Sensing a disturbance
US8027584B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 1, 2007 |
| Grant date | Sep 27, 2011 |
| Priority date | — |
| Expiry date | Jul 28, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/00
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a system for sensing of a disturbance on an optical link. Data traffic from an optical source with a short coherence length is transmitted along the link to a receiver station on one or more of a plurality of time-division-multiplexed channels. One of the channels is used to transmit encoded phase information relating to the phase characteristics of the optical source output. At the receiver station, the actual phase characteristics of the arriving light from the optical source is compared with the encoded phase information. Since a physical disturbance of the link is likely to alter the actual phase characteristics of the arriving light but not the encoded phase information, it is possible to determine if a physical disturbance has occurred. The system can conveniently be used to monitor an optical link carrying communications traffic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.