In-Phase and Quadrature Pattern Alignment for Quadrature Phase Shift Keying Optical Transmitters

摘要

I/Q data skew in a QPSK modulator may be detected by sending identical or complementary data streams to I and Q channel PSK modulators, setting the relative carrier phase between I and Q to zero or &pgr;, and monitoring the average QPSK output power, where the data streams sent to the I and Q channels include pseudorandom streams of ones and zeroes.