新型大角度低损耗Y分支在集成光器件中的应用

介绍了一种新型低损耗大角度Y分支器的基本原理，并把这种新型结构应用于1×4光分路器和M-Z调制器中，然后利用FDBPM方法进行了仿真，结果表明1×4光分路器在长度大大减小的同时，实现了只有0.32 dB的低损耗；当分支角度等于14.3°时，M-Z调制器实现了干涉相消。与普通结构的器件相比，应用新型低损耗大角度Y分支器的光分路器和M-Z调制器具有损耗低、尺寸小等优点。
关 键 词 光分路器; 光调制器; Y分支; 集成光学; 有限差分光束传播法

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