Monitor unit for monitoring an optical waveguide
US5485296A · kind A · utility
11Cited by
15References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1994 |
| Grant date | Jan 16, 1996 |
| Priority date | — |
| Expiry date | Apr 15, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/07953
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A monitor unit for detecting physical interference of a communications fibre in a transmission system includes a monitor circuit coupled to the communications fibre. A portion of a signal being transmitted along the communications fibre is coupled out of the fibre and into the monitor unit. A filter allows only one of two orthogonal polarization field components to pass through it to the monitor circuit. By detecting fluctuations in the polarization state of the filtered optical signal, the monitor circuit allows the detection of external influences to be determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.