A complete theoretical analysis of a modified grating-frustrated coupler with a second grating in the input channel is presented. We show that this second grating allows for a reduction to zero of backreflected light and transmits all the radiation near the Bragg wavelength to a drop port.
© 2001 Optical Society of America
Ararat Yesayan and Réal Vallée, "Optimized grating-frustrated coupler," Opt. Lett. 26, 1329-1331 (2001)