System and method for low coherence broadband quadrature interferometry
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United States of America Patent
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Mar 28, 2006
Grant Date -
Dec 2, 2004
app pub date -
May 28, 2004
filing date -
May 30, 2003
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Expired
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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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