Optical Phase Detectors
Phase detectors are also known in optics as interferometers. For pulsed (amplitude modulated) light, it is said to measure the phase between the carriers. It is also possible to measure the delay between the envelopes of two short optical pulses by means of cross correlation in a nonlinear crystal. And it is possible to measure the phase between the envelope and the carrier of an optical pulse, by sending a pulse into an nonlinear crystal. There the spectrum gets wider and at the edges the shape depends significantly on the phase.
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