Method and device for monitoring an optical transmission line, especially an optical transmission line to an end subscriber of a transmission network
US7778544B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 2006 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | May 22, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/0771
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method for monitoring an optical transmission line in which digital optical signals are transmitted bidirectionally between a first and a second end point of the transmission line. At the first end point of the transmission line the digital optical signal to be transmitted to the second end point is amplitude-modulated with a preset frequency, with the modulation amplitude being small relative to the amplitude of the digital signal. At the second end point of the transmission line a small fraction of the power of the received digital signal is overcoupled passively on the optical transmission line in the direction towards the first end point and is transmitted to the first end point together with the digital signal to be transmitted from the second end point to the first end point of the optical transmission line. At the first end point the amplitude-modulated component of the received digital signal is detected. An interruption in the optical transmission line is determined when the power of the amplitude-modulated component or an associated optical or electrical characteristic parameter is smaller than a preset limit value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.