We propose an optical coupling module, the micro-optical bench, designed for the purpose of completely passive alignment of optical components. The principle is for one to position a planar microlens array, semiconductor device submounts, and optical fibers by using reference planes and V grooves made on a Si substrate. A prototype was fabricated, and we achieved an optical coupling loss of less than 3 dB; small deviations among channels as low as 1 dB were achieved without any precise alignment. For multimode fibers, a coupling loss of approximately 0.5 dB was obtained.
© 1999 Optical Society of America
Yasuhiko Aoki, Toshio Kato, Rogerio Jun Mizuno, and Kenichi Iga, "Micro-Optical Bench for Alignment-Free Optical Coupling," Appl. Opt. 38, 963-965 (1999)