Generation of stable and narrow spacing dual-wavelength ytterbium-doped fiber laser using a photonic crystal fiber

Dual-wavelength Q-switched thulium-fluoride fiber laser for S+/S band using molybdenum disulfide (MoS2) as a saturable absorber

“…The core and cladding of the PCF act as arms of the Mach-Zehnder filter, whereby the splicing points between PCF and single-mode fiber play a role as couplers splitting or combining light powers in the arms of the filter. As the refractive index of the cladding is smaller than the core, the different optical paths corresponding to the arms of the Mach-Zehnder filter could be achieved and lead to the accumulation of phase difference along the PCF to generate dual-wavelength operation [51]. The output from the PCF is now connected to the SA, before finally being connected to the 1500 nm port of the WDM, thus completing the optical circuit.…”