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高级光调制格式能够有效抑制随信道速率的增加而给系统带来的色散、非线性等传输损伤,是高速光传输系统的关键技术之一。研究了基于马赫-曾德尔调制器(MZM)产生的八进制差分相位幅度键控非归零码(NRZ-ODPASK)、八进制差分相位幅度键控归零码(RZ-ODPASK)以及八进制差分相位幅度键控载波抑制归零码(CSRZ-ODPASK)在40 Gbit/s速率下的传输性能。结果表明,RZ-ODPASK调制格式抗色散能力较强,且相位支路的色散容限均大于幅度支路;在波分复用(WDM)系统中,CSRZ-ODPASK信道间串扰代价比NRZ-ODPASK和RZ-ODPASK分别小0.81 dB和0.19 dB,更加适合高速光纤传输系统。
The advanced optical modulation format can effectively suppress the transmission damage caused by dispersion and nonlinearity caused by the increase of the channel speed, and is one of the key technologies of a high-speed optical transmission system. Based on the Mach-Zehnder modulator (MZM), the generation of octal differential phase amplitude keying non-return to zero (NRZ-ODPASK), octal differential phase keying zeroing code (RZ-ODPASK) and octal differential phase amplitude Control Carrier Reduce Carrier Tolerance (CSRZ-ODPASK) Transmission Performance at 40 Gbit / s. The results show that the RZ-ODPASK modulation scheme has strong anti-dispersion ability and the dispersion tolerance of the phase branch is larger than that of the amplitude branch. In the WDM system, the cost of crosstalk between CSRZ-ODPASK channels is lower than NRZ-ODPASK And RZ-ODPASK small 0.81 dB and 0.19 dB, respectively, more suitable for high-speed optical fiber transmission system.