Add-drop filter based on TiO2 coated shifted Bragg grating
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2016Author(s)
Paul Somnath
Vartiainen Ismo
Roussey Matthieu
Saastamoinen Toni
Tervo Jani
Honkanen Seppo
Kuittinen Markku
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10.1364/OE.24.026901Metadata
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Paul Somnath. Vartiainen Ismo. Roussey Matthieu. Saastamoinen Toni. Tervo Jani. Honkanen Seppo. Kuittinen Markku. (2016). Add-drop filter based on TiO2 coated shifted Bragg grating. OPTICS EXPRESS: THE INTERNATIONAL ELECTRONIC JOURNAL OF OPTICS, 24 (23) , 26901-26910. 10.1364/OE.24.026901.Rights
© 2016 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
Abstract
We present a titanium dioxide coated shifted Bragg grating in a silicon-on-insulator platform enabling optical add-drop functionality. The device works on the basis of mode conversion due to shifted sidewall structure followed by mode splitting based on an asymmetric Y-coupler. We experimentally demonstrate the working principle of the device. A reflection bandwidth of 2.2 nm with 14 dB extinction ratio is obtained with a 300 μm long shifted Bragg grating. The performance of the device is also compared without the titanium dioxide coating. A scope of spectral tunability with titanium dioxide re-coating (0.8 nm per 1 nm re-coating) by atomic layer deposition is experimentally verified.