An analysis of asymmetric directional couplers consisting of two parallel slab waveguides has been performed using the improved coupled-mode theory for multimode waveguides. The use of such couplers for multibranch power dividers has been illustrated, and the expected performances have been discussed, both for a two-branch divider and a three-branch one. One notes in particular the high SNR and efficiency at the end of the coupling region.
© 1989 Optical Society of America
Yaacov Shama, Emanuel Marom, and Amos Hardy, "Analysis of power transfer in nonsymmetric directional couplers," Appl. Opt. 28, 990-994 (1989)