An improved vertical coupling structure, consisting of a graded-index planar buried waveguide in glass and a dielectric overlayer, is designed and realized to provide an optimum edge coupling to a modeled GaAs photodetector. Calculations of the attenuation coefficient and coupling efficiency show an optimum absorption behavior. Normal-mode measurements and beam-propagation calculations of the coupling length and power transfer ratio are compared.
© 1995 Optical Society of America
Original Manuscript: May 22, 1995
Published: November 1, 1995
P. C. Noutsios and G. L. Yip, "Improved vertical directional coupler for optimum edge coupling to an embedded photodetector," Opt. Lett. 20, 2198-2200 (1995)