Diagram of a multi-wavelength optoelectronic oscillator for generating multiple optical pulse streams with low phase noise. EDFA: erbium-doped fiber amplifier, PD: photodiode, EAM: electro-absorption modulator, EBF: electrical bandpass filter, OBF: optical bandpass filter, MUX: optical wavelength multiplexer, DEMUX: optical wavelength demultiplexer.