Abstract

We propose a 100-Gb/s/λ-based coherent wavelength division multiplexing passive optical network system with a hardware-efficient digital signal processing (DSP), which features a new adaptive equalization (AEQ) and carrier phase recovery (CPR). While a conventional AEQ consists of four finite impulse response (FIR) filters in a butterfly configuration, we propose to split the conventional AEQ into a 1-tap butterfly FIR filter and two nonbutterfly FIR filters to halve the number of long FIR filters, sacrificing compensation of differential group delay (DGD). To reduce the complexity of the CPR, we propose to replace the phase estimation of one of the two polarizations by the less computation-intensive estimation of the phase offset between the two polarizations, since the phase noises of the two polarizations are almost identical. With the proposed AEQ and CPR, the number of multiplications is reduced by 41% compared with more conventional cases. An 80-km downstream transmission experiment with 32 Gbaud dual-polarization quadrature phase-shift keying (DP-QPSK) signals and offline DSP showed that our proposed system achieved a loss budget of 40.7 dB capable of supporting 8 ONU splits over an 80-km single-mode fiber span. The tolerance to DGD is evaluated by numerical simulation, and the results revealed that the penalty from DGD was less than the margin obtained in the transmission experiment.

© 2017 IEEE

200 Gbit/s/λ PDM-PAM-4 PON system based on intensity modulation and coherent detection

Jiao Zhang, Jianjun Yu, Xinying Li, Kaihui Wang, Wen Zhou, Jiangnan Xiao, Li Zhao, Xiaolong Pan, Bo Liu, and Xiangjun Xin
J. Opt. Commun. Netw. 12(1) A1-A8 (2020)

PDL and CD insensitive low complexity equalizer for short reach coherent systems

Zhenming Yu, Yilun Zhao, Shaohua Hu, Zhiquan Wan, Liang Shu, Jing Zhang, and Kun Xu
Opt. Express 29(5) 6657-6667 (2021)

Joint estimation of dynamic polarization and carrier phase with pilot-based adaptive equalizer in PDM-64 QAM transmission system

Jiaqian Yang, Eric Sillekens, Wenting Yi, Polina Bayvel, and Robert I. Killey
Opt. Express 29(26) 43136-43147 (2021)

Low complexity joint clock recovery and adaptive equalization based on a baud-rate timing phase error detector for short-reach digital coherent transmission

Jingpeng Liu, Chengbo Li, Sheng Cui, Yanan Chen, Jianwei Tang, Jinhao Zhou, Keji Zhou, Jing Dai, and Ming Tang
Opt. Lett. 48(16) 4384-4387 (2023)

Feed-forward carrier phase recovery for offset-QAM Nyquist WDM transmission

Haoyuan Tang, Meng Xiang, Songnian Fu, Ming Tang, Perry Shum, and Deming Liu
Opt. Express 23(5) 6215-6227 (2015)