Chen Yijing, Ho Seng-Tiong, Krishnamurthy Vivek
Appl Opt. 2013 Dec 20;52(36):8845-53. doi: 10.1364/AO.52.008845.
All-optical switching operation based on manipulation of absorption in a three-waveguide directional coupler is theoretically investigated. The proposed structure consists of one absorptive central waveguide and two identical passive side waveguides. Optically induced absorption change in the central waveguide effectively controls the coupling of light between the two side waveguides, leading to optical switching action. The proposed architecture alleviates the fabrication challenges and waveguide index matching conditions that limit previous demonstrations of similar switching schemes based on a two-waveguide directional coupler. The proposed device accommodates large modal index difference between absorptive and passive waveguides without compromising the switching extinction ratio.
基于三波导定向耦合器中吸收操纵的全光开关操作进行了理论研究。所提出的结构由一个吸收性中心波导和两个相同的无源侧边波导组成。中心波导中光致吸收变化有效地控制了两个侧边波导之间的光耦合，从而导致光开关动作。所提出的架构缓解了制造挑战以及限制先前基于双波导定向耦合器的类似开关方案演示的波导折射率匹配条件。所提出的器件在不影响开关消光比的情况下，能够适应吸收性和无源波导之间较大的模态折射率差。
