论文部分内容阅读
研究了基于相位调制原理的新型调制格式差分八相相移键控(D8PSK),给出了串联和并联两种信号生成方案,对包括非归零码(NRZ)、33%占空比归零码(33%RZ)、50%占空比归零码(50%RZ)、载波抑制归零码(CSRZ)4种不同码型的生成方式进行了说明,对信号的接收过程和预编码公式进行了理论推导,并对系统进行了仿真。仿真系统中信号总速率达到100 Gbit/s,信号生成采用串联方式,信号接收采用4个马赫-曾德尔时延干涉仪(MZI)平衡检测接收机,色散补偿方式采用对称补偿,通过眼图可以看到其接收效果良好。最后对不同码型的D8PSK与DQPSK系统在抵抗群速度色散效应、非线性效应及偏振模色散效应3种主要影响系统传输性能的因素方面进行了分析比较。当眼图张开度代价为1dB时,CSRZ-D8PSK信号的群速度色散容限、非线性容限及偏振模色散容限分别为190ps/nm、4.4 dBm及24 ps,结果表明其具有较好的传输性能。
A new modulation format differential eight-phase shift keying (D8PSK) based on the principle of phase modulation is studied. Two signal generation schemes are proposed, which include series and parallel signals, including NRZ, 33% duty cycle (33% RZ), 50% duty cycle zero code (50% RZ) and carrier suppression zeroing code (CSRZ) are described. The signal receiving process and the precoding formula Conducted a theoretical derivation, and the system was simulated. The total signal rate in the simulation system reaches 100 Gbit / s, the signals are generated in series, the signal reception is performed with 4 Mach-Zehnder delay interferometer (MZI) balance detection receivers, and the dispersion compensation method uses symmetrical compensation. See its reception is good. Finally, the D8PSK and DQPSK systems with different patterns are analyzed and compared in terms of three factors that can resist the group velocity dispersion effect, nonlinear effect and polarization mode dispersion effect, which affect the transmission performance of the system. When the eye opening cost is 1dB, the group velocity dispersion tolerance, nonlinearity tolerance and polarization mode dispersion tolerance of CSRZ-D8PSK signal are 190ps / nm, 4.4dBm and 24ps, respectively. The results show that it has good transmission performance.