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Illustration of the cladding-pumped cascaded DFB fiber laser (lengths not to scale).
Dual-wavelength cascaded DFB fiber laser: (a) emission spectra at different output levels; (b) signal vs pump power plot.
Dual-wavelength cascaded DFB fiber laser with an external reflector: (a) output spectrum at output power; (b) signal vs pump power plot.
Tuning of the wavelength separation: PSG-2 is heated up and PSG-1 is kept at constant temperature.
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