Coherent phase and frequency detection using sum-frequency mixing in non-linear waveguides
US5387972A · kind A · utility
4Cited by
7References
14Claims
0Family size
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Key dates
| Filing date | Mar 15, 1993 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | Mar 15, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J9/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A plurality of signals are mixed in a non-linear waveguide for generating a near field sum frequency output pattern. The near field output pattern is monitored for changes which correspond to changes in the phase relationship between the plurality of signals. A grating provides a mask through which the near field pattern may propagate. Detectors positioned above the grating at predetermined locations measure the intensity of the near field pattern and a change in the phase relationship between the input signals is determined from a change in the intensity of the near field output pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.