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Proceedings Paper

Comparison and analysis of tunable method in photorefractive wavelength-selective filter
Author(s): Jun-Won An; Nam Kim; Kwon-Yeon Lee
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Paper Abstract

A new tuning scheme of the photorefractive filter is presented using LiNbO3 crystal doped with 0.015Wt.% Fe. Analyzing the filter bandwidth property from the geometrical method, a new wavelength selectivity theory is derived. The center wavelength can be tuned by the real-time received beam angle control using the spatial light modulator. As tuning time depends on the response time of the spatia light modulator, it has high tuning speed. The use of thermally fixed single grating makes the uniform diffraction property over all filtering range. Designed tunable filter consists of the three channel with 4 nm bandwidth and 10 nm spacing. From the optical experiment, we get the real-time tunable filter which has 4.5 nm, 4.25 nm, 4 nm bandwidth and 1530.5 nm, 1540.5 nm, 1549.5 nm center wavelength, respectively. Demonstrated filter has a switching time of several tens milli-second and a full tuning range of 20 nm.

Paper Details

Date Published: 20 September 1999
PDF: 11 pages
Proc. SPIE 3801, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications V, (20 September 1999); doi: 10.1117/12.363935
Show Author Affiliations
Jun-Won An, Chungbuk National Univ. (South Korea)
Nam Kim, Chungbuk National Univ. (South Korea)
Kwon-Yeon Lee, Sunchon National Univ. (South Korea)


Published in SPIE Proceedings Vol. 3801:
Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications V
Francis T. S. Yu; Shizhuo Yin, Editor(s)

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