Signal detection method and optical time-domain reflectometer
US12181370B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 2022 |
| Grant date | Dec 31, 2024 |
| Priority date | — |
| Expiry date | Apr 12, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/071
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical time-domain reflectometer (OTDR), where a laser emitting apparatus of the OTDR outputs a first optical signal in a first time period. A signal modulation apparatus of the OTDR generates a pulse signal based on the first optical signal, and outputs the pulse signal to an optical fiber in a second time period, where the first time period includes the second time period. A receiver of the OTDR receives a scattered signal from the optical fiber, where a frequency of the scattered signal is the same as a frequency of the first optical signal. Then, the laser emitting apparatus outputs a second optical signal in a third time period, where a frequency of the second optical signal is different from the frequency of the first optical signal. The second optical signal is used as a local oscillator signal to implement coherent detection in the receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.