A multi-wavelength fiber ring laser operating in L-band with a semiconductor optical amplifier(SOA)is reported by using a Mach-Zehnder(M-Z)fiber interferometer with channel spacing of 100 GHz as comb filter and an electro-absorption modulator(EAM)as actively mode-locking device.11 simultaneously mode-locked wavelengths are achieved with the repetition rate of 10 GHz and center wavelength of 1 593.6 nm.It is observed that the full-width at half-maximum of the pulses is about 24 ps and the output power variat...