Frequency scanned array control system
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United States of America Patent
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May 22, 2007
Grant Date -
Apr 19, 2007
app pub date -
Oct 19, 2005
filing date -
Oct 19, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
An optical fiber amplifier array and related method, in which high beam quality is achieved by varying the frequency of an input signal applied to all of the fiber amplifiers, to locate a frequency at which the amplifiers produce nearly coherent optical outputs. In spite of statistical variations in length and other factors among the fibers, there are frequencies at which the amplifiers produce nearly coherent outputs. In the control system of the invention, the input signal frequency is scanned across a selected narrow range and the beam quality is monitored by measuring on-axis far-field output beam intensity. The frequency is scanned until the beam intensity exceeds a selected threshold, and then the frequency is held constant until the beam intensity falls below a second selected threshold.
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