分光比可调的光功率分束器的设计

Design of an optical power splitter with adjustable split ratio

传统的解析理论设计方案存在计算复杂度高、有限解析解、耗时长等问题。为了解决以上问题,在传统的光器件设计基础上,提出一种依据逆向设计方法的分光比可调的光功率分束器方案。在1.92μm×1.92μm的紧凑区域内,引入Ge_(2)Sb_(2)Se_(4)Te_(1)(GSST)相变材料改变器件的折射率分布。利用直接二进制搜索算法搜索GSST晶态和非晶态的最优状态分布。设计实现同一种器件结构,分光比可调的T型光功率分束器。仿真分析了器件的初始结构、分光比、相变材料区域状态分布、制造容差以及光场分布。结果表明:分光比分别为1∶1、1.5∶1、2∶1的3种光功率分束器在波长1530 nm−1560 nm之间的最小相对误差分别为0.004%、0.14%和0.22%,在制造容差范围内传输曲线最大波动分别是0.95 dB、1.21 dB、1.18 dB。该分光器结构紧凑,在光通信和信息处理领域有着较大的应用潜力。

Traditional analytical theory design scheme faces problems,such as high computational complexity,limited analytical solution,and high time-consumption.To cambat these issues,based on the design of traditional optical devices,a scheme for designing an optical power splitter with adjustable split ratio according to the reverse design method is proposed.In a compact region of 1.92μm×1.92μm,Ge_(2)Sb_(2)Se_(4)Te_(1)(GSST)is introduced to change the refractive index distribution of the device.The direct binary search algorithm is utilized to search the optimal state distribution of GSST in crystalline and amorphous states.A T-shaped optical power splitter with adjustable split ratio is designed and implemented for the same device structure.The initial structure,split ratio,phase change material region state distribution,manufacturing tolerance,and light field distribution of the device are simulated and analyzed.The results show the minimum relative errors of the designed optical power splitters with three splitting ratios of 1∶1,1.5∶1 and 2∶1 between wavelengths 1530 nm and 1560 nm are 0.004%,0.14%and 0.22%,respectively.The maximum fluctuations of the trans-mission curve in the manufacturing tolerance range are 0.95 dB,1.21 dB and 1.18 dB,respectively.The split-ter has a compact structure and great potential for applications in optical communication and information pro-cessing.