Stabilized and wavelength-tunable S-Band erbium-doped fiber ring laser with single-longitudinal-mode operation

Abstract

A stable and wavelength-tunable S-band erbium-doped fiber (EDF) ring laser with single-longitudinal-mode oscillation over the operating range of 1480.6 to 1522.9 nm is proposed and experimentally demonstrated. The proposed ring laser provides a fine mode restriction and guarantees the single-frequency operation based on a shorter length EDF serving as auto-tracking filter. Therefore, the performances of output power of > 10 dBm, power stability of < 0.05 dB, central wavelength variation of <0.01 nm, and side-mode suppression ratio (SMSR) of > 49.1 dB have been experimentally demonstrated in the operating range of 1488.7 to 1505.7 nm.

Using optimal cavity loss and saturable-absorber passive filter for stable and tunable dual-wavelength erbium fiber laser in single-longitudinal-mode operation

“…Here, two ring cavities are set to be the same length of nearly 22 m. To achieve the SLM output for the dual-wavelength, the saturable-absorber filter, which constructed by an OC, a 1 m long EDF and a RFM with 99% reflectivity in C-band window, is employed for signal filtering. This is because that the spatial hole burning (SHB) effect [23][24][25] can be observed in this reflection-typed saturable absorber unit, and thus a narrow-band Bragg grating filter is created. The output spectrum is monitored and stored by an optical spectrum analyzer (OSA) with a 0.01 nm resolution.…”

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

“…In recent years, continuous-wave (CW) erbium-doped fiber (EDF) laser sources with broad tunability, constant single-longitudinal-mode (SLM) action and flat output spectrum have appealed to great interests, because of the promising applications of optical fiber communication, optical fiber sensor, microwave-photonic, and biophotonics [1][2][3][4]. To reach the wavelength selection in the EDF lasers, using the linear-and ring-based fiber cavities have been studied [5]. The ring-based EDF laser could prevent the spatial hole burning, which is induced by the standing-wave influence in linear cavity EDF laser [6].…”

Wavelength-selectable and steady single-mode erbium-doped fiber multiple ring laser

“…Furthermore, the homogenous broadening and mode-hopping of EDF, as well as the longer cavity length, results in vibrational multilongitudinal-mode (MLM) density [9,10]. Up to now, many technologies have been proposed and demonstrated to achieve stable and wavelength-tunable SLM EDF lasers, including the use of saturable absorbers [1,11], compound-fiber-ring structures [12], Mach-Zehnder mode filters [13], and unpumped ytterbium-doped fiber to serve as spatial multi-mode interference [14].…”