Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 37, Issue 13, Pages 3173-3182Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2019.2912432
Keywords
Linewidth; optical fiber laser; optical signal to noise ratio; polarization; relative intensity noise
Funding
- National Natural Science Foundation of China [61705057, 61775128]
- Research Start-Up Foundation of High-Level Talents Introduction [521000981006]
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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 (lambda 1 and lambda 2) 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 bothwavelengths and linewidths of 663 Hz for lambda 1 and 768 Hz for lambda 2, respectively; we also obtain single-wavelength lasing at lambda 1 with an OSNR of >86 dB and a linewidth of 687 Hz or at lambda 2 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 similar to 100%, and their relative intensity noises are <-155 dB/Hz at frequencies over 3 MHz. In addition, the dependence of wavelength, OSNR, and linewidth on pump power and wavelength-tunability on temperature for the proposed fiber laser are also investigated in detail.
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