Multi-channel amplitude equalization based on liquid crystal polarization interference filters

被引:4
作者
Hamdi, Rachid [1 ,2 ]
Benkelfat, Badr-Eddine [2 ]
Vinouze, Bruno [3 ]
Benslama, Malek [4 ]
机构
[1] Univ Guelma, Dept Genie Elect, Lab LAIG, Guelma, Algeria
[2] SAMOVAR UMR INT CNRS 5157, Telecom & Management SudParis, Inst Telecom, F-91011 Evry, France
[3] Inst Telecom, Telecom Bretagne, Dept Opt, F-29238 Brest 3, France
[4] Univ Mentouri, Lab Electromagnetisme & Telecommun, Constantine, Algeria
来源
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS | 2009年 / 11卷 / 10期
关键词
polarization; birefringent filter; liquid crystal; optical communication;
D O I
10.1088/1464-4258/11/10/105402
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We propose the design of a multi-channel amplitude-equalizing polarization interference filter based on stacked liquid crystal birefringent blocks. Each block, which is optimized to control a predefined wavelength channel, consists of three components. The wavelength blocking/transmitting and the equalizing actions are provided by the liquid crystal component whose optical path difference varies between two particular values when its birefringence is electrically controlled. For a typical three-channel equalizing filter, the three liquid crystal cells provide all eight possible combinations to block/transmit channels and also allow us to independently equalize their corresponding levels. The benefit of such a polarization-based filter is that it operates without free-space demultiplexing optics and with no moving parts. It can be used as a key element in the present reconfigurable optical networks.
引用
收藏
页数:6
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