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We demonstrate a 10-GHz multiwavelength pulsed generator based on a fiber optical parametric oscillator. By introducing two separated intracavity branches, simultaneous mode-locking at two different wavelengths in the L-band is achieved. Due to the parametric process between the pump and the two mode-locked signals, two idlers are generated in the S-band. Hence, simultaneous generation of a 10-GHz pulse train at four different wavelengths located in both the S- and L-band is accomplished. The wavelength of the generated pulse trains can be tuned over 54 nm, with the wavelength span from 1500 to 1617 nm. The stability of the proposed scheme is also experimentally investigated.