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Apodized surface-corrugated gratings with varying duty cycles

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5 Author(s)
Wiesmann, D. ; Electron. Lab., Swiss Fed. Inst. of Technol., Zurich, Switzerland ; David, C. ; Germann, R. ; Emi, D.
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We present the first realization of a Bragg grating apodization based on a concatenation of different duty cycles. The gratings were fabricated in SiON planar waveguides. The reflected signal exhibits a sidelobe suppression better than -20 dB outside a bandwidth of 1.36 nm. At the same time the reflection is stronger than 99.9%, i.e., the resonant light is suppressed better than -30 dB in transmission over 0.22 nm. The gratings are perfectly suited to serve as the wavelength-selective element of a Mach-Zehnder add/drop filter.

Published in:

Photonics Technology Letters, IEEE  (Volume:12 ,  Issue: 6 )