System and method for low coherence broadband quadrature...

Details System and method for low coherence broadband quadrature... System and method for low coherence broadband quadrature...

2006-03-28

2006-03-28

Lee, Hwa (Andrew) (Department: 2877)

Optics: measuring and testing

By light interference

Using fiber or waveguide interferometer

C356S497000

Reexamination Certificate

active

07019838

ABSTRACT:
A quadrature broadband interferometry system and method obtains a complete complex interferometric signal instantaneously in both homodyne and heterodyne systems in a simple, compact, and inexpensive setup. This is accomplished by separating interferometric components from non-interferometric components in each of at least two detector signals of an interferometer having a number of N×N couplers, scaling the interferometric components, and generating real and imaginary parts of a complex interferometric signal from the scaled interferometric components. The detector signals preferably derive from a broadband light source coupled to the interferometer, and the number of N×N couplers may be one or more, with N≧3.

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Fiber Optic Sensors, Eric Udd, 1991, pp 284-294.
Zhao et al: “Real-time phase-resolved functional optical coherence tomography by use of optical Hilbert transformation,” Jan. 15, 2002, pp. 98-100, vol. 27, No. 2, Optics Letters, Optical Society of America.

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