Multi-channel chaotic signal generation using a weak resonant cavity Fabry–Perot laser diode subject to self-phase-modulated feedback

Abstract We propose and experimentally demonstrate a wideband multi-channel chaotic source using a weak resonant cavity Fabry–Perot laser diode with self-phase modulated optical feedback. In this configuration, self-phase modulation is incorporated into the external optical feedback loop to enhance bandwidth of the generated multi-channel chaos and suppress time delay signature (TDS). The experimental results indicate that, with appropriate optical feedback intensity, 86 lasing modes within the wavelength range of 1530–1570 nm and with the mode spacing of 0.47 nm can be simultaneously driven into a state of chaos, and the generated multi-channel chaos have an enhanced bandwidth and suppressed TDS.