A Single-Mode Erbium Fiber Laser With Flat Power Output and Wide Wavelength Tunability

Yeh, Chien‐Hung; You, Wei-Yao; Chen, Jhao-Ren; Lin, Wen−Piao; Chow, Chi‐Wai; Chen, Jing-Heng

doi:10.1109/jphot.2020.3039988

Cited by 9 publications

(5 citation statements)

References 16 publications

(19 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, according to the well-versed Schawlow-Townes formula [3], ring laser with a longer cavity length has a longer photon lifetime, in which narrower linewidth is easier to obtain [4]. Therefore, numerous approaches have been proposed to achieve single-longitudinal-mode oscillation from fiber ring laser, such as employing a phase-shifted fiber Bragg grating (FBG) to form an ultra-narrow filter [5], utilizing an unpumped Er 3+ -doped fiber as a saturable absorber [6], adopting a compound-ring cavity structure based on Vernier effect [7], and the combination of two or even more of these schemes [8]. Nevertheless, for fiber ring laser, cavity length cannot be increased indefinitely.…”

Section: Introductionmentioning

confidence: 99%

Stable and Tunable PT-Symmetric Single-Longitudinal-Mode Fiber Laser Using a Nonreciprocal Sagnac Loop

Tao

Wang

et al. 2023

IEEE Access

View full text Add to dashboard Cite

A stable and tunable parity-time (PT) symmetric single-longitudinal-mode fiber laser using a nonreciprocal Sagnac loop is proposed, which is experimentally and numerically demonstrated. The nonreciprocal Sagnac loop only including a 3-dB optical coupler (OC) and a polarization controller (PC) is incorporated into a fiber ring cavity, in which nonreciprocal light transmission between the frequencydegenerate clockwise (CW) and counterclockwise (CCW) resonator modes is induced to suppress multiplelongitudinal-mode oscillation of the laser. The two light paths along the CW and CCW directions in the Sagnac loop are respectively defined as the gain and loss loop of the PT-symmetric laser, due to a controllable birefringence induced by the PC. By controlling the polarization states of the two light waves, the PT symmetry is broken when the gain coefficient is larger than the coupling coefficient, single-mode lasing is thus achieved. Experimental results show that the optical signal to noise ratio (OSNR) of the single-mode lasing at 1550 nm is 43.0 dB, proving the great superiority of PT symmetry for lasing mode selection. By tuning an optical tunable band-pass filter incorporated into the fiber cavity, the wavelength of output singlemode lasing varies from 1530 to 1560 nm, and their 3-dB Lorentzian linewidth varies within a range from 529 to 687 Hz. During a 30-min observation period, the variations of wavelength drift and OSNR of the single-mode lasing are less than 6 pm and 2.42 dB, respectively. The advantages of the proposed scheme are obvious, which include simple structure, low cost, simple operation, and good stability.

show abstract

Section: Introductionmentioning

confidence: 99%

Stable and Tunable PT-Symmetric Single-Longitudinal-Mode Fiber Laser Using a Nonreciprocal Sagnac Loop

Tao

Wang

et al. 2023

IEEE Access

View full text Add to dashboard Cite

show abstract

“…In the same year, Wang et al [19] of Beijing University of Posts and Telecommunication proposed a SLM fiber laser based on a convex-shaped fiber ring combined with a fiber grating and an unpumped erbium-doped fiber loop, and a laser linewidth of 840 Hz and a laser output of 9.21 mW were realized. In 2020, Yeh et al [20] presented a tunable single-frequency narrow linewidth fiber laser with erbium doped fiber (EDF) as SA and self-feedback injection and the wavelength tuning range was 60 nm with an average output linewidth of 18 kHz. In 2022, Wan et al [21] of Shanghai University reported a ring-cavity single-frequency fiber laser with Bi/Er/Yb co-doped fiber as the SA, and the tested linewidth was less than 7.5 kHz.…”

Section: Introductionmentioning

confidence: 99%

Narrow linewidth fiber laser with multiple unpumped EDF fiber loops and self-injection feedback

Li,

Yang,

Sui

et al. 2023

Laser Phys. Lett.

