Quasi-free-space optical coupling between diffraction grating couplers fabricated on independent substrates.
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.
Mulé
Anthony V
AV
Microelectronics Research Center, Georgia Institute of Technology, Atlanta, Georgia 30332-0269, USA. gt2925a@prism.gatech.edu
Villalaz
Ricardo
R
Gaylord
Thomas K
TK
Meindl
James D
JD