Zhang Xia1, Wang Fang1, Zhang Min1, et al. Study on CSRZ-based DQPSK multi-level phase modulation technology[J]. 2009,(5):8-9. DOI: 10.13756/j.gtxyj.2009.05.005.
This article theoretically derives the formulas for the principles of Carrier-Suppressed Return-to-Zero(CSRZ) and Differential Quadrature Phase Shift Keying(DQPSK) modem
presents the specific processes of their implementation and obtains by simulation their spectra after modulation and eye diagrams after demodulation.The results show that CSRZ-DQPSK
as a new multi-level phase modulation format
has narrower spectrum width and higher spectrum efficiency
and good eye diagram performance after demodulation
expected to become the first choice of the transmission code for the next generation fiber-optic communication system.
关键词
光纤通信技术载波抑制归零码差分正交相移键控多级相位调制
Keywords
fiber-optic communication technologyCSRZDQPSKmulti-level phase modulation