Experimental Observation of Bright-Dark Pulse Emitting
in an All-Fiber Ring Cavity Laser¹

H. Y. Wang, W. C. Xu*, W. J. Cao, L. Y. Wang, and J. L. Dong

Key Laboratory of Photonic Information Technology of Guangdong Higher Education Institutes,
School of Information and Optoelectronic Science and Engineering, South China Normal University,
Guangzhou 510006, China

*e-mail: xuwch@scnu.edu.cn

Received July 27, 2011; in final form, August 23, 2011; published online November 28, 2011

Abstract—We demonstrate the emission of bright pulse and dark pulse in a simple all-fiber ring cavity laser
by using self-pulsing technique. The switching between bright pulse and dark pulse can be realized by properly
rotating the polarization controller (PC). Meanwhile, the bright-dark pulse can also be generated in the fiber
laser and is experimentally verified to be on two different orthogonal polarization axis of the cavity fiber. Our
experimental results show that the bright pulse, the dark pulse or the bright-dark pulse can be obtained in an all-
fiber laser by using self-pulsing technique.

10.1134/S1054660X12010239

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