Apparatus and method for determining wavelength from coarse and fine measurements
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United States of America Patent
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Feb 22, 2005
Grant Date -
Jun 3, 2004
app pub date -
Dec 2, 2002
filing date -
Dec 2, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides an apparatus for determining a wavelength of an optical signal by determining a coarse wavelength response and a fine wavelength response. The coarse wavelength response is achieved by utilizing an optical filter. A suitable detector detects the wavelength-dependent response and conveys the determined coarse wavelength response to the processing logic. The fine wavelength response is achieved by utilizing an interferometer that is capable of generating an interference pattern. Two detectors are disposed in the interference pattern at a quadrature separation from each other and detect the intensity responses at their respective locations. The intensity responses are conveyed to a unit that determines the fine wavelength response. Finally, the processing logic determines the wavelength utilizing the determined coarse wavelength response and the determined fine wavelength response.
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