Zheng Jiangjun, Zhou Changhe, Feng Jijun, Wang Bo
Information Optics Laboratory, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China.
Opt Lett. 2008 Jul 15;33(14):1554-6. doi: 10.1364/ol.33.001554.
We investigated the use of a deep-etched fused-silica grating with triangular-shaped grooves as a highly efficient polarizing beam splitter (PBS). A triangular-groove PBS grating is designed at a wavelength of 1550 nm to be used in optical communication. When it is illuminated in Littrow mounting, the transmitted TE- and TM-polarized waves are mainly diffracted in the minus-first and zeroth orders, respectively. The design condition is based on the average differences of the grating mode indices, which is verified by using rigorous coupled-wave analysis. The designed PBS grating is highly efficient over the C+L band range for both TE and TM polarizations (>97.68%). It is shown that such a triangular-groove PBS grating can exhibit a higher diffraction efficiency, a larger extinction ratio, and less reflection loss than the binary-phase fused-silica PBS grating.
我们研究了一种具有三角形凹槽的深度蚀刻熔融石英光栅作为高效偏振分束器（PBS）的应用。三角形凹槽PBS光栅设计用于1550 nm波长，以用于光通信。当以 Littrow 安装方式照射时，透射的TE偏振波和TM偏振波分别主要在负一级和零级衍射。设计条件基于光栅模式折射率的平均差异，这通过严格耦合波分析得到验证。所设计的PBS光栅在C + L波段范围内对TE和TM偏振均具有高效性（>97.68%）。结果表明，与二元相位熔融石英PBS光栅相比，这种三角形凹槽PBS光栅可以表现出更高的衍射效率、更大的消光比和更低的反射损耗。
