Enhanced emission perturbations associated with mixed optical injection in laser diode

Nonlinear and chaotic dynamics for a continuous emission (CW) laser diode with Fabry-Perot cavity is studied experimentally. Uni-directional and Bi-directional fiber optical injection configuration was constructed in the absent of modulation. The optical injection itself mixed with optoelectronic feedback (OEFB) mode hopping and rout to chaos were observed. This optical injection is reversed to produce a pure optical injection (01), with observing dynamics generated in another identical laser diode (LD2). That's to say, at first, LD1 receives optical injection from LD2 (initially mixed in with self OEFB), then, in the second case, LD2 (operating with its self OEFB) receives pure optical injection came from LD1. a generation of mode-lock and for a specific bias current levels, unstable chaos generated is observed. Third case, experiment contained the mutual optical feedback. Results indicates a variety of nonlinearities associated with such a last three configurations, a mode shift achieved. Ratio of O1 was controlled and also OEFB strength. Mode hoping, multimode emission, mode lock and chaotic behavior all achieved experimentally. Additional tested parameter was the two lasers bias current. The chaotic pulse linewidth was around 300 MHz, with the ability to be boarder via changing detuning or injection ratio. Laser changed to emit in pulsation with rout to chaos status in which it has a FWHM around 0.1GHz. Reversing injection led to linewidth enhancing with a very sharp FWHM, 1.5 KHz. Laser emission perturbed due to mixed injection as if it works with OEFB, where the gain switches tends to drive the laser into pulsing states induced by that positive OEFB. For each achieved result them exist an application, such as; chaos shifts keying, frequency mixing, and up-conversion to a new frequency to reduce cost on high-speed electronics associated with optical communications.