High-output and low-noise optical fiber amplifier
US6028698A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1997 |
| Grant date | Feb 22, 2000 |
| Priority date | — |
| Expiry date | Nov 14, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S2303/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical fiber amplifier can maintain its optical power output above a level exceeding +20 dBm and a low noise figure if the input optical signal shows a high power level. It comprises a front stage amplifying optical fiber 11 doped with a rare-earth element and arranged in a front stage 10A thereof and a back stage amplifying optical fiber 12 also doped with a rare-earth element and arranged in a back stage 10B thereof, wherein the front stage amplifying optical fiber 11 is provided at the signal light input terminal 13 thereof with a first optical coupler 14 for coupling signal light and excitation light in a same direction and at the signal light output terminal 15 thereof with a second optical coupler 16 for coupling signal light and excitation light in opposite directions and the back stage amplifying optical fiber 12 is provided at the signal light input terminal 19 thereof with a third optical coupler 21 for coupling signal light and excitation light in opposite directions, the first, second and third optical couplers 14, 16 and 21 being connected respectively to a first excitation light source 17 for generating excitation light with the 1,480 nm wavelength, a second excit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.