绝热式方向性耦合器修正型汉明权重函数之适当波导长度与结构影响

研究绝热式方向性偶合器修正型汉明权重函数之适当波导长度与结构影响.传统的光方向耦合器之理论是由绝热条件下所获得之结果,因此在波导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件.文中主要的指标为修正型汉明权重函数之低串扰、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修正型汉明权重函数在此架构下能获得较佳的设计结果.

Waveguide Structure Effect for the Suitable Length of Adiabatic Directional Full Couplers by Modified-Hamming Weighting Function

Waveguide structure effect for the suitable length of adiabatic directional full couplers by modified-hamming weighting function is described. The validity of approximation theory of adiabatic directional full couplers becomes questionable when the coupling length is not enough long so the beam propagation method is used. 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 in the new design of adiabatic directional full couplers can obtain low noise, short couplers respectively. It is surely that the proposed modification-hamming function weighting is more effective than convention weighting for adiabatic directional full couplers.