YAN Sen Lin

Department of Physics and Electronic Engineering, Nanjing Xiaozhuang University, Nanjing 211171, China

(Received October 18, 2010; Accepted November 4, 2010)

A round-coupling configuration of two inverse-injection semiconductor lasers is presented for logic gate applications. Two laser diodes coupled via injection from the opposite laser became chaotic. Chaotic synchronization is achieved between the two lasers. Two all-optical or two optoelectronic logic gates can be implemented by modulating the injected light or laser diode current, respectively, to synchronize or unsynchronize the two chaotic states. Numerical results show the validity and feasibility of the method.

Key words: chaos, synchronization, semiconductor laser, inverse injection, logic gate