All-fiber all-optic tunable filter based on the combination of long-period grating and photorefractive cladding layer

Shizhuo Yin; Xin Zhu; Kun-Wook Chung

doi:10.1117/12.404780

19 October 2000 All-fiber all-optic tunable filter based on the combination of long-period grating and photorefractive cladding layer

Shizhuo Yin, Xin Zhu, Kun-Wook Chung

Author Affiliations +

Proceedings Volume 4110, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VI; (2000) https://doi.org/10.1117/12.404780
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

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 n_o 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.

Citation Download Citation

Shizhuo Yin, Xin Zhu, and Kun-Wook Chung "All-fiber all-optic tunable filter based on the combination of long-period grating and photorefractive cladding layer", Proc. SPIE 4110, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VI, (19 October 2000); https://doi.org/10.1117/12.404780

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