基于CSRZ码的DQPSK多级相位调制技术的研究
Study on CSRZ-based DQPSK multi-level phase modulation technology
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 fiber-optic communication technology CSRZ DQPSK multi-level phase modulation
摘要
文章从理论上推导出了载波抑制归零(CSRZ)码和差分正交相移键控(DQPSK)的调制解调原理公式, 给出了实现的具体过程, 以及仿真得到的调制后的频谱图和解调后的眼图。结果表明, CSRZ-DQPSK作为新型多级相位调制格式具有更窄的频谱宽度、更高的频谱效率, 解调后的眼图也很好, 有望成为下一代光纤通信系统的首选传输码型。
Abstract
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.
张霞, 王芳, 张民, 牛慧娟, 许恒迎, 白成林, 张晓光. 基于CSRZ码的DQPSK多级相位调制技术的研究[J]. 光通信研究, 2009, 35(5): 8. Zhang Xia, Wang Fang, Zhang Min, Niu Huijuan, Xu Hengying, Bai Chenglin, Zhang Xiaoguang. Study on CSRZ-based DQPSK multi-level phase modulation technology[J]. Study On Optical Communications, 2009, 35(5): 8.
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