Stable single-longitudinal-mode erbium-doped fiber laser with narrow linewidth utilizing parallel fiber ring resonator incorporating saturable absorber and fiber Bragg grating

Abstract

A stable, single-frequency, narrow linewidth ring erbium-doped fiber laser (EDFL) is proposed and demonstrated experimentally. The main ultranarrow filter of the ring cavity EDFL is realized by an improved Mach-Zehnder interferometer, which consists of two parallel optical fiber ring resonators (FRRs). The FRRs share a saturable absorber and a fiber Bragg grating. Attributed to the Vernier effect, the single longitudinal mode operation is successfully obtained. The output of the EDFL can present good performance with a narrow linewidth of 1.09 kHz at 1549.57 nm and a high optical signal-to-noise ratio of 68 dB. Meanwhile, the laser has a relatively low threshold of 10.7 mW. In addition, the central wavelength variation and power fluctuation of the laser are less than 0.002 nm and 0.2 dB, respectively, showing favorable stability.

1310 nm Narrow Linewidth Laser Assisted by the Feedback of Double-FBGs

“…1, happens to be the front mirror r2 of the LD. After this, the light signal I2 is divided into two signals, namely I3, which is the reflected, and I4, which becomes the transmitted light signal due to the reflection of FBG [36,37] arising from the impact of L  happens to be similar to that reported in [38]. However, the structures are different since our laser system consists of two FBGs and shorter fiber lengths.…”

Ion-Doped Photonic Crystal Fiber Lasers

“…Although ytterbium-doped ion photonic crystal fibers are still the mainstream of laser development, erbium-doped ion photonic crystal fiber lasers have also been extensively studied in recent years, especially in narrow linewidth output with ultrashort pulse lasers (Li et al, 2015). Li et al (2015) obtained a three-wavelength narrow linewidth output of less than 2 kW or a six-wavelength narrow linewidth output of less than 5 kW using a tunable variable optical attenuator based on Rayleigh scattering for tunable narrow linewidth Brillouin-doped photonic crystal fiber lasers (Pourshab et al, 2017). Pourshab et al (2017) obtained the laser output at 1,561.47 nm with an uplink linewidth of less than 1.19 kHz using an erbium-gallium codoped photonic crystal fiber as the gain medium and a narrowband filter, a sub-ring cavity and a cascaded anisotropic fiber as mode selection.…”

Stable wavelength-swept single-frequency erbium fiber laser in L-band tuning bandwidth

“…Erbium-doped fiber (EDF) lasers with stable single-longitudinal-mode (SLM) have interested more attention owing to their serviceable applications, such as the micro-wave-photonic, optical communication, optical wireless transmission, optics sensor, bio-photonic, and spectroscope [1][2][3][4][5]. To construct the EDF laser, the ringbased fiber cavity would be the simple and easy way [6].…”