Simulation Framework of Digital Optical Phase-Locked Loop Model in Verilog HDL

Abstract

The structure of digital optical phase-locked loop includes two parts: circuit part and optical part. Since the operating mechanisms of two parts differ greatly, the simulation process is very complex. The signal transmission process of digital optical phase-locked loop is analyzed first. It is found that optical part can be simplified into a periodic dynamic adjustable beat signal model based on the hardware description language, and the problem of optical part modeling is solved. Meanwhile, to emulate the drift phenomenon of wavelength caused by optical devices under real conditions, a dynamic and variable jitter signal model is developed, which can reduce the debugging time. Finally, both the beat signal model and jitter signal model work correctly in digital simulation environment, and the accuracy of the beat signal and the jitter signal can reach fs level.