Joint Equalization of Linear and Nonlinear Impairments for PAM4 Short-Reach Direct Detection Systems
Zhaopeng Xu, Chuanbowen Sun, Jonathan H Manton, William Shieh
IEEE PHOTONICS TECHNOLOGY LETTERS | IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC | Published : 2021
Various neural network (NN)-based equalizers have been proposed as effective digital signal processing (DSP) tools for short-reach optical direct detection (DD) communication systems. However, they are mainly designed for solving nonlinear problems due to the intrinsic nonlinear activation function. In this letter, we propose novel DSP schemes to deal with both linear and nonlinear impairments in short-reach DD optical links, including cascade feedforward NN (FNN)/cascade recurrent NN (RNN)-based equalizers, and combination of feedforward equalization (FFE) and traditional non-cascade FNN/RNN-based equalizers. A 50-Gb/s pulse amplitude modulation (PAM)-4 directly modulated laser (DML)-based ..View full abstract
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Awarded by Australian Research Council (ARC)
This work was supported by the Australian Research Council (ARC) through Discovery Projects under Grant DP150101864 and Grant DP190103724.