Abstract
We demonstrate a thulium-doped, mode-locked, all-fiber laser capable of operating in two generation regimes: dispersion-managed soliton and noise-like pulse (NLP). Employing a nonlinear optical loop mirror as an artificial saturable absorber, the oscillator generated optical pulses with a fundamental pulse repetition frequency of ~15.795 MHz. The total net dispersion of the laser cavity had a slightly anomalous group delay dispersion value of −0.016 ps2. After appropriate adjustment of a polarization controller, bound states of a dispersion-managed soliton composed of three pulses with fixed soliton separations were also observed. NLP generation, tunable over 35 nm from 1943.5 to 1978 nm, was also presented in the same laser setup. To our knowledge, this is the first report of the generation of tunable NLPs in a mode-locked thulium-doped fiber laser based on a nonlinear loop mirror saturable absorber.
Highlights
An intense development of low-loss fiber components for operation in the 2 μm wavelength region has yielded the rapid progress of mode-locked all-fiber lasers emitting in this spectral region
We report the demonstration of two types of dispersion-managed solitons, i.e., stretched-pulse and bound states solitons, generated in a thulium-doped all-fiber laser using a nonlinear optical loop mirror (NOLM) as a saturable absorber
A tunable noise-like pulse (NLP) generation in the Tm-doped fiber lasers (TDFLs) mode-locked by a semiconductor saturable absorber mirror (SESAM) with a tuning range of 47 nm has already been presented [17]
Summary
An intense development of low-loss fiber components for operation in the 2 μm wavelength region has yielded the rapid progress of mode-locked all-fiber lasers emitting in this spectral region. Bound states have been described in the 2 μm wavelength region in TDFLs with slightly anomalous net dispersion and mode-locked by NPR [14] These specific types of ultrashort pulses with fixed separations might be applied in optical communication to enlarge the data-carrying capacity of fiber link [15,16]. Reports on bounded solitons in the 2 μm wavelength region are still sparse Another mode-locking regime, which enables the generation of an optical pulse trace with a relatively high average output power and high pulse packet energy, is noise-like pulse (NLP) generation.
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