Chaos synchronization communication using extremely unsymmetrical bidirectional injections

School of Information Science and Technology, Southwest Jiaotong University, Cheng'du, Sichuan, China.
Optics Letters (Impact Factor: 3.29). 03/2008; 33(3):237-9. DOI: 10.1364/OL.33.000237
Source: PubMed


Chaos synchronization and message transmission between two semiconductor lasers with extremely unsymmetrical bidirectional injections (EUBIs) are discussed. By using EUBIs, synchronization is realized through injection locking. Numerical results show that if the laser subjected to strong injection serves as the receiver, chaos pass filtering (CPF) of the system is similar to that of unidirectional coupled systems. Moreover, if the other laser serves as the receiver, a stronger CPF can be obtained. Finally, we demonstrate that messages can be extracted successfully from either of the two transmission directions of the system.

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Available from: Wei Li Zhang, May 20, 2015
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    • "rectional injection [8], [9] etc., have been conducted to achieve stable synchronization and to enable bidirectional communication in MC-SLs system. Alternatively, some observations show that two independent nonlinear oscillators can also be synchronized if they are driven by a common noise or chaotic signal [11]–[13], [17]. "
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    • "Here it is applied to an ECSL system. For simplicity, the characteristic of multi-modes is not included since a single mode operation is demonstrated experimentally or theoretically in most cases [37] [38] [39] [40] [41] [42] [43] [44] [45]. Without loss of generality, the spontaneous emission noises are excluded. "
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    • "Here, the perturbations are two small amplitude sinusoidal signals. They are added to the outputs of SL1 and SL2 through external modulation [22], which is described as mathematically, wherein stands for the modulated chaotic carrier (including the perturbation part), is the output of the SLs, is the modulation index, and is the modulation frequency. In Fig. 6, we plot the spectra "
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    ABSTRACT: We numerically investigate the chaos synchronization and message transmission between two mutual coupling semiconductor lasers (MCSLs) subject to identical unidirectional injections (UIs) from an external cavity semiconductor laser (ECSL). The synchronization between the MCSLs is realized through injection locking in conjunction with symmetric operation. The simulation results show that stable isochronal synchronization between the MCSLs can be achieved under proper driving injections. This type of synchronization is robust to parameter mismatch up to tens of percentage and frequency detuning of several tens of gigahertz, which is much better than those of the MCSLs systems with self-feedback. Moreover, the investigations on the mutual chaos pass filtering effects and the message transmission indicate that the isochronal synchronization allows mutual message exchange with a bit rate higher than 10 Gb/s, when the chaos modulation technology is adopted. In addition, the MCSLs can synchronize with the ECSL for proper UI and MC, which provides an opportunity for array chaos synchronization and chaos communication networks. Finally, leader/laggard synchronization can also be achieved in the proposed system.
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