Key Laboratory of Optical Fiber Sensing Technology of Shandong

Jinan, China

Key Laboratory of Optical Fiber Sensing Technology of Shandong

Jinan, China
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Song Z.-Q.,Key Laboratory of Optical Fiber Sensing Technology of Shandong | Qi H.-F.,Key Laboratory of Optical Fiber Sensing Technology of Shandong | Guo J.,Key Laboratory of Optical Fiber Sensing Technology of Shandong | Wang C.,Key Laboratory of Optical Fiber Sensing Technology of Shandong | Peng G.-D.,University of New South Wales
Guangzi Xuebao/Acta Photonica Sinica | Year: 2014

A distributed feedback (DFB) fiber laser with a ratio of backward to forward output power of 100:1 was composed by a 45mm length asymmetrical phase-shifted fiber grating fabricated on erbium-doped photosensitive fiber. Forward output laser was amplified and population inversion was got by using a certain length of Nufern EDFL980-Hp erbium-doped fiber to absorb surplus pump power after the active phase-shifted fiber grating. 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 fiber grating 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, and a fiber laser of 32.5 mW output power, 11.5 kHz line width, and -87 dB/Hz relative intensity noise (RIN) at 300 mW of 980 nm pump power was gave.


Lv J.,Key Laboratory of optical fiber sensing technology of Shandong | Zhang X.,Key Laboratory of optical fiber sensing technology of Shandong | Qi H.,Key Laboratory of optical fiber sensing technology of Shandong | Guo J.,Key Laboratory of optical fiber sensing technology of Shandong | And 3 more authors.
Photonic Sensors | Year: 2015

A fabrication method of the multi-wavelength fiber grating (FBG) was introduced. Using the scan exposure method, the multi-wavelength FBG can be successfully manufactured through applying different tensile forces during the multiple exposures process on the same fiber. Experiment results show that the position and the overlap of different sub FBGs will greatly affect the spectrum of every sub FBG. The spectrum of each sub FBG will be affected by short wave oscillation unless the lengths and positions of all sub FBGs are fully overlapped. For hydrogen loaded fiber, the wavelength and reflectivity of the nth level FBG will increase as the (n+1)th level FBG is written. But for germanium doped photosensitive fiber, multiple exposure will increase the wavelength of previous sub FBGs while decrease the reflectivity of all sub FBGs. Through well distributing exposure intensity of every sub FBGs, a four-wavelength FBG with same sub FBG’s spectrum was fabricated on a hydrogen loaded single mode fiber. © 2015, The Author(s).


Song Z.,Key Laboratory of Optical Fiber Sensing Technology of Shandong | Qi H.,Key Laboratory of Optical Fiber Sensing Technology of Shandong | Guo J.,Key Laboratory of Optical Fiber Sensing Technology of Shandong | Wang C.,Key Laboratory of Optical Fiber Sensing Technology of Shandong | Peng G.,University of New South Wales
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

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. © 2013 SPIE.

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