介紹了一種新型低損耗大角度Y分支器的基本原理，并把這種新型結(jié)構(gòu)應用于1×4光分路器和M-Z調(diào)制器中，然后利用FDBPM方法進行了仿真，結(jié)果表明1×4光分路器在長度大大減小的同時，實現(xiàn)了只有0.32 dB的低損耗；當分支角度等于14.3°時，M-Z調(diào)制器實現(xiàn)了干涉相消。與普通結(jié)構(gòu)的器件相比，應用新型低損耗大角度Y分支器的光分路器和M-Z調(diào)制器具有損耗低、尺寸小等優(yōu)點。
關 鍵 詞 光分路器; 光調(diào)制器; Y分支; 集成光學; 有限差分光束傳播法

Abstract In this paper，A new low-loss wide-angle Y-Junction with graded-index optical waveguides, which can change the optical propagation direction, is introduced. An application of the Y-junction structure to 1×4 optical splitter and Mach-Zehnder modulator is analyzed. The two kinds of device performance are examined numerically by the finite difference beam propagation method (FDBPM). The simulated results show that the 1×4 optical splitter has very low loss of 0.32 dB but its optical waveguide length can largely be shortened, and that the M-Z modulator can reach a counteraction of the coherence light when the branching angle is 14.3°. Comparing with common devices, optical splitter and M-Z modulator with low-loss wide-angle Y-Junction have both low loss and small dimension.
Key words optical splitter; M-Z modulator; Y-Junction; integrated optics; FDBPM