Apodized surface-corrugated gratings with varying duty cycles
- Resource Type
- Periodical
- Authors
- Wiesmann, D.; David, C.; Germann, R.; Emi, D.; Bona, G.L.
- Source
- IEEE Photonics Technology Letters IEEE Photon. Technol. Lett. Photonics Technology Letters, IEEE. 12(6):639-641 Jun, 2000
- Subject
- Engineered Materials, Dielectrics and Plasmas
Photonics and Electrooptics
Bragg gratings
Electromagnetic waveguides
Planar waveguides
Etching
Laboratories
Semiconductor waveguides
Corrugated surfaces
Bandwidth
Filters
Wide area networks
- Language
- ISSN
- 1041-1135
1941-0174
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.