System and method for low coherence broadband quadrature interferometry
First Claim
1. A signal processing method, comprising:
- 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.
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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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Citations
67 Claims
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1. A signal processing method, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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17. The method of claim 17, further comprising:
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estimating reflector velocity based on
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29. An analyzer, comprising:
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an interferometer including at least one fiber-optic coupler;
a number of detectors that detect light from said at least one coupler; and
a processor which acquires interferometric components from signals output from the detectors, scales the interferometric components, and generates real and imaginary parts of a complex interferometric signal from the scaled interferometric components. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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52. A method for performing optical coherence tomography, comprising:
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generating a complex interferometric signal; and
instantaneously recovering Doppler shift information from the complex interferometric signal. - View Dependent Claims (53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67)
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Specification