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首页> 外文会议>Conference on Integrated Optics Devices Ⅴ Jan 23-25, 2001, San Jose, USA >Optoelectronic switch and continuosly tunable filter based on a liquid crystal waveguide
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Optoelectronic switch and continuosly tunable filter based on a liquid crystal waveguide

机译：基于液晶波导的光电开关和可连续调谐滤波器

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摘要

In this paper the possibility of using ferroelectric liquid crystals in active waveguide devices is explored through the analysis of an integrated electro-optic switch and a continuously tunable filter. The design and the analysis of two electro-optical devices, based on a Bragg grating integrated in a glass waveguide having liquid crystal as cover, are presented. The integrated optics structure allows to change the reflectivity of the Bragg mirror by means of electro-optic effects of smectic liquid crystals. The integrated fast electro-optic switch is based on electro-optic properties of smectic C in the Surface Stabilised liquid crystal structure and on the selective properties of integrated Bragg grating. It presents the output directly in the frequency domain, overcoming the typical problems of intensity dependent devices, without requiring external electronic circuit. Moreover the possibility to realise a novel continuously tunable integrated filter, combining the linear electro-optic effect of smectic A and the selective property of Bragg grating, has been explored. The proposed filter is characterised by a narrow bandwidth, desired feature for WDM technique. The principal advantages of such device include fast tuning speed, wide tuning range, low power consumption and low cost.
机译：本文通过对集成电光开关和连续可调滤波器的分析，探索了在有源波导器件中使用铁电液晶的可能性。提出了两种基于布拉格光栅的光电器件的设计和分析，该布拉格光栅集成在以液晶为覆盖层的玻璃波导中。集成的光学结构允许通过近晶液晶的电光效应来改变布拉格镜的反射率。集成的快速电光开关基于表面稳定的液晶结构中近晶C的电光特性以及集成的布拉格光栅的选择性特性。它直接在频域中显示输出，从而克服了强度相关设备的典型问题，而无需外部电子电路。此外，还探索了结合近晶A的线性电光效应和布拉格光栅的选择特性来实现新型连续可调集成滤波器的可能性。所提出的滤波器的特征在于窄带宽，这是WDM技术的理想特征。这种设备的主要优点包括快速调谐速度，宽调谐范围，低功耗和低成本。

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