High Optical Coupling Scheme in LD Modules with Silicon Platform Technology (Special Issue On Devices, Packaging Technology, and Subsystems for the Optical Access Network)

概要

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Laser module fabricated with silicon platform technology is very attractive for low-cost modules. The technology enables passive optical alignment of an LD to an optical fiber. Our marker design for passive alignment allows positioning accuracy within ±1μm of LD. However, coupling efficiency is a key issue because that by conventional butt coupling scheme is low with about 10dB coupling loss. We investigated optical coupling characteristics in various types of coupling scheme: conventional flat end fibers, cone fibers, integrated GRIN rod lenses on the platform and the coupling with new-type LDs integrated with spot size transformer. Improvement of coupling efficiency with 3dB and 7.5dB compared to flat-end fiber is achieved by using the cone fiber and the GRIN rod lens, respectively, although 1-dB coupling tolerances for alignment deteriorated with these schemes. We obtained high efficient coupling with 3.5dB coupling loss and wide alignment tolerance of ±2.3μm simultaneously with a new-type LD integrated with spot size transformer owing to its expanded spot size characteristics.
社団法人電子情報通信学会の論文
1997-01-25