A Low-latency Multi-format Carrier Phase Recovery Hardware for Coherent Optical Communication

Abstract

Fast and accurate estimation of carriers is particularly vital in modern coherent optical communication. Achieving a real-time system with low latency and high throughput is challenging. The implementation structure of the real-time system is essential due to the increasing complexity of algorithms and data decimals. This paper proposes a carrier phase recovery (CPR) implementation based on blind phase search (BPS) with data multiplexing. All the computations are performed in cartesian coordinates without using coordinate conversion and standard multiplier or DSP. When evaluating this circuit structure on the Xilinx ZCU102 platform, the clock frequency can reach 620MHz, and the latency of processing 79.3Gbps 16QAM signal is 18 clock cycles.