Design of 50 G nonpolarizing dense wavelength division multiplexer angle-tuning bandpass filter.
Design of 50 G nonpolarizing dense wavelength division multiplexer angle-tuning bandpass filter.
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DOI：
10.1364/ao.49.005271
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发表时间：
2010-10
期刊：
影响因子：
1.9
通讯作者：
Xianming Chen;Junxian Ma;Yatao Yang
中科院分区：
文献类型：
--
作者：
Xianming Chen;Junxian Ma;Yatao Yang
窄带滤光片在p偏振光和s偏振光之间的传输特性差异，特别是中心波长分离，将在斜入射时破坏滤光片的性能。本文通过在低折射率间隔层的两侧非对称地添加高折射率材料，调节间隔层的等效折射率，使两个偏振的中心波长在20°入射时完全重合;通过在间隔物两侧设置不同的反射层，并将部分反射层替换为等效层，使0.5dB归一化通带宽度保持在0.2nm，满足50 G密集波分复用器滤波器的要求。
Transmission characteristic differences of a narrow bandpass filter between p- and s-polarized light, especially the central wavelength separation, will corrupt the performance of the filter when the incidence is oblique. In this paper, by adding high-index materials asymmetrically to both sides of a low-index spacer, which tunes the equivalent index of the spacer, the central wavelengths of the two polarizations coincide perfectly when in 20° incidence; with different reflected layers on the two sides of the spacers and replacing some reflected layers with equivalent layers, the 0.5 dB normalized passband width is kept at 0.2 nm, which meets the requirement of the 50 G dense wavelength division multiplexer filter.