Title :
Apodized surface-corrugated gratings with varying duty cycles
Author :
Wiesmann, D. ; David, C. ; Germann, R. ; Emi, D. ; Bona, G.L.
Author_Institution :
Electron. Lab., Swiss Fed. Inst. of Technol., Zurich, Switzerland
fDate :
6/1/2000 12:00:00 AM
Abstract :
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.
Keywords :
Bragg gratings; optical communication equipment; optical images; optical planar waveguides; optical waveguide filters; silicon compounds; Bragg grating apodization; Mach-Zehnder add/drop filter; SiON; SiON planar waveguides; apodized surface-corrugated gratings; duty cycle concatenation; reflected signal; resonant light suppression; sidelobe suppression; varying duty cycles; wavelength-selective element; Bandwidth; Bragg gratings; Corrugated surfaces; Electromagnetic waveguides; Etching; Filters; Laboratories; Planar waveguides; Semiconductor waveguides; Wide area networks;
Journal_Title :
Photonics Technology Letters, IEEE
