设计了基于级联型马赫-曾德尔调制器(MZM)的光非归零-双二进制码(NRZ-DB)、光66％归零-双二进制码(66％RZ-DB)和光33％归零-双二进制码(33％RZ-DB)的产生结构,推导了3种码型的理论表达式,分析了其时频域结构,并对3种码型的传输特性进行了实验验证.%This paper proposes the generating structures of optical not return to zero-duobinary (NRZ-DB),the optical 66％ return to zero-duobinary (66％RZ-DB) and the optical 33％ retum to zero-duobinary (33％RZ-DB),which were based on series MZM,discusses their theoretical expressions and time domain and frequency domain,and carries out the experiments to verify their transmission properties.
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