Fig. 1: Synchronized multi-wavelength mode-locking of soliton pulses.
From: Synchronized multi-wavelength soliton fiber laser via intracavity group delay modulation
a Operation principle of synchronized multi-wavelength soliton fiber laser in frequency and time domain. b Sketch of the mode-locked fiber laser. WDM wavelength division multiplexer, EDF erbium-doped fiber, OC optical coupler, PI-ISO polarization insensitive isolator, SA saturable absorber, PC polarization controller, PPS programmable pulse shaper, SLM spatial light modulator, L1–L2 collimating lenses, FROG frequency-resolved optical gating. The group delay difference (d1 to dn) among the multiple spectra (ν1 to νn) can be counteracted by introducing group delay with the SLM. The inset shows the typical FROG spectrogram of synchronized dual-wavelength mode-locked fiber lasers.
