| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 758384 | Communications in Nonlinear Science and Numerical Simulation | 2012 | 9 Pages |
A physical model of the fundamental configuration of two mutually coupled semiconductor lasers is presented for logic-gate applications, and the principles of optoelectronic logic computing based on chaotic synchronization or chaotic de-synchronization are defined. Two laser diodes were coupled via injection of each into the opposite laser and became chaotic; our analysis showed that the oscillation derives from chaotic fluctuations after a progression from stability to period-doubling by varying the coupling factor, delay time or detuning. Chaotic synchronization is achieved between the two lasers through the coupling, where we found chaotic and quasi-periodic synchronization regions. Based on the chaotic synchronization system, three optoelectronic logic gates can be implemented by modulating the laser diode current to synchronize or de-synchronize the two chaotic states. Finally, we studied the effects of resynchronization time on logic gate function in a practical implementation of the system. Numerical results show the validity and feasibility of the method.
► A coupling semiconductor laser configuration is presented for logic gates. ► The oscillation deriving from chaotic fluctuations after a progression from stability to period-doubling is analyzed. ► Chaotic and quasi-periodic synchronization regions are found. ► Three optoelectronic gates are defined and simulative realized.
