Apparatus and method for determining wavelength from coarse...

Details Apparatus and method for determining wavelength from coarse... Apparatus and method for determining wavelength from coarse...

2005-02-22

2005-02-22

Turner, Samuel A. (Department: 2877)

Optics: measuring and testing

By light interference

Having partially reflecting plates in series

Reexamination Certificate

active

06859284

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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