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Proceedings Paper

Optoelectronic switch and continuously tunable filter based on a liquid crystal waveguide
Author(s): Luigi Sirleto; Giuseppe Coppola; Antonella D'Agata; Giovanni Breglio; Antonello Cutolo
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Paper Abstract

In this paper the possibility of using ferroelectric liquid crystals in active waveguide devices is explored through the analysis of an integrated electro-optic switch and a continuously tunable filter. The design and the analysis of tow electro-optical devices, based on a Bragg grating integrated in a glass waveguide having liquid crystal as cover, are presented. The integrated optics structure allows to change the reflectivity of the Bragg mirror by means of electro-optic effects of smectic liquid crystals. The integrated fast electro-optic switch is based on electro- optic properties of smectic C* in the Surface Stabilized liquid crystal structure and on the selective properties of integrated Bragg grating. It presents the output directly in the frequency domain, overcoming the typical problems of intensity dependent devices, without requiring external electronic circuit. Moreover the possibility to realize a novel continuously tunable integrated filter, combining the linear electro-optic effect of smectic A* and the selective property of Bragg grating, has been explored. The proposed filter is characterized by a narrow bandwidth, desired feature for WDM technique. The principal advantages of such device include fast tuning speed, wide tuning range, low power consumption and low cost.

Paper Details

Date Published: 15 May 2001
PDF: 8 pages
Proc. SPIE 4277, Integrated Optics Devices V, (15 May 2001); doi: 10.1117/12.426810
Show Author Affiliations
Luigi Sirleto, Univ. degli Studi di Napoli Federico II (Italy)
Giuseppe Coppola, Univ. degli Studi di Napoli Federico II (Italy)
Antonella D'Agata, Univ. degli Studi di Napoli Federico II (Italy)
Giovanni Breglio, Univ. degli Studi di Napoli Federico II (Italy)
Antonello Cutolo, Univ. del Sannio (Italy)


Published in SPIE Proceedings Vol. 4277:
Integrated Optics Devices V
Giancarlo C. Righini; Seppo Honkanen, Editor(s)

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