Method and apparatus for controlling a fiber optic phased array utilizing frequency shifting
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United States of America Patent
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Nov 2, 2004
Grant Date -
Jul 29, 2004
app pub date -
Jan 24, 2003
filing date -
Jan 24, 2003
priority date (Note) -
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Abstract
A fiber optic phased array, as well as associated methods and apparatus for controllably adjusting the frequency of the optical signals emitted by a fiber optic phased array, are provided that permit wide band phase control and may be implemented utilizing conventional analog electronics. In this regard, the method and apparatus can independently control the phase of the optical signals propagating through each fiber optic amplifier of the fiber optic phased array, even as large optical phase disturbances occur. As such, the control method and apparatus permit a fiber optic phased array to generate a flat phase front that, in turn, can provide a diffraction limited output laser beam. Alternatively, the control method and apparatus may be designed such that the output signals emitted by an array of fiber optic amplifiers has any other desired phase front, such as to compensate for atmospheric perturbations or the like.
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