Sugita Tatsuya, Hirano Kouki, Abe Tomiya, Itoh Yuzo
Materials Research Laboratory, Hitachi, Ltd. 7-1-1, Omika-cho, Hitachi, Ibaraki 319-1292, Japan.
Appl Opt. 2007 May 20;46(15):2817-24. doi: 10.1364/ao.46.002817.
A chirped grating segmented into partitions each having a constant blaze angle to use in a demultiplexer for coarse wavelength division multiplexing with multimode optical fibers is developed. Its designed configuration utilizes a resonance region to achieve high diffraction efficiency and large dispersion. The width, blaze angle, and diffraction order of each partition were optimized by vector diffraction analysis. The diffraction loss of the manufactured grating was less than 1.5 dB, and polarization-dependent loss was less than 0.6 dB within a wavelength width of at least 70 nm. It is confirmed that a demultiplexer with the developed chirped grating had a wide passband and low cross talk.
开发了一种啁啾光栅，该光栅被分割成多个分区，每个分区具有恒定的闪耀角，用于与多模光纤进行粗波分复用的解复用器中。其设计结构利用共振区域来实现高衍射效率和大色散。通过矢量衍射分析对每个分区的宽度、闪耀角和衍射级进行了优化。所制造光栅的衍射损耗小于1.5 dB，并且在至少70 nm的波长宽度内偏振相关损耗小于0.6 dB。证实了具有所开发啁啾光栅的解复用器具有宽通带和低串扰。
