KEYWORDS: Control systems, Control systems design, Fiber amplifiers, Optical amplifiers, Optical fibers, Fiber lasers, Phase measurement, Negative feedback, Oscillators, High power fiber amplifiers
Combining fiber laser beams are of current interest for scaling lasers to high average output power. The Master
Oscillator Power Amplifier (MOPA) configuration is important in fiber laser beam combination. The efficiency of
coherent beam combining is depended on the phase control precision of the system mostly, which is equivalent to the
closed loop output phase noise. In this paper, a simplified negative feedback model of the phase control system is
constructed to study the optimum design of the system. The effects of the transfer function of the system on the phase
noise of the optical fiber amplifier, the measured noise and the stability of the system are analyzed. The relationship
between the closed loop output noise and the system parameters is analyzed and calculated. The results show that there is
a set of system parameters to minimize the closed loop output noise for different phase noise of the optical fiber amplifier,
and for a fixed set of system parameters, the closed loop output noise of the system almost changes linearly with the
change of the input noise. The effective means to achieve optimal system parameters for higher degree of control
precision are obtained.
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