Wavelength-tunable mode-locked fiber laser based on an all-fiber Mach-Zehnder interferometer filter

Wavelength-tunable dissipative solitons and amplifier similaritons have been obtained by inserting all-fiber Mach-Zehnder interferometer[MZI]filters with different free spectral ranges[FSRs]in a Yb-doped mode-locked fiber laser.The MZI filter is fabricated by splicing one segment of seven-core fiber[SCF]between two segments of single-mode fibers.The bandwidth of the filter depends on the FSR of the modulated interference curve and consequently depends on the tapered fiber diam-eter.Inserting MZI filters with bandwidths in a fiber laser and applying a tensile strain on the tapered SCF,both wavelength-tunable dissipative solitons and amplifier similaritons have been obtained.