Multi-span optical communications link having remote optically pumped amplifier
US9735532B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2015 |
| Grant date | Aug 15, 2017 |
| Priority date | — |
| Expiry date | Mar 4, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/2916
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A remote optically pumped amplifier in a multi-span optical communications link. A backwards Raman pump module performs backwards Raman amplification in an optical communications span that contains the remote optically pumped amplifier. A residual amount of backwards Raman pump power is then used to power the remote optically pumped amplifier. The remote optically pumped amplifier may be located 40 to 120 kilometers in optical distance from the backwards Raman pump module such that at least three milliwatts of residual Raman pump power is received by the remote optically pumped amplifier. The Raman pump module may be a multi-pump Raman pump module. A controller controls pump power provided by at least one of the pumps of the backwards Raman pump module, so as to at least partially compensate for optical signal strength versus wavelength variation introduced by the remote optically pumped amplifier and the backwards Raman pump module.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.