Single-mode erbium fiber dual-ring laser with 60-nm workable wavelength tunability

•A widely tunable and stable SLM erbium-doped fiber ring laser is achieved.•The unpumped EDF-SA and dual-ring structure are used for side-mode suppression simultaneously.•The proposed dual-ring scheme can spread the bandwidth from 1520.0 to 1580.0 nm. In this investigation, to reach a widely wavelen...

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Bibliographic Details
Published in:Optics and laser technology 2019-06, Vol.114, p.16-19
Main Authors: Yang, Y.L., Yeh, C.H., Tsai, C.K., Xie, Y.R., Luo, C.M., Chang, Y.J., Chen, J.H., Chow, C.W.
Format: Article
Language:English
Subjects:
C band
C-band erbium
Doped fibers
Erbium
Fiber laser
Fiber lasers
Noise levels
Ring lasers
Ring structures
Single-longitudinal-mode (SLM)
Time travel
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Summary:•A widely tunable and stable SLM erbium-doped fiber ring laser is achieved.•The unpumped EDF-SA and dual-ring structure are used for side-mode suppression simultaneously.•The proposed dual-ring scheme can spread the bandwidth from 1520.0 to 1580.0 nm. In this investigation, to reach a widely wavelength-selectable and stable single-longitudinal-mode (SLM) erbium-doped fiber (EDF) ring laser, the unpumped EDF-based saturable absorber (SA) and dual-ring structure are used simultaneously for thickly multi-longitudinal-mode (MLM) suppression. The dual-ring scheme can spread the operation range of gain medium from 1520.0 to 1580.0 nm only by using a C-band erbium-doped fiber amplifier (EDFA). Moreover, the dual-ring scheme and EDF-based SA also could suppress the MLM noise for SLM oscillation. In the tuning range, the Lorentzian 3 dB linewidth is also obtained between 15 and 22 kHz in the wavelength range.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2019.01.025