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A compact graphene Q-switched erbium-doped fiber laser using optical circulator and tunable fiber Bragg grating |
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| Authors: | Li He-Ping Xia Han-Ding Wang Ze-Gao Zhang Xiao-Xia Chen Yuan-Fu Zhang Shang-Jian Tang Xiong-Gui Liu Yong |
| Affiliation: | a School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China;b State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China |
| Abstract: | We demonstrate a passively Q-switched tunable erbium-doped fiber laser (EDFL) based on graphene as a saturable absorber (SA). A three-port optical circulator (OC) and a strain-induced tunable fiber Bragg grating (TFBG) are used as the two end mirrors in an all-fiber linear cavity. The Q-switched EDFL has a low pump threshold of 23.8 mW. The pulse repetition rate of the fiber laser can be widely changed from 9.3 kHz to 69.7 kHz by increasing the pump power from 23.8 mW to 219.9 mW. The minimum pulse duration is 1.7 μs and the highest pulse energy is 25.4 nJ. The emission wavelength of the laser can be tuned from 1560.43 nm to 1566.27 nm by changing the central wavelength of the strain-induced TFBG. |
| Keywords: | fiber lasers Q-switching wavelength tunable operation graphene saturable absorber |
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