提出了利用偏振延时干涉仪(PDI)实现CSRZ到Duobinary转换的全光码型转换器.根据偏振延时干涉仪的结构设计,分析了实现CSRZ到Duobinary码型的转换原理,并仿真模拟了码型转换过程,证明了方案的可行性.通过改变双折射介质的差分群时延,讨论了它对干涉结果的影响,结果表明:不精确的差分群时延会导致输出Duobinary码消光比下降和接收灵敏度的损伤.%An all-optical format conveter based on polarization delay interferometer (PDI) is investigated. Ac-croding to the configuration design of the PDI, operation principle for CSRZ to Duoinary signal is analyzed, and numerically simulation proves that the presented scheme is feasible. The influence of differential group delay on the interference results is also investigated, it shows that inaccurate differential group delay will lead to degration of extinction ratio and receiver sensitivity of the output Duoinary signals.
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