A scheme of generating multi-wavelength optical pulses based single light source optoelectronic oscillator (OEO) is proposed. By utilizing a directly modulated laser and spectral slicing technique, multi-wavelength optical pulses and electrical clock signal are generated in an OEO cavity. Multi-wavelength channels form a multi-loop configuration naturally, which can effectively suppress sidemodes. In demonstration, 10-ps-wide optical pulses at 5 GHz repetition rate are generated with 1 ps timing jitter, which can be arranged in 20 GHz (4×5 GHz) OTDM and time-/wavelength-interleaved optical pulse stream at different nodes. Along with the optical outputs, 5 GHz electrical signal with low phase noise (-113 dBc/Hz at 10 kHz offset from the carrier) and -100 dBc/Hz spurious modes suppression is also obtained.