Frequency scanned array control system

Details Frequency scanned array control system Frequency scanned array control system

2007-05-22

2007-05-22

Hughes, Deandra M. (Department: 3663)

Optical: systems and elements

Optical amplifier

Beam combination or separation

C359S337110

Reexamination Certificate

active

11254933

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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