DQPSK TRANSMITTER WITH PARALLEL PRECODER AND HIGH-SPEED DQPSK DATA STREAM REALIGNMENT

摘要

The present invention utilizes field programmable gate arrays (FPGAs) to implement a parallel differential quadrature phase shift keying (DQPSK) precoder and a DQPSK optical transmitter with an automatic realignment process. The present invention can perform DQPSK precoding, modulation, and data stream realignment at any lower rate, and its upper rate is determined by capability in speed and logic resources and external connections of available integrated circuit technology.