CAJ | 학술논문

对波分复用系统中一种重要的解复用器-衍射蚀刻光栅(EDG)的输出结构进行了研究,并提出一种新的采用渐变波导和空气槽相结合的结构设计,在保持器件原有的紧凑结构的前提下极大的提高了器件的频谱特性.该结构设计不需要额外的工艺过程,并且具有很好的工艺容差性.结构的有效性通过波束传播方法(BPM)和模式传播分析(MPA)得到了验证.在所给的数值模型中,-1 dB带宽和品质因素分别比传统设计提高了1.474和1.383倍.同时,相邻信道间的串扰降低了15 dB以上,而整个结构引入的功率损耗仅仅为0.65 dB.
대파분복용계통중일충중요적해복용기-연사식각광책(EDG)적수출결구진행료연구,병제출일충신적채용점변파도화공기조상결합적결구설계,재보지기건원유적긴주결구적전제하겁대적제고료기건적빈보특성.해결구설계불수요액외적공예과정,병차구유흔호적공예용차성.결구적유효성통과파속전파방법(BPM)화모식전파분석(MPA)득도료험증.재소급적수치모형중,-1 dB대관화품질인소분별비전통설계제고료1.474화1.383배.동시,상린신도간적천우강저료15 dB이상,이정개결구인입적공솔손모부부위0.65 dB.
The output structure of an etched diffraction grating is studied. By introducing a combination of tapers and air slots into the output structure, the spectral performance of the device is greatly improved with little loss penalty, while the compactness of the device is remained. The structure requires no additional fabrication process, and has a good fabrication tolerance. The beam propagation method and the guided-mode propagation analysis are used to demonstrate the advantages of the present design. In a numerical example, the -1dB passband width and the figure of merit of a designed demultiplexer are increased by 1.474 and 1.383 times, respectively, as compared to a demultiplexer with a conventional structure. Furthermore, the crosstalk is reduced by more than 15 dB and the loss penalty is only about 0.65 dB.