We report on the fabrication and experimental demonstration of optical mode size transformation between standard single-mode fiber and 0.26μm-thick Si-waveguide by 12μm-thick Si/SiO2 multilayer on-chip GRIN lens of lengths 16μm or 24μm butt-joint to 10μm-wide terminated Siwaveguide. The overall coupling loss of the coupler was measured to be 3.45dB in which the Fresnel reflection loss is estimated to be 2dB at the GRIN-lens/air interface. The on-chip integrated GRIN lens opens up the feasibility of a low cost passive aligned fiber-pigtailed electronic-photonics integrated circuits platform.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics