Compact optical time domain reflectometer having enhanced accuracy
US6594004B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 2001 |
| Grant date | Jul 15, 2003 |
| Priority date | — |
| Expiry date | Jun 9, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/3145
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A light branching section applies a light pulse emitted in synchronism with a drive pulse (DP), to an optical fiber line path, and receives the light returning from the line path. An A/D converter performs equivalent sampling on the optical signal contained in the returning light, in synchronism with the sampling pulse (SP) of period T0. A measuring control circuit (MCC) generates DP a number (M) of times. The circuit generates N number of SPs every time it outputs DP. It outputs the SPs, at a time delayed by &Dgr;T that corresponds to 1/M of the period T0. A clock signal generation circuit outputs to the MCC a first clock signal of a period T1 and a second clock signal of a period T2 different by &Dgr;t from the period T1. The MCC imparts a delay &Dgr;T to the SPs, on the basis of the &Dgr;t.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.