Optical transmission path monitoring system, monitoring apparatus therefor and monitoring method therefor
US7496296B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 22, 2001 |
| Grant date | Feb 24, 2009 |
| Priority date | — |
| Expiry date | Feb 3, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/071
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Terminal equipment of a wavelength division multiplexing optical transmission system is provided with a monitoring apparatus for monitoring optical transmission paths with an OTDR. For this monitoring, OTDR probe lights of different wavelengths are allocated to optical fibers and optical amplifier-repeaters, which are elements constituting the optical transmission paths. Further, different wavelengths are allocated to OTDR probe lights between the up link and the downlink. Such a wavelength as makes the wavelength dispersion over the optical transmission paths negative (usually the shorter wavelength side than the zero dispersion wavelength of the optical transmission paths) is allocated to the OTDR probe light for optical fiber monitoring, and a wavelength longer than 1550 nm is allocated to the OTDR probe light for optical amplifier-repeater monitoring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.