Fault monitoring system for optical fiber communication systems
US4899043A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1988 |
| Grant date | Feb 6, 1990 |
| Priority date | — |
| Expiry date | Jul 15, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2210/078
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A fault monitoring system for optical fiber communication system having a bidirectional optical amplifier between first and second optical fiber transmission lines. An optical monitoring signal of a first frequency different from frequencies of communication signal light of the optical fiber communication system is applied to the first input/output port of the bidirectional optical amplifier through the first optical fiber transmission line and then branched through a first optical filter passing therethrough of the first frequency to apply the branched optical monitoring signal of the first frequency to the second input/output port of the bidirectional amplifier. Another optical monitoring signal of a second frequency different from the first frequency and frequencies of the communication signal light is applied to the second input/output port of the bidirectional optical amplifier through the second optical transmission line and then branched through a second optical filter passing therethrough of the second frequency to apply the branched optical monitoring signal of the second frequency to the first input/output port of the bidirectional amplifier. A fault of the bidirectional …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.