The method of parallel end-butt coupling has been used to couple GaAs laser diodes to Ta2O5 thin film waveguides. Theoretical caluclations predict that a coupling efficiency into the lowest order waveguide mode of 90% is achievable if the thicknesses of the waveguide (t g ) and the laser light emitting layer (t L ) are equal. Experimentally, efficiencies as high as 45.1% have been measured for laser and waveguide combinations with t g /t L = 0.34. The tolerance to misalignment of the laser and waveguide has been theoretically and experimentally evaluated.
© 1977 Optical Society of America
Original Manuscript: August 5, 1976
Published: April 1, 1977
R. G. Hunsperger, A. Yariv, and A. Lee, "Parallel end-butt coupling for optical integrated circuits," Appl. Opt. 16, 1026-1032 (1977)