Low-coherence reflectometer with polarization control
US6775005B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 25, 2002 |
| Grant date | Aug 10, 2004 |
| Priority date | — |
| Expiry date | Nov 2, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/3181
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A photocoupler 3 splits the light from a low-coherence light source 1 into measuring light DL and local oscillator light KL. A photocoupler 5 receives measuring light DL arid is input to an optical circuit 7 to be measured. The photocoupler 5 splits the reflected light RL. A polarization controller 9 controls the state of polarization of the reflected light RL as split by the photocoupler 5. A photocoupler 13 allows local oscillator light KL to be incident on a reflector mirror 16 and splits local oscillator light KL. A photocoupler 11 combines the reflected light RL as controlled in the state of polarization by the polarization controller 9, with the local oscillator light KL.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.