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We report on the observation of modulation instability induced by cross-phasemodulation in a dual-wavelength operation dispersion-managed soliton fiber ringlaser with net negative cavity dispersion. The passively mode-locked operationis achieved by using nonlinear polarization rotation technique. A new type ofdual-wavelength operation, where one is femtosecond pulse and the other ispicosecond pulse operation, is obtained by properly rotating the polarizationcontrollers. When the dual-wavelength pulses are simultaneously circulating inthe laser ring cavity, a series of stable modulation sidebands appears in thepicosecond pulse spectrum at longer wavelength with lower peak power due tomodulation instability induced by cross-phase modulation between the two lasingwavelengths. Moreover, the intensities and wavelength shifts of the modulationsidebands can be tuned by varying the power of the femtosecond pulse or thelasing central wavelengths of the dual-wavelength pulses. The theoreticalanalysis of the modulation instability induced by cross-phase modulation in ourfiber laser is also presented.

Modulation instability induced by cross-phase modulation in a dual-wavelength dispersion-managed soliton fiber ring laser