A Semiconductor Optical Amplifier（SOA）-based multi-wavelength fiber ring laser using frequency shifted feedback technology is reported in this paper

in which an Acousto-Optic Modulator（AOM） is incorporated as a frequency shifter and a Mach-Zehnder（M-Z） fiber interferometer is used as a comb filter.54 50 GHz-spaced stable continuous multi-wavelength optical lasing in a range of 1.5 dB output optical spectrum and 21.7 nm bandwidth are obtained with an extinction ratio of 28 dB.This laser is characteristic of stable operation

wide output optical spectrum and low output power variations.Experimental results indicate that effective gain equalization between different lasing oscillations is achieved and the output optical spectrum bandwidth increased by 21.7% by using this technology.