Title :
DBR active optical filters: transfer function and noise characteristics
Author :
Kazovsky, Leonid G. ; Stern, Miklos ; Menocal, Serafin G., Jr. ; Zah, Chung-en
Author_Institution :
Bellcore, Redbank, NJ, USA
fDate :
10/1/1990 12:00:00 AM
Abstract :
A theoretical model of distributed Bragg reflector (DBR) active filters is presented and verified experimentally through measurements of the transfer function and the noise spectra. The theory allows simple yet accurate evaluation of the transmission transfer function and of the noise properties of this class of filters. A conventional DBR laser device used as a filter is shown, experimentally and theoretically, to have two drawbacks: a multilobe transfer function and small gain (less than 10 dB facet-to-facet). It is shown how both problems can be overcome via reduction of two key device parameters: the grating coupling coefficient and the physical length of the active and/or phase control sections. This technique can lead to devices with attractive properties, having a gain of 35 dB, sidelobe suppression of 32 dB, and bandwidth as narrow as 1 GHz
Keywords :
distributed Bragg reflector lasers; electron device noise; integrated optics; optical filters; optical transfer function; semiconductor junction lasers; 1 GHz; 35 dB; DBR active optical filters; DBR laser device; active section length; bandwidth; diffraction gratings; grating coupling coefficient; multilobe transfer function; noise characteristics; noise spectra; optical transfer function; phase control sections; sidelobe suppression; transmission transfer function; Active filters; Active noise reduction; Distributed Bragg reflectors; Filtering theory; Laser modes; Laser noise; Noise measurement; Optical filters; Optical noise; Transfer functions;
Journal_Title :
Lightwave Technology, Journal of
