We show that the resonantly enhanced absorption predicted for conventional vertically coupled waveguide photodetectors by steady-state eigenanalysis can overestimate detector absorption (waveguide-to-detector coupling efficiency) owing to modal power nonorthogonality.
© 1992 Optical Society of America
R. J. Deri, E. C. M. Pennings, and R. J. Hawkins, "Quenching of resonantly enhanced absorption by multimode interference in vertically coupled waveguide photodetectors," Opt. Lett. 17, 667-669 (1992)