Dual-channel chaos synchronization and communication based on unidirectionally coupled VCSELs with polarization-rotated optical feedback and polarization-rotated optical injection

Abstract

A novel dual-channel chaotic synchronization configuration is proposed. This system is constructed on the basis of two unidirectionally coupled vertical-cavity surface-emitting lasers (VCSELs), where a VCSEL subjected to polarization-rotated optical feedback is used as a transmitter and the other VCSEL subjected to polarization-rotated optical injection is used as a receiver. The synchronization and communication performances of such a system are numerically investigated. The results show that, similar to polarization-preserved coupled system with polarization-preserved optical feedback at the T-VCSEL port and polarization-preserved optical injection at the R-VCSEL port, such polarization-rotated coupled system can also realize complete synchronization between each pair of linear polarization (LP) modes and the total output of T-VCSEL and R-VCSEL. Compared with the polarization-preserved coupled system, this proposed system has higher tolerance to mismatched parameters. Furthermore, the average intensities of two orthogonal LP modes are almost the same so that this framework may be used to realize dual-channel chaos communication. Under the additive chaos modulation (ACM) encryption scheme, the encoded messages can be successfully extracted for both of orthogonal LP modes.

Duplex chaotic message tranmission using polarization mode carriers in small networks of three chaotic vertical-cavity surface-emitting lasers

“…Our three chaotic VCSELs are modeled based on the well-known spin-flip model (SFM) [2,4]. To obtain the desired results, additional terms should be added for the three VCSELs: optical feedback terms for D-VCSEL, and optical feedback and injection terms for T-VCSEL and R-VCSEL.…”

“…Message encoding and decoding using two unidirectionally coupled VCSELs has been experimentally demonstrated [1]. A novel dual-channel chaotic communication has also been proposed and numerically studied, where the two encoded messages is successfully recovered for both of orthogonal linear polarization (LP) modes [2]. However, the bit rate of the encoded message is limited to several hundred MHz due to the lower bandwidth of typical commercial VCSELs.…”

Impacts of mismatched intrinsic parameter on leader-laggard synchronization between two mutually coupled VCSELs

“…The rate equations (1)-(4) can be used to solve numerically with the fourth-order Runge-Kutta algorithm. During the calculations, typical parameters are used as follows [2]: k = 300 ns -1 , α = 3, g a = 0.1 ns -1 , g p = 10 ns -1 , g e = 1 ns -1 , g s = 50 ns -1 , ω 1 = 2.2176 Â 10 15 rad/s (the corresponding central wavelength is 850 nm), μ = 2.5, τ = 3 ns, β sp = 10 -6 ns -1 , and η 21 fixed at a moderate strength of 30 GHz.…”

“…Vertical-cavity surface-emitting lasers (VCSELs) have been considered as key devices for optical communications, optical interconnection and optical signal processing because of their prominent advantages over traditional edge-emitting lasers, such as low threshold current, singlelongitudinal mode, large modulation bandwidth, low cost and wafer-scale integration capability for large arrays configuration [1][2][3][4][5][6]. Nowadays, mutually coupled VCSELs have attracted considerable interests due to their important application in bidirectional chaos secure communication fields.…”

Variable-polarization optical feedback induced high-quality polarization-resolved chaos synchronization in VCSEL

“…Chaotic operation in semiconductor lasers can be achieved by means of an external optical feedback (OF) realized using optical mirrors or the coupled cavity design [1,2]. In a number of applications such as communication systems, high pump sources and optical fibre systems, a potential light source that could be adopted is the vertical-cavity surface-emitting lasers (VCSEL) with unique features including high data rates, low power consumption and lower manufacturing costs [3,4].…”