Abstract
The influence of intra-cavity propagation delay in message encoding and decoding using chaotic semiconductor lasers is numerically investigated. A message is encoded at the transmitter laser by a chaos shift keying scheme and is decoded at the receiver by comparing its output with the transmitter laser. The requisite intra-cavity propagation delay in achieving synchronization of optical chaos is estimated by cross-correlation analysis between the transmitter and receiver lasers’ output. The effect of intra-cavity propagation delay on the message recovery has been analyzed from the bit error rate performance. It is found that despite the intra-cavity propagation delay magnitude being less, it has an impact on the quality of message recovery. We also examine the dependency of injection rate, frequency detuning, modulation depth and bit rate on intra-cavity propagation delay and associated message recovery quality. We found that the communication performance has been adequately improved after incorporating intra-cavity propagation delay correction in the synchronization system.
Highlights
The development of high-speed, secure optical communication has been an important field of research in recent times and has been gaining momentum due to both the requirement scenario and the relevant technological advances [1,2,3,4,5,6,7,8,9,10,11]
We have systematically investigated the influence of intra-cavity propagation delay in the message recovery process, by considering various coupling rates, detunings, modulation depths, and bit rates of the encoded message
The system under investigation consists of an external cavity semiconductor laser serving as the transmitter laser (TL), and another solitary semiconductor laser playing a role of receiver laser (RL)
Summary
The development of high-speed, secure optical communication has been an important field of research in recent times and has been gaining momentum due to both the requirement scenario and the relevant technological advances [1,2,3,4,5,6,7,8,9,10,11]. In 2005, a field-based experiment of chaos-based optical communication by CSK scheme of encoding using semiconductor lasers with the optical fiber networks has been demonstrated [4]. In a recent study the synchronization quality is shown to be affected by intra-cavity propagation delay (τPD ) in chaotic semiconductor lasers [48,49]. We discuss our numerical investigations on the effect of intra-cavity propagation delay on the message encoding and decoding using uni-directionally coupled semiconductor lasers. Based on the CSK scheme, we encode 1.2 Gbit/s bit rate (BR) message with the chaotic output of the transmitter laser and transmit to receiver laser. The message is decoded at the receiver laser and studied the effect of intra-cavity propagation delay τPD on message recovery. The BER of the recovered message has been reduced after considering intra-cavity propagation delay correction in the receiver laser system
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