摘要
通过理论推导证明了信号功率波形自相关函数中包含一个脉冲,利用该脉冲位置可以估计信道色散的大小。在此基础上,给出了用于相干接收系统的色散监测算法。搭建了112Gb/s(28GBaud)的偏分复用非归零四相相移键控(PDM-NRZ-QPSK)实验系统对此方法进行了验证。并利用OptiSystem和Matlab协同仿真,搭建了56Gb/s的单偏振四相相移键控(QPSK)和112Gb/s偏分复用四相相移键控(PDM-QPSK)仿真系统,分析了该方法对非归零(NRZ)、归零67(RZ67)、归零50(RZ50)、归零33(RZ33)等不同码型的适用性。实验和仿真结果与理论推导一致,证明了该方法的可行性。实验监测误差小于275ps/nm,仿真监测误差小于185ps/nm。
It is confirmed through theoretical derivation that auto-correlation function of signal power waveform contains a pulse, whose location can be used to estimate chromatic dispersion. On this basis, the algorithm of chromatic dispersion monitoring is given. This method is verified in 112 Gb/s （28 GBaud） polarization division multiplexing non return to zero quadrature phase shift keying （PDM-NRZ-QPSK） experimental system. Using OptiSystem and Matlab, 56 Gb/s single polarization QPSK and 112 Gb/s PDM-QPSK simulation systems are setup and the applicability of this method to code pattern of NRZ, RZ67, RZ50 and RZ33 is analyzed. The experiment and simulation results are consistent with the analytical derivation, which confirms the feasibility of the method. The experimental monitoring error is less than 275 ps/nm, and the monitoring error of simulation is less than 185 ps/nm.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2013年第12期61-67,共7页
Acta Optica Sinica
基金
国家自然科学基金(61205065)
高等学校博士学科点专项科研基金(20110005110014)
山东省自然基金项目(ZR2010FM043)
关键词
光通信
色散监测
自相关函数
光性能监测
相干检测
optical communications
chromatic dispersion monitoring
auto-correlation function
optical performance monitoring
coherent detection
