Switchable 0.612-nm-Spaced Dual-Wavelength Fiber Laser With Sub-kHz Linewidth, Ultra-High OSNR, Ultra-Low RIN, and Orthogonal Polarization Outputs

A high-performance switchable 0.612-nm-spaced dual-wavelength erbium-doped fiber (EDF) laser is proposed and experimentally demonstrated. For the first time, we combine a compound-cavity structure (CCS) and an enhanced polarization hole burning (PHB) effect in laser cavity to obtain stable dual-wave...

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Bibliographic Details
Published in:Journal of lightwave technology 2019-07, Vol.37 (13), p.3173-3182
Main Authors: Ting Feng, Mingming Wang, Xichen Wang, Fengping Yan, Yuping Suo, Yao, X. Steve
Format: Article
Language:English
Subjects:
Birefringence
Bragg gratings
Dependence
Doped fibers
Erbium
Erbium-doped fiber lasers
Fiber lasers
Hole burning
Lasers
Lasing
Linewidth
Noise levels
Optical communication
optical fiber laser
Optical fiber polarization
Optical noise
Optical polarization
optical signal to noise ratio
Polarization
relative intensity noise
Signal to noise ratio
Wavelengths
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Summary:A high-performance switchable 0.612-nm-spaced dual-wavelength erbium-doped fiber (EDF) laser is proposed and experimentally demonstrated. For the first time, we combine a compound-cavity structure (CCS) and an enhanced polarization hole burning (PHB) effect in laser cavity to obtain stable dual-wavelength lasing (λ1 and λ2) and single-longitudinal-mode (SLM) operation at each wavelength without mode hopping. In the CCS, a high-quality triple-ring passive resonator is employed to achieve SLM lasing and a high-birefringence fiber Bragg grating combined with a three-loop polarization controller made with a length of EDF is used to establish a strong PHB effect. Easy switch between dual- and single-wavelength lasing modes is achieved. At a pump power of 150 mW, we obtain dual-wavelength lasing with optical signal-to-noise ratios (OSNRs) of >84 dB for both wavelengths and linewidths of 663 Hz for λ1 and 768 Hz for λ2, respectively; we also obtain single-wavelength lasing at λ1 with an OSNR of >86 dB and a linewidth of 687 Hz or at λ2 with an OSNR of >88 dB and a linewidth of 678 Hz. For both dual- and single-wavelength operations, the two lasing wavelengths are orthogonally polarized, with a degree of polarization of ~100%, and their relative intensity noises are
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2019.2912432