Effect of Active Fiber Birefringence on Polarization Properties
of DBR All-Fiber Laser¹

F. Yang^{a, b}, Z. Q. Pan^a, Q. Ye^a, D. J. Chen^a, H. W. Cai^a, *, and R. H. Qu^a

^a Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine
Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

^b Graduate School of Chinese Academy of Sciences, Beijing 100039, China

*e-mail: hwcai@siom.ac.cn

Received November 8, 2011; in final form, November 19, 2011; published online March 6, 2012

Abstract—The polarization properties of a distribute Bragg reflective (DBR) all-fiber laser configured with a
common single mode high-reflectivity fiber Bragg grating (SM-FBG) and a polarization-maintaining fiber
Bragg grating (PM-FBG) are analyzed theoretically and investigated experimentally. Matching the reflective
peak of SM-FBG with one of the PM-FBG reflective peaks in an ideal active fiber (without birefringence)
would yield a linear polarization light. However, the polarization properties of a fiber laser become very com-
plex when a birefringence is induced into the active fiber. Different polarization properties (linear polarization,
elliptical polarization, or circular polarization) of the fiber laser appear with the variation of the birefringence.
Two perpendicular axes in the active fiber induced by the birefringence effect must be matched with that of
PMFBG to realize the linear polarization output.

10.1134/S1054660X12040287

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