Fiber coupling enhancement via external feedback
US6707832B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 23, 2002 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | Dec 23, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/1089
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides for the coupling of laser diodes into electromagnetic radiation transmitting fibers wherein coupling efficiency is improved by improving the spatial brightness of multi-mode diode lasers as they are coupled into double-clad fibers. A Bragg grating 100 is fabricated into the core 102 of a double-clad fiber 104 coupled to a multi-mode diode laser 106. The output 108 from the multi-mode diode laser 106 is coupled into the core 102 and inner cladding 110 of the double-clad fiber by proximity or by one or more focusing objectives 112. The Bragg grating 100 in the core 102 of the double-clad fiber 104 is written at the wavelength of the multi-mode diode laser 106. The original output 108 from the multi-mode diode laser 106 strikes the Bragg grating 100 which reflects feedback 114 back to the diode laser 106.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.