Bandpass engineering of lithographically scribed channel-waveguide Bragg gratings.
We propose and demonstrate a powerful approach to spectral bandpass engineering (apodization) of one-dimensional channel-waveguide Bragg reflectors. Bandpass engineering is accomplished by precise photolithographic control of the length and the longitudinal placement of individual grating lines, which provides unique line-by-line diffractive amplitude and phase control. Channel-waveguide gratings that exhibit complex filtering functions have been fabricated and modeled. When a second-order apodization effect that comprises effective waveguide refractive-index variation with grating-line length is included in the simulation, extraordinary agreement between predicted and observed spectral passband profiles is obtained.
Greiner
Christoph
C
LightSmyth Technologies, Inc., Suite 250, 860 West Park Street, Eugene, Oregon 97041, USA. cgreiner@lightsmyth.com
Mossberg
Thomas W
TW
Iazikov
Dmitri
D