Optical coupling between preferential-order volume diffraction grating couplers fabricated on independent substrates is demonstrated. The coupling efficiency between gratings is quantified as a function of both grating and waveguide fabrication technology and relative angular position of the two substrates. A maximum grating-to-grating coupling efficiency of 31% is reported for coupling between two nonoptimized, nonfocusing, unpatterned volume grating couplers.
© 2004 Optical Society of America
(050.7330) Diffraction and gratings : Volume gratings
(130.2790) Integrated optics : Guided waves
(200.4650) Optics in computing : Optical interconnects
(230.7380) Optical devices : Waveguides, channeled
Anthony V. Mulé, Ricardo Villalaz, Thomas K. Gaylord, and James D. Meindl, "Quasi-Free-Space Optical Coupling Between Diffraction Grating Couplers Fabricated on Independent Substrates," Appl. Opt. 43, 5468-5475 (2004)