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Optical bandpass Lyot filter with tunable bandwidth

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7 Author(s)
Rachid Hamdi ; Lab. des Telecommun., Univ. 8 Mai 1945, Guelma, Algeria ; Robert Mikhael Farha ; Salah Redadaa ; Badr-Eddine Benkelfat
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We experimentally demonstrate the feasibility of the bandwidth tuning of a liquid-crystal based bandpass Lyot filter. This bandwidth tuning is achieved by applying a voltage to vary the birefringence of the liquid-crystal cells whose optical path difference takes predefined discrete values. We show that for a 2-stage liquid-crystal Lyot filter and at λi = 1.543 μm, the measured 3-dB bandwidth varies from 17 nm to 60 nm when the applied voltage increases from 0 V to 5.24 V. The shape of the transmission response remains unchanged during the bandwidth tuning process.

Published in:

Telecommunications (ICT), 2012 19th International Conference on

Date of Conference:

23-25 April 2012