High Contrast Twisted Nematic Liquid Crystal Cells for Optical Switching At 1.5 μm
High Contrast Twisted Nematic Liquid Crystal Cells for Optical Switching At 1.5 μm
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用于 1.5 μm 光学开关的高对比度扭曲向列液晶盒
DOI：
10.1080/10587259808024401
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
J. Grupp
中科院分区：
文献类型：
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作者：
N. Collings;M. Bouvier;Benno J. Züger;J. Grupp
摘要 对于电信和计算应用来说，低损耗的可重构、透明交换机引起了极大的兴趣。液晶器件是此类应用的有力竞争者，因为它们是经过测试的技术，可以进行空间复用，并且可以以相对较低的成本制造。该开关的主要性能标准应在 1.55 μm 左右的 25 nm 带宽内保持不变，包括：每个通道的总体损耗小于 3 dB，通道间的串扰小于 -25 dB。这些条件需要液晶盒在关闭状态下将入射偏振矢量旋转 90°，在开启状态下旋转 0°。在目前的工作中，首先通过数值模拟对电池进行研究。它使用具有低吸收导电涂层的厚玻璃板和外围铝箔垫片组装而成。通过实验验证了模拟结果。
Abstract There is considerable interest in reconfigurable, transparent switches with low loss for both telecom and computing applications. Liquid crystal devices are strong contenders for such applications because they are a tested technology, they can be spatially multiplexed and they can be manufactured at relatively low cost. The main performance criteria of the switch, which should be maintained over a 25 nm bandwidth around 1.55 μm, are: less than 3 dB overall loss per channel, and less than -25 dB crosstalk between channels. These conditions require a liquid crystal cell which rotates the incident polarisation vector by 90° in the off-state, and by 0° in the on-state. In the present work, the cell is first studied by numerical simulation. It is assembled using thick glass plates with low absorption conductive coatings, and peripheral aluminium foil spacers. The simulated results were verified by experiment.