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We proposed a dual-wavelength single-longitudinal-mode (SLM) erbium-doped fiber (EDF) ring laser, incorporating a phase-shifted chirped fiber Bragg grating (PS-CFBG) in the laser cavity. The PS-CFBG consists of a permanent phase shift and a thermo-induced temporary phase shift to form two passbands in the spectrum. The wavelength spacing of the two passbands can be continuously tuned by scanning the...
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