All-fiber passively mode-locked laser using nonlinear multimode interference of step-index multimode fiber
We experimentally demonstrate for the first time, to the best of our knowledge, an all-fiber passively mode-locked laser operation based on the nonlinear multimode interference of step-index multimode fiber. Such a structure couples the light in and out of the multimode fiber via single-mode fibers, and its physical mechanisms for saturable absorption have been analyzed theoretically based on the third-order nonlinear Kerr effect of multimode fiber. Using the nonlinear multimode interference structure with 48.8 mm length step-index multimode fiber, the modulation depth has been measured to be ～5%. The passively mode-locked laser output pulses have a central wavelength of 1596.66 nm, bandwidth of 2.18 nm, pulsewidth of ～625 fs, and fundamental repetition rate of 8.726 MHz. Furthermore, the influence of total cavity dispersion on the optical spectrum, pulse width, and output power is investigated systematically by adding different lengths of single-mode fiber and dispersion compensation fiber in the laser cavity.
基金项目：National Natural Science Foundation of China (NSFC)10.13039/501100001809 (11547187); Shandong Provincial Key RD Program (2017CXGC0416); Natural Science Foundation of Shandong Province10.13039/501100007129 (ZR2016FB17, ZR2017MA047).
Qiaoli Zhang：School of Physics and Technology, University of Jinan, Jinan 250022, China
Yaping Zhang：School of Physics and Technology, University of Jinan, Jinan 250022, China
Xin Li：School of Physics and Technology, University of Jinan, Jinan 250022, China
Haikun Zhang：School of Physics and Technology, University of Jinan, Jinan 250022, China
Wei Xia：School of Physics and Technology, University of Jinan, Jinan 250022, Chinae-mail: firstname.lastname@example.org
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Tao Chen, Qiaoli Zhang, Yaping Zhang, Xin Li, Haikun Zhang, and Wei Xia, "All-fiber passively mode-locked laser using nonlinear multimode interference of step-index multimode fiber," Photonics Research 6(11), 1033-1039 (2018)