Optical phase measurement of target

Details Optical phase measurement of target Optical phase measurement of target

2006-04-11

2006-04-11

Healy, Brian (Department: 2883)

Optical waveguides

Integrated optical circuit

C385S011000, C385S012000, C356S433000, C356S432000

Reexamination Certificate

active

07027676

ABSTRACT:
Optical phase detection includes generating a first lightwave having a first polarization and a second lightwave having a polarization that is offset from the first polarization, and imposing a relative delay between the first and second lightwaves. The relative delay causes a frequency offset between the lightwaves as wavelength is tuned over a designated wavelength range. Directing the first and second lightwaves to a target provides a third lightwave and a fourth lightwave. A polarization component of the third lightwave and a polarization component of the fourth lightwave are detected to provide a detected signal at the frequency offset. The optical phase detection then includes extracting a phase difference, induced by the target, between the polarization components of the third and the fourth lightwaves.

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