Research on Modeling and Value Evaluation of Optical Transmission Link Based on Constellation Diagram

This paper focuses on the modeling and value evaluation of optical transport networks. The relationship between bit error rate and signal-to-noise ratio is established by three constellations of QPSK, 8QAM and 16QAM signal modulation formats. Based on the signal-to-noise ratio analysis, the optical transmission link is modeled to reduce the signal-to-noise ratio tolerance, and the way to improve the constellation is explored.