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Tunable integrated optical filter made of a glass ion-exchanged waveguide and an electro-optic composite holographic grating

A. d’Alessandro, D. Donisi, L. De Sio, R. Beccherelli, R. Asquini, R. Caputo, and C. Umeton

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Abstract

We report the fabrication and the optical characterization of a hybrid tunable integrated optical filter. It consists of a diffused ion-exchanged channel waveguide on a borosilicate glass substrate with a cover of the same glass to form a gap filled with a holographic grating. The grating morphology, called POLICRYPS (POlymer LIquid CRYstal Polymer Slices), is made of alternating stripes of polymer and liquid crystal acting as overlayer for the underneath waveguide. The filter structure includes aluminum coplanar electrodes to electrically control the grating properties, allowing the tunability of the filter. The electric driving power required to tune the filter obtained was in the range of submilliwatts due to the efficient liquid crystal electro-optic effect.

©2008 Optical Society of America

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Figures (5)
Fig. 1.
Fig. 1. Schematic of the optical filter using composite grating made of polymer and liquid crystal (POLICRYPS) over an ion-exchanged waveguide.

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Fig. 2.
Fig. 2. Microscope image of the POLICRYPS grating written over a 6 µm wide waveguide. The white arrows below indicate the orientations of the fast or ordinary (o) axis and of the extraordinary (e) or slow axis of the NLC.

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Fig. 3.
Fig. 3. Set-ups to measure the transmitted (a) and the reflected spectra (b) of the filter.

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Fig. 4.
Fig. 4. Transmitted (a) and reflected spectra (b) of the filter normalized with respect to the EDFA spectrum.

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Fig. 5.
Fig. 5. Overlapped reflected spectra obtained by varying the applied voltage, normalized with respect to the EDFA spectrum.

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Equations (1)

Equations on this page are rendered with MathJax. Learn more.

n LC ( θ ) = n e n o n 0 2 sin ⁡ 2 θ + n e 2 cos ⁡ 2 θ
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