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Wide-bandwidth pulses were generated with a dispersion-managed erbium-doped passively mode-locked fiber laser based on a graphene saturable absorber.The graphene saturable absorber was composed of a tapered fiber deposited with graphene fabricated by liquid-phase exfoliation.The output pulse had a 3-dB bandwidth of 13.6 nm,which is the widest spectrum ever achieved with graphene-tapered-fiber saturable absorbers.