Bi-directional long haul/ultra long haul optical communication link
US7346280B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2002 |
| Grant date | Mar 18, 2008 |
| Priority date | — |
| Expiry date | Jun 24, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/0241
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A bi-directional configuration is employed to implement a hybrid ultra long haul (ULH)/long haul (LH) optical transmission system. The link carries ULH channels and LH channels in opposite directions in different bands. Raman amplification is employed for the ULH band while Erbium-doped fiber amplification (EDFA) is used for both the LH and ULH bands. Optical circulators are employed for multiplexing and demultiplexing. This solution does not incur the ripple penalty of prior art solutions based on interferential filters while providing excellent isolation between the ULH and LH channels and bi-directional communication within a single fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.