Information Encoding and Decoding Using Unidirectionally Coupled Chaotic Semiconductor Lasers Subject to Filtered Optical Feedback

Abstract

We present a detailed numerical study of the dynamics of two unidirectionally coupled semiconductor lasers subject to filtered optical feedback. We show that this chaos-based communication scheme allows for an improvement in the decoding of encrypted messages in comparison with the conventional feedback scheme. We found that the performance of the system is optimal when the closed-loop configuration and similar filters are used in the emitter and receiver systems.

Routes to complex dynamics in a ring of unidirectionally coupled systems

“…The considered type of coupling is important from practical point of view, e.g., for secure communication, where unidirectionally coupled lasers are used. [63][64][65] Our investigation gives an overview on possible dynamics in such scheme.…”

Two-channel opto-electronic chaotic communication system

“…Although the proposed scheme is not so fast as an all-optical one [10] due to a relatively low fundamental frequency of the R¨ossler oscillator, it demonstrates a good enough quality of signal transmission. The replacement of the electronic circuits by chaotic semiconductor lasers would allow an increase in the communication speed up to several Gb/s.…”

Synchronizing coupled semiconductor lasers under general coupling topologies

“…Figure 1 shows a globally optical coupled semiconductor array as appeared in [4]. We study the following dynamic equations for n linearly coupled semiconductor lasers [5], [14]- [16]:…”