Selectable and stable single-frequency fiber laser with flattened power range and sub-kHz linewidth output

Hsieh, Shang-En; Chen, Lan-Yin; Hsu, Ching-Hsuan; Lai, Yu-Ting; Yeh, Chien-Hung; Jiang, Syu-Yang; Liaw, Shien-Kuei; Chow, Chi-Wai

doi:10.1088/1402-4896/acf693

Cited by 2 publications

(1 citation statement)

References 20 publications

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“…Consequently, by directly using conventional optical filters as wavelength selection elements for laser oscillators, it is challenging to achieve single-mode outputs. To overcome this challenge, common techniques for single-mode selection in fiber ring lasers include compound rings with Vernier effects [1][2][3][4][5], saturable absorbers [6][7][8][9], cascaded microfiber knots [10], whispering gallery mode resonator [11], phase-shifted fiber Bragg gratings [12], and dynamic gratings [13,14] to establish narrow linewidth filters. However, these methods often require complex cavity structures and fine parameter tuning.…”

Section: Introductionmentioning

confidence: 99%

High-Performance Fiber Ring Laser Based on Polarization Space Parity-Time Symmetry Breaking

Zhang,

Wu,

Tong

et al. 2024

Photonics

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This work proposes and experimentally demonstrates a high-performance polarization space parity-time (PT) symmetric fiber ring laser to achieve a low-noise, narrow-linewidth, and highly stable single-longitudinal-mode output. The gain/loss and coupling coefficients are regulated by adjusting a polarization controller (PC) and the pumping current of an erbium-doped fiber amplifier (EDFA) within the ring cavity. The results show that the single longitudinal mode oscillation of the laser can be implemented by PT symmetry breaking. The frequency noise spectral density and the linewidth characteristics of the laser are evaluated by the short-delay self-heterodyne method. The results reveal that excellent low-frequency noise (181 Hz2/Hz at a 10 kHz offset frequency) and narrow fundamental linewidth (68 Hz) can be achieved. Additionally, the laser exhibits outstanding stability with only 0.64 pm wavelength drift over 30 min. By tuning an optical tunable filter (OTF), the wavelength tunable range of the laser can cover the entire C-band. Furthermore, the impacts of different fiber length on the frequency noise spectral density and the filter bandwidth on stability are analyzed, offering guidance for component selection in such laser systems.

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Section: Introductionmentioning

confidence: 99%

High-Performance Fiber Ring Laser Based on Polarization Space Parity-Time Symmetry Breaking

Zhang,

Wu,

Tong

et al. 2024

Photonics

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Stable and Tunable Erbium Ring Laser by Rayleigh Backscattering Feedback and Saturable Absorber for Single-Mode Operation

Liao,

Kao,

Chen

et al. 2024

QuBS

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This work demonstrates a high-quality erbium-doped fiber (EDF) ring laser in the L-band gain range by combining the Rayleigh backscattering (RB) feedback signal and unpumped EDF induced saturable absorber (SA) filter. The optical filter effect induced by the RB feedback injection and EDF SA could generate single-longitudinal-mode (SLM) behavior and shrink the linewidth to sub-kHz. The output linewidth, power, and optical-signal-to-noise ratio (OSNR) of the fiber ring laser were also shown within the 42 nm wavelength bandwidth of 1565.0 to 1607.0 nm. Also, the instabilities of output power and central wavelength of each lasing lightwave were analyzed with a measurement time of 45 min.

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Selectable and stable single-frequency fiber laser with flattened power range and sub-kHz linewidth output

Cited by 2 publications

References 20 publications

High-Performance Fiber Ring Laser Based on Polarization Space Parity-Time Symmetry Breaking

High-Performance Fiber Ring Laser Based on Polarization Space Parity-Time Symmetry Breaking

Stable and Tunable Erbium Ring Laser by Rayleigh Backscattering Feedback and Saturable Absorber for Single-Mode Operation

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