Huang Ying1, Hu Yi1, Yu Shaohua1, et al. Test and analysis of constellation map of 100 Gbit/s DP-QPSK modulated optical signals[J]. 2012,(4):1-3. DOI: 10.13756/j.gtxyj.2012.04.003.
As the quality of the modulated optical signals is associated with that of the transmitted and received signals
it is very important to test and analyze them.This paper describes the generating principle of the modulated optical signals in 100 Gbit/s transponder modules and conducts the necessary theoretical exploration of such parameters as Optical Signal Noise Ratio(OSNR)
Error Vector Magnitude(EVM) and constellation map involved in digital optical signal tests.In addition
it analyzes the graphs of constellation maps of various QPSK signals
offering an effective reference for the analysis by transmitters.