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DWDM系统中,DRZ、CRZ编码输出光谱和NRZ编码相近,但传输后光谱及色散容限区间都不尽相同,造成OSNR指标的测试方法与NRZ有较大差别。根据DRZ、CRZ信号光谱的特点介绍了一种OSNR的测试方法。
DWDM system, DRZ, CRZ encoding output spectrum and NRZ encoding similar, but the transmission spectrum and dispersion tolerance range are not the same, resulting in OSNR index test method and NRZ are quite different. According to the characteristics of DRZ and CRZ signal spectrum, a method of testing OSNR is introduced.