Multi-Wavelength Broadband Chaos Generation and Synchronization Using Long-Cavity FP Lasers

Simultaneous generation and synchronization of multiple broadband laser chaos with different wavelengths are numerically demonstrated by using long-active-cavity Fabry-Perot (LC-FP) semiconductor lasers based on multi-mode beating effect. Simulation results show that the LC-FP laser under simple optical feedback can produce broadband chaos with a bandwidth up to 37 GHz with an active cavity length of about 1500 um. Furthermore, common-signal-induced chaos synchronization is predicted. Driven by a common chaos from the optical-feedback LC-FP laser, two response LC-FP lasers can reach broadband chaos synchronization with a correlation coefficient beyond 0.98. Meanwhile, the drive-response correlation is low at around 0.4. More interestingly, by optical filtering, parallel multiple broadband chaotic signals at different wavelengths are obtained with bandwidths exceeding 25 GHz and cross-correlation values lower than 0.2. The chaos synchronization keeps for the identical wavelengths. This work will pave a way for increasing capacity of chaos communication.