Optical coupling equipment for an optical semiconductor and an optical fiber
US5392372A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1993 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Sep 27, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/4202
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Optical coupling equipment of the invention for an optical semiconductor and an optical fiber comprises a optical semiconductor, an optical fiber optically coupled to the semiconductor, and a refraction index matching substance filling the space between the semiconductor and the fiber. The refraction index matching substance has a refraction index greater than 1 and smaller than the refraction index of the core of the fiber. The optical distance between the ends of the semiconductor and the fiber with the ends of convex tip changes in association with the refraction index of the refraction index matching substance. In the differences in refraction index between the core of the fiber, as measured on the convex tip, and the outside decreases, the position of the focus of the convex tip changes. Furthermore, if the substances exists outside the active layer, the radiation angle of the laser diode also decreases. As a result, the distance between the facing ends which provides the highest coupling efficiency increases, compared to the equipment lacking the substance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.