Short Waveguide Polarization Converter Operating Over a Wide Wavelength Range
Short Waveguide Polarization Converter Operating Over a Wide Wavelength Range
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DOI：
10.1109/jlt.2013.2253445
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发表时间：
2013-05-15
影响因子：
4.7
通讯作者：
Nakano, Hisamatsu
中科院分区：
文献类型：
--
作者：
Wakabayashi, Yuu;Hashimoto, Takashi;Nakano, Hisamatsu
采用基于Yee网格的虚距光束传播方法和时域有限差分法对一种简单的L形波导偏振转换器进行了分析。结果表明，在波长为1.55μm时，偏振转换长度为3.24μm，插入损耗为0.46dB。为了实现宽带操作，我们通过 L 形波导中生成的两个本征模之间的有效折射率差来确定器件长度。结果，在1.3至1.6μm的宽波长范围内获得了超过20dB的消光比。最后，为了减少插入损耗，我们提出了一种改进的结构，其中对角线位置的两个角被切割成90度角。
A simple polarization converter using an L-figured waveguide is analyzed by the imaginary-distance beam-propagation-method based on Yee's mesh and the finite-difference time-domain method. It is revealed at a wavelength of 1.55 mu m that the polarization conversion length is 3.24 mu m with an insertion loss of 0.46 dB. To achieve a wideband operation, we determine a device length by the effective index difference between the two eigenmodes generated in the L-figured waveguide. As a result, an extinction ratio of more than 20 dB is obtained over a wide wavelength range of 1.3 to 1.6 mu m. Finally, to reduce the insertion loss, we propose a modified structure, in which two corners in a diagonal position are cut with an angle of 90 degrees.