Chaos synchronization communication using extremely unsymmetrical bidirectional injections

Abstract

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.

Frequency-Frequency Interactions in Chaos Communications

“…Recently, the chaotic synchronization and the chaotic secure communication have received increasing attention [11][12][13][14][15]. The synchronization of chaotic laser systems plays an important role in chaotic communications [16][17][18][19][20]. As in ordinary communication, the specific frequency carrier is modulated with the message and transmitted.…”

Visualizing the Phase-Space Dynamics of an External Cavity Semiconductor Laser

“…The high speed and high dynamical dimensionality of ECLs has attracted broad interest for various applications, ranging from radar [3], ultrafast random bit generation [4,5], and optoelectronic oscillators [6,7], to name a few. Moreover, the intrinsic dynamics of ECLs have attracted attention to implement a number of information-processing functionalities in the physical layer, including chaotic encrypted data communications [8][9][10], compressive sensing [11], and reservoir computing [13,14]. But to realize the full potential of such applications, a detailed knowledge of the complex dynamics of ECLs is required [15], and despite 50 years of study, there are basic issues that remain to be elucidated.…”

Chaotic optical cryptographic communication using a three-semiconductor-laser scheme

“…Optical feedback, optical injection, and optoelectronic feedback have been adopted to serve the purpose, and therefore the SLs are good candidates for secure chaosbased optical communications [8][9][10][11]. For communication between two SLs, a message is added into the chaotic fluctuations of the transmitter laser (TL) by using an encryption technology, and then extracted by a receiver laser (RL) that is similar to the TL, by virtue of chaos synchronization and the chaos pass filtering [12][13][14][15] effect. Several well-known encryption schemes are listed as follows: chaos masking [9,10], chaotic modulation (CMO) [5,16], chaos shift keying [17], and other encryption schemes [12,18].…”

“…For communication between two SLs, a message is added into the chaotic fluctuations of the transmitter laser (TL) by using an encryption technology, and then extracted by a receiver laser (RL) that is similar to the TL, by virtue of chaos synchronization and the chaos pass filtering [12][13][14][15] effect. Several well-known encryption schemes are listed as follows: chaos masking [9,10], chaotic modulation (CMO) [5,16], chaos shift keying [17], and other encryption schemes [12,18]. Up to the present, remarkable research efforts have been invested on normal/coherent optical feedback systems [1][2][3]5,6], which require locking of optical carrier frequency.…”