Y. Kisaka,et al.  Evaluation of NGMI in 128-Gbuad PAM4 O-Band 10-km Transmission Using MLSE Based on Nonlinear Channel Estimation and Decision Feedback , 2022, 2022 European Conference on Optical Communication (ECOC).

[5]  R. Schatz,et al.  200 Gb/s Unamplified IM/DD Transmission over 20-km SMF with an O-band Low-Chirp Directly Modulated Laser , 2022, 2022 European Conference on Optical Communication (ECOC).

[6]  O. Dosunmu,et al.  200Gb/s per lane Ge/Si waveguide avalanche photodiode , 2022, 2022 European Conference on Optical Communication (ECOC).

[7]  J. Leuthold,et al.  Ultrahigh-Net-Bitrate 363 Gbit/s PAM-8 and 279 Gbit/s Polybinary Optical Transmission Using Plasmonic Mach-Zehnder Modulator , 2022, Journal of Lightwave Technology.

[8]  M. Kuschnerov,et al.  Partial Response O-band EML Transmission Beyond 300-GBd with a 128/256 GSa/s DAC , 2022, 2022 Optical Fiber Communications Conference and Exhibition (OFC).

[9]  Y. Kisaka,et al.  O-Band 10-km PAM Transmission Using Nonlinear-Spectrum-Shaping Encoder and Transition-Likelihood-Based Decoder with Symbol- and Likelihood-Domain Feedbacks , 2021, 2021 European Conference on Optical Communication (ECOC).

[10]  Nobuhiko Kikuchi,et al.  Application of Generalized THP for Arbitrary PAM Level Design in Short-Reach IM/DD Signalling , 2021, 2021 European Conference on Optical Communication (ECOC).

[11]  S. Kanazawa,et al.  800-Gbps PAM-4 O-band Transmission through 2-km SMF using 4λ LAN-WDM TOSA with MLSE Based on Nonlinear Channel Estimation and Decision Feedback , 2021, 2021 European Conference on Optical Communication (ECOC).

[12]  S. Calabrò,et al.  Transmission Beyond 200 Gbit/s With IM/DD System for Campus and Intra-Datacenter Network Applications , 2021, IEEE Photonics Technology Letters.

[13]  Y. Kisaka,et al.  Nonlinear Differential Coding for Spectral Shaping of PAM Signal in High-Baudrate Short-Reach Optical Transmission , 2021, Journal of Lightwave Technology.

[14]  Tianwai Bo,et al.  Reduced-state MLSE for an IM/DD system using PAM modulation. , 2020, Optics express.

[15]  Y. Kisaka,et al.  255-Gbps PAM-8 O-band Transmission through 10-km SMF under 14-GHz Bandwidth Limitation Using MLSE Based on Nonlinear Channel Estimation with Cutdown Volterra Kernels , 2020, 2020 European Conference on Optical Communications (ECOC).

[16]  G. Raybon,et al.  Single-Wavelength and Single-Photodiode 700 Gb/s Entropy-Loaded PS-256-QAM and 200-GBaud PS-PAM-16 Transmission over 10-km SMF , 2020, 2020 European Conference on Optical Communications (ECOC).

[17]  S. Kanazawa,et al.  225-Gbps/λ PAM-8 Transmission over 2-km using 4-λ LAN-WDM TOSA with MLSE Based on Nonlinear Channel Estimation , 2020, 2020 Opto-Electronics and Communications Conference (OECC).

[18]  Guanpeng Li,et al.  Demonstration of 214Gbps Per Lane IM/DD PAM-4 Transmission using O-Band 35GHz-Class EML with Advanced MLSE and KP4-FEC , 2020, 2020 Optical Fiber Communications Conference and Exhibition (OFC).

[19]  Shuto Yamamoto,et al.  84-GBaud/λ PAM-4 Transmission over 20-km using 4-λ LAN-WDM TOSA and ROSA with MLSE Based on Nonlinear Channel Estimation , 2020, 2020 Optical Fiber Communications Conference and Exhibition (OFC).

[20]  Kimikazu Sano,et al.  High Output Power and Compact LAN-WDM EADFB Laser TOSA for 4 × 100-Gbit/s/λ 40-km Fiber-Amplifier-Less Transmission , 2020, 2020 Optical Fiber Communications Conference and Exhibition (OFC).

[21]  Kisaka Yoshiaki,et al.  255-Gb/s PAM8 O-band Transmission through 10-km SMF using simplified MLSE based on Trellis-path Limitation , 2020 .

[22]  T. Hashimoto,et al.  Net-400-Gbps PS-PAM transmission using integrated AMUX-MZM. , 2019, Optics express.

[23]  Shuto Yamamoto,et al.  O-band Transmission of 255-Gb/s PAM8 Signal through 10-km SMF Using MLSE Based on Nonlinear Channel Estimation , 2019, 2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC).

[24]  Akira Masuda,et al.  255-Gbps PAM-8 Transmission under 20-GHz Bandwidth Limitation using NL-MLSE Based on Volterra Filter , 2019, 2019 Optical Fiber Communications Conference and Exhibition (OFC).

[25]  Mitsunori Fukutoku,et al.  96-Gbaud PAM-4 Transmission with 1 sample/symbol under 22-GHz Bandwidth Limitation Using NL-MLSE Based on Third-Order Volterra Filter , 2018, 2018 European Conference on Optical Communication (ECOC).

[26]  Mitsunori Fukutoku,et al.  Achievement of 186-Gb/s PAM-4 under 20.5-GHz bandwidth limitation using MLSE based on 2nd order Volterra filter , 2018, 2018 23rd Opto-Electronics and Communications Conference (OECC).

[27]  Mitsunori Fukutoku,et al.  Achievement of 90-Gbaud PAM-4 with MLSE Based on 2nd Order Volterra Filter and 2.88-Tb/s O-band Transmission Using 4-λ LAN-WDM and 4-Core Fiber SDM , 2018, 2018 Optical Fiber Communications Conference and Exposition (OFC).

[28]  Henning Bulow,et al.  High data rate Tomlinson-Harashima precoding-based PAM transmission , 2019, 45th European Conference on Optical Communication (ECOC 2019).