Polarization-multiplexed, dual-comb all-fiber mode-locked laser
Mode-locked fiber lasers that can simultaneously generate two asynchronous ultrashort pulse trains could play an attractive role as the alternative light sources for low-complexity dual-comb metrology applications. Although a few multiplexing schemes to realize such lasers have been proposed and demonstrated, here we investigate the lasing characteristics of a passively mode-locked fiber laser with a finite amount of intracavity birefringence. By introducing a section of polarization-maintaining (PM) fiber into the otherwise-non-PM-single-mode cavity, dual asynchronous pulses with nearly orthogonal states of polarization are generated. With a repetition rate difference of hundreds of hertz, the pulses have well-overlapped spectra and show typical features of polarization-locked vector solitons. It is demonstrated that under an anomalous or net normal dispersion regime, either dual vector solitons or dual dissipative vector solitons can be generated, respectively. Such polarization-multiplexed single single-cavity dual-comb lasers could find further uses in various applications in need of simple dual-comb system solutions.
基金项目：Fundamental Research Funds for the Central Universities; National Natural Science Foundation of China (NSFC)10.13039/501100001809 (61435002, 61521091, 61675014, 61675015, 61705236).
Ting Li：School of Electronic and Information Engineering, Beihang University, Beijing 100083, China
Ya Liu：School of Electronic and Information Engineering, Beihang University, Beijing 100083, ChinaYunnan Key Laboratory of Opto-Electronic Information Technology, School of Physics and Electronic Information Technology, Yunnan Normal University, Kunming 650500, China
Qian Li：School of Electronic and Information Engineering, Beihang University, Beijing 100083, China
Zheng Zheng：School of Electronic and Information Engineering, Beihang University, Beijing 100083, ChinaBeijing Advanced Innovation Center for Big Data-Based Precision Medicine, Beihang University, Beijing 100083, ChinaCollaborative Innovation Center of Geospatial Technology, Wuhan 430079, China
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Xin Zhao, Ting Li, Ya Liu, Qian Li, and Zheng Zheng, "Polarization-multiplexed, dual-comb all-fiber mode-locked laser," Photonics Research 6(9), 853-857 (2018)