62 nm CW wavelength-selectable erbium-doped fiber compound-ring laser with stable single-mode output

Abstract

In this demonstration, an erbium-doped fiber (EDF) based laser with stable, wide and wavelength-selectable single-longitudinal-mode (SLM) performances is designed and demonstrated. Here, to achieve SLM oscillation, a compound-ring scheme is constructed in the EDF laser cavity serving as a mode-restriction-filter for densely side-mode suppression. Moreover, the continuous-wave tunability can be scaled from 1520.0 to 1582.0 nm by using the proposed compound-ring scheme and commercial C-band EDF amplifier. In the measurement, the output stability and 3 dB Lorentzian linewidth of each lasing wavelength in the proposed EDF compound-ring laser have also been discussed.

A single-mode erbium laser with switchable single- and dual-wavelength operation

“…Then, to understand the output stabilities of the presented EDF laser, the fluctuations of power and wavelength can be observed through a period of observation time. Figures 3(a Next, a delayed self-homodyne technique could be applied to implement the SLM performance for each lasing single wavelength [17]. The experimental setup is illustrated in figure 4.…”

“…However, owing to the longer fiber cavity and homogeneous broadening influence [12], achieving a stable multi-wavelength operation with single-longitudinal-mode (SLM) output is difficult. Therefore, the Rayleigh backscattering (RB) effect [13], EDF-based saturable absorber (SA) [14], MZI scheme [15], optical injection technique [16] and compoundfiber-ring structure [17] have been investigated to suppress the multi-longitudinal-mode (MLM) oscillation.…”

Stabilized single-longitudinal-mode fiber laser with broadband and flat wavelength output

“…The previous EDF compound-ring laser configurations could achieve single or dual-wavelength SLM output within the C-band operation range [10,11,[31][32][33][34]. The prior result indicated that the output wavelength power was smaller and dropped on both sides slightly.…”

“…The prior result indicated that the output wavelength power was smaller and dropped on both sides slightly. Moreover, exploiting a triple-ring scheme in EDF based laser could reach the SLM operation [31][32][33][34], while the length difference of each fiber ring was larger to cause a wide FSR for multi-mode suppression. Even if the previous studies could extend the tunability, the observed output power could not achieve a flat distribution over the whole tuning range.…”