Abstract To obtain the stable operation of erbium-doped fibre laser, the simple and ideal technology is adopted by use of the erbium doped polarization maintaining fibre (EDPMF). The design criteria of the Panda-type EDPMF are presented, which take into account the cutoff wavelength, mode field diameter, modal birefringence and background loss. Four groups of optimum structural parameter combinations are determined in terms of the design criteria. Two kinds of the Panda-type EDPMFs are selected to be fabricated. The fabrication process and the parameter control of the Panda-type EDPMFs are presented in detail. Their refractive index profiles, birefringence and absorption spectra are experimentally investigated. The absorption coefficient of the EDPMF, whose core is co-doped with Bi, Ga, Al and Ge, is about 57.9dB/m at 1.53$\mu$m. Co-doping Bi, Ga and Al can greatly increase the erbium concentration in the silica-based fibre. The high birefringence is obtained for the Panda-type EDPMF. The group birefringence of the EDPMF, whose outer cladding diameter is 125$\mu$m, is about 4.8$\times$10-4.
Received: 28 April 2006
Revised: 10 August 2006
Accepted manuscript online:
Fund: Project supported by the National High Technology Research and Development Program of China (Grant Nos 2002AA312190 and 2004AA31g200).
Cite this article:
Zheng Kai(郑凯), Chang De-Yuan(常德远), Fu Yong-Jun(傅永军), Wei Huai(魏淮), Wei Yan(卫延), Yan Feng-Ping(延凤平), Lou Shu-Qin(娄淑琴), Ning Ti-Gang(宁提纲), Jian Wei(简伟), and Jian Shui-Sheng(简水生) Design and fabrication of Panda-type erbium-doped polarization-maintaining fibres 2007 Chinese Physics 16 478
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