Spectral phase measurement using phase-diverse coherent...

Details Spectral phase measurement using phase-diverse coherent... Spectral phase measurement using phase-diverse coherent...

2006-05-30

2006-05-30

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By light interference

Having light beams of different frequencies

Reexamination Certificate

active

07054012

ABSTRACT:
Embodiments in accordance with the invention provide an optical spectrum analyzer. The optical spectrum analyzer includes a receiver for receiving an optical local oscillator signal and an unknown optical signal. The receiver outputs three or more phase-diverse heterodyne signals. The phase-diverse heterodyne signals are coupled to a phase quadrature generator. The phase quadrature generator produces a first and second phase quadrature signals that are ninety degrees out of phase with respect to each other. The first and second phase quadrature signals are coupled to a complex signal generator. The complex signal generator produces a complex signal having a positive and negative image. A measurement processing unit determines the phase of the unknown optical signal from the relative difference of the phase of the positive and negative image of the complex signal.

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Kazovsky, Leonid G., “Phase- and Polarization-Diversity Coherent Optical Techniques.” Feb., 1989, Journal of Lightwave Technology, vol. 7, No. 2. pp. 279-292.
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European Search Report Dated: Apr. 5, 2005.

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