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提出了一种偏振光干涉型光交错复用器的新结构。其核心元件双折射模拟波片等效于双折射晶体波片 ,可以获得比一般双折射晶体大得多的等效双折射。该光交错复用器除了具有一般偏振光干涉型光交错复用器的稳定性好、可靠性高的特点外 ,特别具有隔离度更高和更容易实现各种大小频率间隔的优点。利用该结构设计了用于 50GHz频率间隔波分复用信号的奇偶分离的光交错复用器 ,通带和阻带的平坦宽度均大于 1/ 5周期 ,隔离度为 -3 0dB。同时 ,对该器件在实际应用中的几个基本参量 ,如插入损耗、偏振相关损耗和成本等也作了分析和讨论。
A new structure of polarization interference type optical interleaver is proposed. Its core element birefringence analog wave plate is equivalent to birefringent crystal wave plate, can get much larger than the average birefringent crystal equivalent birefringence. The optical interleaver has the advantages of good stability and high reliability of a general polarization interference optical interleaver, and has the advantages of higher isolation and easier frequency spacing of various sizes. Using this structure, a parity interleaved interleaver for 50GHz frequency-division wavelength division multiplexed signals is designed. The passband and stopband have flat widths greater than 1 / 5th cycle and isolation of -3 0dB. At the same time, some basic parameters of the device in practical applications, such as insertion loss, polarization-dependent loss and cost, are also analyzed and discussed.