Coherent phase and frequency detection using sum-frequency mixin

Optics: measuring and testing – By particle light scattering – With photocell detection

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356349, 356351, 356354, G01B 902

Patent

active

053879724

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.

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