An optical signal impairment equalizer based on a photonic integrated chip

Abstract

The present application relates to the field of optics and optical communication, and particularly relates to an optical signal impairment equalizer based on a photonic integrated chip. The optical signal impairment equalizer is based on a photonic integrated reservoir structure. In the input layer, the impaired optical signal enters the chip through a grating coupler and is evenly divided into 16 paths by a tree-shaped directional coupler. The alternating arrangement of nodes and delay waveguides forms a vortex-shaped signal path in the reservoir, causing optical signals with different delay amounts to interfere at the nodes and exchange information. In the readout layer, the weights are realized by optical modulators, and the voltage signal is used to control the optical modulators to realize weight training and learn the signal impairment characteristics by using a two-stage particle swarm algorithm, thereby realizing optical channel equalization. The tree-shaped directional coupler realizes optical signal beam combining, and the photodetector receives the equalized optical signal and outputs it in the form of an electrical signal. The present application uses a photonic integrated chip to further reduce the optical signal impairment equalization delay and improve the bandwidth.

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