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15 October 2013 Characteristics research of self-amplified distributed feedback fiber laser
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Proceedings Volume 8924, Fourth Asia Pacific Optical Sensors Conference; 89240Y (2013)
Event: Asia Pacific Optical Sensors Conference 2013, 2013, Wuhan, China
A distributed feedback (DFB) fiber laser with a ratio of backward to forward output power of 1:100 was composed by a 45mm length asymmetrical phase-shifted fiber grating fabricated on 50mm erbium-doped photosensitive fiber. Forward output laser was amplified using a certain length of Nufern EDFL980-Hp erbium-doped fiber to absorb surplus pump power after the active phase-shifted fiber grating and get population inversion. Using OptiSystem software, the best fiber length of the EDFL to get the highest gain was simulated. In order to keep the amplified laser with narrow line-width and low noise, a narrow-band light filter consisted of a FBG with the same Bragg wavelength as the laser and an optical circulator was used to filter the ASE noise of the out-cavity erbium-doped fiber. The designed laser structure sufficiently utilized the pump power, a DFB fiber laser of 32.5mW output power, 11.5 kHz line width, and -87dB/Hz relative intensity noise (RIN) at 300mW of 980 nm pump power was brought out.
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Zhiqiang Song, Haifeng Qi, Jian Guo, Chang Wang, and Gangding Peng "Characteristics research of self-amplified distributed feedback fiber laser", Proc. SPIE 8924, Fourth Asia Pacific Optical Sensors Conference, 89240Y (15 October 2013);

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