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Proceedings Paper

Liquid-crystal-based tunable optical filtering devices for DWDM
Author(s): Ru-Pin Pan; Xiou-Xhi Tung; Jun-Yu Chen; Ming-Jay Huang; Ci-Ling Pan
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Paper Abstract

We report a new configuration of tunable optical filter for DWDM applications. In this design, first-order diffracted signal light by a grating is directed to a lens and focused on to a transmission-type liquid crystal spatial light modulator (LC-SLM). Wavelength channels are selected by opening the appropriate pixels of the LC-SLM for transmission. The device is demonstrated by using a broad-band AR-coated laser diode as the signal light. For conceptual demonstration, we use optical fibers with a core diameter of 50 microns instead of the LC-SLM. A total of 37 channels, spanning 33.6 nm were successfully selected with channel spacing of 0.94 nm and bandwidth of 0.4 nm. With 100 micron-wide pixels separated by 5 microns in the LC-SLM and a 1800 lines/mm grating, we show selection of five channels with channel spacing of 0. 78 nm. The bandwidth is 0.43 nm. The channel isolation is better than 20 dB. At a wavelength of 1.5 micron, channel spacing as small as 12.4 GHz can be realized. This device is also expected to be useful for other DWDM applications, e.g., switching and routing.

Paper Details

Date Published: 30 July 2001
PDF: 5 pages
Proc. SPIE 4532, Active and Passive Optical Components for WDM Communication, (30 July 2001); doi: 10.1117/12.436017
Show Author Affiliations
Ru-Pin Pan, National Chiao Tung Univ. (Taiwan)
Xiou-Xhi Tung, National Chiao Tung Univ. (Taiwan)
Jun-Yu Chen, National Chiao Tung Univ. (Taiwan)
Ming-Jay Huang, National Chiao Tung Univ. (Taiwan)
Ci-Ling Pan, National Chiao Tung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 4532:
Active and Passive Optical Components for WDM Communication
Achyut Kumar Dutta; Abdul Ahad Sami Awwal; Niloy K. Dutta; Katsunari Okamoto, Editor(s)

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