光方向耦合器汉明函数之波导结构影响

摘要

The effect of coupling waveguide structure weighted by hamming function for optical directional full couplers is investigated. The validity of approximation theory of optical directional full couplers be-comes questionable when the coupling length is not enough long. We propose a new design and numerically show that some optical properties of the optimized one are better than the optimized coupler with hamming function weighting. The objective of the work includes two parts: the first part defines theory ranges and processing tolerance of optical directional full couplers. The second part is optimization waveguide structure of optical directional full couplers for low crosstalk, broad bandwidth and short coupler length. Definitely hamming function weighting which proposed can obtain better result after the structural design.%在本文章中研究光方向耦合器汉明函数之波导结构影响.传统的光方向耦合器之理论是由绝热的条件下所获得之结果,因此在波道耦合长度不夠长时则变得可疑,有鑑于此需要依靠光束模拟软体.在文章中有两个主要的指标:第一个为理论所适用的范围,第二个为最佳化低串扰、宽频宽和较短的耦合器长度.最后由结果得知我们所提出使用的汉明权重函数在此架构下能获得较佳的设计结果.