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Published February 1, 2009 | Published
Journal Article Open

Adiabaticity criterion and the shortest adiabatic mode transformer in a coupled-waveguide system


By analyzing the propagating behavior of the supermodes in a coupled-waveguide system, we have derived a universal criterion for designing adiabatic mode transformers. The criterion relates ε, the fraction of power scattered into the unwanted mode, to waveguide design parameters and gives the shortest possible length of an adiabatic mode transformer, which is approximately 2/πε^(1/2) times the distance of maximal power transfer between the waveguides. The results from numerical calculations based on a transfer-matrix formalism support this theory very well.

Additional Information

© 2009 Optical Society of America. Received October 8, 2008; revised December 7, 2008; accepted December 8, 2008; posted December 12, 2008 (Doc. ID 102559); published January 26, 2009. This work was supported by Defense Advanced Research Projects Agency (DARPA) MTO office (J. Shah) under contract N66001-07-1-2058.

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