19 October 2000 All-fiber all-optic tunable filter based on the combination of long-period grating and photorefractive cladding layer
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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.
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Shizhuo Yin, Shizhuo Yin, Xin Zhu, Xin Zhu, Kun-Wook Chung, 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); doi: 10.1117/12.404780; https://doi.org/10.1117/12.404780
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