View full text Add to dashboard Cite

In this paper, we proposed a narrow linewidth single-longitudinal-mode (SLM) fiber laser, which was realized by employing a triple-cascaded unpumped erbium doped fiber (EDF) Sagnac loops structure with Rayleigh backscattering (RBS) feedback. Narrow linewidth SLM laser output can be achieved by using the unpumped EDF loops. However, it is generally difficult to achieve laser emission with a linewidth below 1 kHz and a power of tens of milliwatts. In this paper, we propose a fiber laser with multiple unpumped Er-doped fiber loops and self-injection feedback. The cascade of multi-unpumped Er-doped fiber rings is employed to reduce the linewidth of the laser, while the self-injection feedback based on RBS is used to improve the stability of the laser and further compress the laser linewidth. By only utilizing three unpumped Er-doped fiber rings cascaded, we obtain an output beam with a linewidth of 723.05 Hz and laser power of 21.52 mW with 0.30 dB fluctuation during a period time of 30 min at the pump power of 170.6 mW. After introducing the feedback mechanism based on RBS into the fiber laser, an output laser with a linewidth of 530.11 Hz and a laser power of 8.57 mW with 0.23 dB fluctuation in 30 min can be obtained at the pump power of 268.68 mW. Compared with the fiber laser with one unpumped Er-doped fiber ring, the linewidth is reduced more than two times.

show abstract

“…However, the EDF ring lasers with stable single-longitudinal-mode (SLM) operation will be hard to accomplish principally because of the long fiber cavity and the dense multi-longitudinal-mode (MLM) oscillation induced by the homogenous broadening effect of EDF [6], [7]. To ensure and reach the SLM action in the EDF ring fiber laser with advantageous output performance, numerous methods have been operated in the fiber ring cavity, such as using the Mach-Zehnder interferometer (MZI) scheme [8], saturable absorber (SA) based filter [9], [10], Rayleigh backscattering (RB) injection [11], compound fiber ring configuration [12], [13], and narrower optical filter [14], [15]. Chien-Hung Yeh, Li-Hung Liu, Han-Shin Ko, and Yi-Ting Lai are with the Department of Photonics, Feng Chia University, Taichung 407802, Taiwan (e-mail: yeh1974@gmail.com; jk1992581@gmail.com; xzbc699@gmail.com; laietn@gmail.com).…”

Section: Introductionmentioning

confidence: 99%

A Selectable Single-Mode Erbium Fiber Laser With Mach-Zehnder Interferometer and Rayleigh Injection Scheme

Yeh

Liu

et al. 2022

IEEE Photonics J.

Self Cite

View full text Add to dashboard Cite

In the paper, a hybrid Mach-Zehnder interferometer (MZI) and Rayleigh backscattering (RB) injection is designed and applied in the erbium-doped fiber (EDF) ring laser configuration. The MZI scheme and RB-induced signal can accomplish the single-longitudinal-mode (SLM) oscillation and narrow the linewidth to kHz target for each generated wavelength over the available wavelength-tuning bandwidth. In the measurement, the output power, optical signal to noise ratio (OSNR) and wavelength linewidth of the designed fiber laser are also executed and discussed.

show abstract

A Single-Mode Erbium Fiber Laser With Flat Power Output and Wide Wavelength Tunability

Cited by 9 publications

References 16 publications

Stable and Tunable PT-Symmetric Single-Longitudinal-Mode Fiber Laser Using a Nonreciprocal Sagnac Loop

Stable and Tunable PT-Symmetric Single-Longitudinal-Mode Fiber Laser Using a Nonreciprocal Sagnac Loop

Narrow linewidth fiber laser with multiple unpumped EDF fiber loops and self-injection feedback

A Selectable Single-Mode Erbium Fiber Laser With Mach-Zehnder Interferometer and Rayleigh Injection Scheme

Contact Info

Product

Resources

About