Optical fiber coupling part
US7346237B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2004 |
| Grant date | Mar 18, 2008 |
| Priority date | — |
| Expiry date | Sep 28, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/2551
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical fiber coupling part capable of reducing coupling loss while maintaining a large operating distance, and having a good module assembling property. AT least one GRIN lens having numerical aperture NA that is larger than numerical aperture NAs of a light-emitting source (such as a semiconductor laser) is fusion-spliced with one end of the optical fiber. All lights emitted from the light-emitting source can enter the GRIN lens, and the loss of the light can thereby be reduced. In addition, a second GRIN lens having numerical aperture NA2 is fusion-spliced with one end of the optical fiber having numerical aperture NAf, and further a first GRIN lens having numerical aperture NA1, which is larger than numerical aperture NA2, is fusion-spliced with the other end of the second GRIN lens. Thereby, the light emitted from the light-emitting source can efficiently enter the optical fiber, and loss of the light can thereby be reduced. In this case, the formula expressed by NAf≦NA2<NAs≦NA1 is desirable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.