期刊
OPTICS EXPRESS
卷 24, 期 17, 页码 19760-19768出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.24.019760
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资金
- Natural Science Foundation of Hebei Province [F2016201023]
- Youth Foundation of Hebei Educational Committee [QN2015235]
- Technology Foundation for Selected Overseas Chinese Scholar of MOHRSS [CG2015003006]
- Advanced Talents Program of Hebei Educational Committee [GCC2014020]
- Special Funding of Comprehensive Capability Enhancement Program from Hebei University
- International Science and Technology Cooperation Program of China [2014DFA12930]
High stability single- and dual-wavelength compound cavity erbium-doped fiber lasers (EDFLs) with ultra-narrow linewidth, high optical signal to noise ratio (OSNR) and widely tunable range are demonstrated. Different from using traditional cascaded Type1/Type-2 fiber rings as secondary cavities, we nest a Type-1 ring inside a Type-2 ring to form a passive subring cavity to achieve single-longitudinal-mode (SLM) lasing with ultra-narrow linewidth for the first time. We also show that the SLM lasing stability can be further improved by inserting a length of polarization maintaining fiber in the Type-2 ring. Using a uniform fiber Bragg grating (FBG) and two superimposed FBGs as mode restricting elements, respectively, we obtain a single-wavelength EDFL with a linewidth as narrow as 715 Hz and an OSNR as high as 73 dB, and a dual-wavelength EDFL with linewidths less than 1 kHz and OSNRs higher than 68 dB for both lasing wavelengths. Finally, by employing a novel self-designed strain adjustment device capable of applying both the compression and tension forces to the FBGs for wavelength tuning, we achieve the tuning range larger than 10 nm for both of the EDFLs. (C) 2016 Optical Society of America
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