LCoS平面光栅的衍射特性及其在1×N型波长选择开关中的应用  

Diffraction Properties of LCo S Gratings and its Application in1×N Wavelength Selective Switches

作　　者：田淼[1] 陈笑[1] 高云舒 陈瀛[1] 王珊[1] 张景[1] 张颖[1] 陈根祥[1] 王义全[1] 

机构地区：[1]中央民族大学理学院,北京100081 [2]北京交通大学电子信息工程学院,北京100044

出　　处：《激光与光电子学进展》2015年第9期59-64,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(11204387);教育部科学技术研究重点项目(212205)

摘　　要：硅基液晶(LCo S)是一种新型可编程的衍射光学元件,已广泛应用于光学显示、通信与存储等领域。研究了LCo S的光束衍射特性,并将其作为波长切换器应用于1×N型波长选择开关中,成功实现了输入与任意输出端口之间的波长切换。利用光学标量衍射理论计算得到LCo S上1级光强分布及衍射效率与各物理参量的关系。结果表明:单位周期内相位阶数不低于10时,衍射损耗可稳定控制在5 d B内。在此基础上,巧妙设计了基于LCo S的1×N型波长选择开关(WSS),利用LCo S相位光栅设置的高度灵活性实现输出通道间隔的灵活可调。通道之间低串扰且独立可控。实验测得WSS系统损耗为10 d B^14 d B。Liquid crystal on silicon （LCoS） is a novel programmable diffraction optical element, which has been widely used in optical display, communication and storage etc. The diffraction of LCoS is analyzed and applied into 1 ×N wavelength selective switch （WSS） as a wavelength selector, which has succeeded in switching the input wavelength to any output port. Based on the optical scale diffraction theory, the 1st diffraction distribution and efficiency of LCoS are discussed. The results show that the diffraction loss of LCoS is stable and lower than 5 dB when the grating phase order is greater than 10 pixels. Further, an LCoS-based lxN WSS is designed and the flexible modulation of channel space is realized. The WSS crosstalk is low and each output can be controlled independently. The total system loss is around 10 dB-14 dB.

关 键 词：光栅 硅基液晶 波长选择开关 衍射 二元阶梯光栅 相位阶数 

分 类 号：TN256[电子电信—物理电子学]