Optical bandpass Lyot filter with tunable bandwidth

Rachid Hamdi (1) , Robert Farha (2) , Salah Redadaa (1) , Badr-Eddine Benkelfat (3, 4, 5) , Djamel Abed (1) , Abderazek Helaci (1) , Yassin Boumakh (1)

1 Département d'Electronique et de Télécommunications, Laboratoire des Télécommunications
2 ESIB - Ecole supérieure d'ingénieurs de Beyrouth
3 TSP - EPH - Département Electronique et Physique
4 SAMOVAR - Services répartis, Architectures, MOdélisation, Validation, Administration des Réseaux
5 CNRS - Centre National de la Recherche Scientifique

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 lambda i = 1.543 um, 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.

Mots clés: Lyot filter; Optical communication; Optical filter; Bandwidth tuning; Birefringent filter

Domaines: Optique / photonique

Rachid Hamdi, Robert Farha, Salah Redadaa, Badr-Eddine Benkelfat, Djamel Abed, et al.. Optical bandpass Lyot filter with tunable bandwidth. ICT '12 : 19th International Conference on Telecommunications, Apr 2012, Jounieh, Lebanon. pp.1-4, ⟨10.1109/ICTEL.2012.6221231⟩. ⟨hal-00765979⟩