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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 wave-guides. 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 ssuited to serve as the wavelength-selective element of a Mach-Zehnder add/drop filter.
By: D. Wiesmann, C. David, R. Germann, D. Erni, G.L. Bona
Published in: IEEE Photonics Technology Letters, volume , (no 6), pages 639-641 in 2000
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