Synthesizing ideal windowlike spectral response in codirectional grating-assisted couplers is considered. The method of variational optimization is used to design couplers theoretically with near 100% power transfer efficiency over the passband width and with sidelobes suppressed to −40 dB. The physical role of the π-phase-reversal sections for passband flattening is explained.
© 1996 Optical Society of America
Original Manuscript: January 16, 1996
Published: May 15, 1996
Brent E. Little, Chi Wu, and Wei-Ping Huang, "Synthesis of ideal window filter response in grating-assisted couplers," Opt. Lett. 21, 725-727 (1996)