Title :
Narrow-band optical channel-dropping filter
Author :
Haus, Hermann A. ; Lai, Y.
Author_Institution :
MIT, Cambridge, MA, USA
fDate :
1/1/1992 12:00:00 AM
Abstract :
Waveguide couplers are combined with λ/4 shifted distributed feedback (DFB) resonators to produce narrowband channel dropping filters. The bandwidth of the filter can be made much narrower than the stopband of the grating. It is possible to remove the spurious responses of the grating filter by appropriate dispersion characteristics for the coupled waveguides. However, in some practical applications it may not be necessary to do this, if all channels can be accommodated within half the grating bandwidth of the filters
Keywords :
diffraction gratings; feedback; integrated optics; optical communication equipment; optical dispersion; optical filters; optical resonators; optical waveguides; λ/4 shifted; DFB resonators; coupled waveguides; dispersion characteristics; distributed feedback; filter bandwidth narrowing; filter grating half bandwidth; grating filter; grating stopband; narrowband channel dropping filters; optical channel-dropping filter; optical couples; spurious responses; waveguide couplers; Bandwidth; Couplers; Distributed feedback devices; Gratings; Narrowband; Optical feedback; Optical filters; Optical resonators; Optical waveguides; Resonator filters;
Journal_Title :
Lightwave Technology, Journal of
