System for measuring delay time variation in optical fiber digital communication system
US4764980A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1986 |
| Grant date | Aug 16, 1988 |
| Priority date | — |
| Expiry date | Jan 21, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/07
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Delay time variation in an optical fiber digital communication system which includes optical regenerative repeaters is measured at one of terminal ends having reference clock signal. A monitor signal which depends upon the delay time variation is provided at the farthest repeater in an area where delay time is subject to secular change by dividing reference clock signal from said terminal end, and said monitor signal is returned to the terminal end from said farthest repeater, and the terminal end compares the returned monitor signal with the divided reference signal by using a phase comparator to provide measure of delay time variation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.