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Proceedings Paper

All-fiber all-optic tunable filter based on the combination of long-period grating and photorefractive cladding layer
Author(s): Shizhuo Yin; Xin Zhu; Kun-Wook Chung
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Paper Abstract

In this paper, a broadband tunable long period grating (LPG) with an ultra-thin cladding layer using liquid crystal is presented. By chemical etching the long period grating to a very thin diameter (approximately 30micrometers ), the long period grating becomes extremely sensitive to the surrounding refractive index change so that a wide range tunable filter is realized. By using liquid crystal material (18523) that has a no less than the refractive index of cladding, a resonant band of the LPG is tuned by controlling the temperature of the liquid crystal. We obtained a tuning range of 87nm with a temperature change of only approximately 22 degrees. It is believed that this filter has the largest temperature-dependent tuning effect ever reported. Further experiment will be focused on photo- induced reorientation of the liquid crystal molecules, so that another type of tunable filter via photochemical effect can be realized.

Paper Details

Date Published: 19 October 2000
PDF: 5 pages
Proc. SPIE 4110, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VI, (19 October 2000); doi: 10.1117/12.404780
Show Author Affiliations
Shizhuo Yin, The Pennsylvania State Univ. (United States)
Xin Zhu, The Pennsylvania State Univ. (United States)
Kun-Wook Chung, The Pennsylvania State Univ. (United States)


Published in SPIE Proceedings Vol. 4110:
Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VI
Shizhuo Yin; Francis T. S. Yu, Editor(s)

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