Frame/symbol synchronization in coherent optical OFDM

摘要

One aspect provides an optical communication system. The system includes an optical-to-digital converter, a frequency estimator and a symbol synchronizer. The optical-to-digital converter is configured to receive an optical OFDM bit stream including an OFDM symbol bearing payload data and a symbol header preceding the OFDM payload data. The frequency estimator is configured to determine a carrier frequency offset of the payload data from the symbol header. The symbol synchronizer is configured to determine a starting location of the payload data within the bit stream by cross-correlating a synchronization pattern within the symbol header with a model synchronization pattern stored by the symbol synchronizer.

主权项

1. An optical communication system, comprising:
an optical receiver configured to receive an optical OFDM bit stream including an OFDM symbol bearing payload data and a symbol header preceding said OFDM payload data; a first frequency estimator configured to determine a carrier frequency offset of said payload data from said symbol header; and a first symbol synchronizer configured to determine a starting location of said payload data within said bit stream by cross-correlating a synchronization pattern within said symbol header with a model synchronization pattern stored by said optical receiver; wherein a first data path comprises said first frequency estimator and said first symbol synchronizer, and a second data path that operates in parallel with said first data path comprises a second frequency estimator and a second symbol synchronizer.