Chromatic dispersion measuring system for optical fibers
US4799790A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 1988 |
| Grant date | Jan 24, 1989 |
| Priority date | — |
| Expiry date | Feb 24, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/41
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for measuring a chromatic dispersion of an optical fiber has a light signal transmitter and a light signal receiver. The transmitter has a modulation signal generating circuit for generating at least one modulation signal having a predetermined frequency, and synchronizing signal generating circuit for generating a synchronizing signal having a predetermined frequency. First adding circuit is provided for adding the synchronizing signal generated by the synchronizing signal generating circuit to the modulation signal generated by the modulation signal generatig circuit. The light signal receiver has first photoelectric converter for converting the reference optical signal into a reference electrical signal added with the synchronizing signal and second photoelectric converter for converting the measurement optical signal into a measurement electrical signal added with the synchronizing signal. The receiver also has a synchronizing signal regenerating circuit for generating a regenerated synchronizing signal at a predetermined timing, and local signal generating circuit for generating at least one local signal having a predetermined frequency. Second adding circuit is provi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.