Coherent Beam Combining of Fiber Amplifier Based on Adaptive
Polarization and Active Phase Control¹

Y. P. Xiong, X. Li*, R. T. Su, Y. X. Ma, X. L. Wang, P. Zhou, and X. J. Xu**

College of Optoelectric Science and Engineering, National University of Defense Technology,
Changsha, Hunan, 410073 China

*e-mail: crazy.li@163.com

**e-mail: xuxj@21cn.com

Received April 8, 2012; in final form, May 27, 2012; published online September 3, 2012

Abstract—Coherent beam combining (CBC) of a polarization-maintaining fiber amplifier and a non-polariza-
tion-maintaining fiber amplifier is presented. The experiment is based on adaptive polarization control and
active phase control. The stochastic parallel gradient decent (SPGD) algorithm is used for the adaptive polar-
ization control in the non-polarization-maintaining fiber amplifier and the active phase control is realized by
single frequency dithering (SFD) algorithm. When the adaptive polarization control system and the phase con-
trol system go into closed loop, the fringe contrast of far-field intensity pattern is improved to more than 87.7%.
A scalable architecture for CBC of two styles fiber amplifiers is also proposed.

DOI: 10.1134/S1054660X1210026X

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