An electrically tunable liquid crystal lens coupler for the fiber communication systems

Chyong Hua Chen, Michael Chen, Yi-Hsin Lin

研究成果: Conference contribution同行評審

摘要

In this study, we demonstrated an electrically tunable lens coupler for both variable optical attenuation (VOA) and polarization selection. This coupler consists of a liquid crystal (LC) lens sandwiched between two GRIN lens. A GRIN lens is used to couple the light into the single mode fiber, and a LC lens is used to electrically manipulate the beam size of light. It is known that the lens power of a LC lens is tunable with high polarization sensitivity. Then, as the applied voltage on the LC lens is zero, the incident light is focused due to GRIN lens and coupled into the fiber. On the other hand, the beam size of the transformed e-ray becomes larger because the lens power of a LC lens for the e-ray decreases with the increase of the applied voltage. This results in the decrease of the coupling efficiency, and the optical power coupled into the fiber is smaller. This lens coupler for the e-ray functions as a VOA due to a continuous optical attenuation. On the contrary, the lens power of this LC lens for the o-ray does not vary because of optical anisotropy of the LC layer, and then the coupling efficiency for the o-ray remains high. For an arbitrary polarized incidence, this tunable lens coupler acts as a broadband polarizer for the fiber systems. The polarization dependent loss is larger than 30 dB and the switching time is around 1 second.

原文English
主出版物標題Emerging Liquid Crystal Technologies X
編輯Hirotsugu Kikuchi, Ivan I. Smalyukh, Liang-Chy Chien, Harry J. Coles
發行者SPIE
ISBN(電子)9781628414745
DOIs
出版狀態Published - 1 一月 2015
事件Emerging Liquid Crystal Technologies X - San Francisco, United States
持續時間: 9 二月 201511 二月 2015

出版系列

名字Proceedings of SPIE - The International Society for Optical Engineering
9384
ISSN(列印)0277-786X
ISSN(電子)1996-756X

Conference

ConferenceEmerging Liquid Crystal Technologies X
國家United States
城市San Francisco
期間9/02/1511/02/15

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