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研究了一种基于CSRZ(载波抑制归零码)的多级相位调制技术在光纤通信系统中的应用.分析了CSRZ、DQPSK(正交差分相移键控)、8DPSK(八差分相移键控)调制格式的特征,理论上推导出了CSRZ-DQPSK和CSRZ-8DPSK的调制解调原理公式,给出了其调制解调方式及具体过程的实现,并用Matlab仿真得到了CSRZ、CSRZ-DQPSK和CSRZ-8DPSK调制后的频谱图和解调后的眼图.性能分析的结果表明,CSRZ-DQPSK和CSRZ-8DPSK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,因此具有更高的色散、非线性损耗容限和更低的信道间串扰,解调后的眼图性能也很好,有望成为下一代光纤通信系统的首选传输码型.
The application of multi-level phase modulation based on CSRZ (carrier suppression zeroing) in optical fiber communication system is studied.The influences of CSRZ, DQPSK (quadrature differential phase shift keying), 8DPSK (eight differential phase shift keying ) Modulation theory, the modulation and demodulation formulas of CSRZ-DQPSK and CSRZ-8DPSK are theoretically deduced. The modulation and demodulation methods and the realization of the specific process are given. The CSRZ, CSRZ-DQPSK and CSRZ-8DPSK modulated spectrum and demodulated eye diagram.The results of performance analysis show that CSRZ-DQPSK and CSRZ-8DPSK as a new multi-level phase modulation format with narrower spectral width, higher spectral efficiency, Therefore, it has higher dispersion, non-linear loss tolerance and lower crosstalk between channels, and the demodulated eye performance is also good, which is expected to become the preferred transmission pattern for the next generation of optical fiber communication systems.