Using multi-ring structure for suppression of mode competition in stable single-longitudinal-mode erbium fiber laser

Abstract

In this demonstration, a stable and tunable single-longitudinal-mode (SLM) erbium-doped fiber (EDF) laser with multiple-ring configuration is proposed and investigated. The proposed compound-ring structure can create different free spectrum ranges (FSRs) to result in the mode-filter effect based on the Vernier effect for suppressing the other modes. Additionally, the output stabilization of power and wavelength in the proposed EDF multiple-ring laser are also discussed.

Silicon-Micro-Ring Resonator-Based Erbium Fiber Laser With Single-Longitudinal-Mode Oscillation

“…Next, to confirm whether the output wavelength is SLM oscillation, the delayed self-homodyne detection is utilized for measurement [6]. The experimental setup is constructed by the Mach-Zehnder interferometer (MZI) configuration, which is made of two 1 × 2 and 50:50 CPRs, a 65 km single-mode fiber (SMF), a PC and a 10 GHz PIN photodiode (PD).…”

“…Stable and tunable erbium-doped fiber (EDF) lasers have many effective applications in the fields of science and engineering, such as in wavelength-division-multiplexing (WDM) communication, optics-fiber sensor, millimeter-wave (MMW) transmission system, material processing, and optical spectroscopy and instrument [1]- [5]. However, owing to the he homogeneous broadening effect of EDF and a longer fiber length of ring cavity in the EDF-based laser, it would introduce the modehopping and densely unstable multi-longitudinal-mode (MLM) oscillations [6]- [8]. Therefore, to overcome these issues, several related methods have been investigated to accomplish the stable single-longitudinal-mode (SLM) output of EDF-based lasers, such as using the optical injection technique [9], unpumped EDF-based saturable absorber (SA) [10], multiple-fiber-ring (MFR) based filter [11], [12], the narrow linewidth optical filter [13], and the Mach-Zehnder interferometer [14].…”