Method and apparatus for dispersion measurement
US6614515B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 2002 |
| Grant date | Sep 2, 2003 |
| Priority date | — |
| Expiry date | Oct 7, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/3163
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of measuring dispersion in an optical fiber from one end is disclosed. An optical measurement signal comprising timed pulses is input into one end of the fiber, and a small loop is formed at the point to which total dispersion is to be measured. In one embodiment the loop is formed so as to increase the amount of detectable light that escapes the fiber at the loop, and the escaping light pulses are monitored by a free space detector. The wavelength of the optical measurement signal is varied, and the change in propagation delay of the detected optical pulses is measured, thus indicating the dispersion. In a second embodiment the loop is formed so as to increase the amount of loss in the optical measurement signal, and an OTDR is utilized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.