Research On Generation And Transmission Characters Of Chaotic-UWB Signal Utilizing Optical Injection Chaotic Laser Diode

Ultra-wideband (UWB) technology is an issue of concern within the whole international and domestic academic circle for its varies of advantages. In order to promote the wide application of UWB technology, making the local UWB systems to the interconnection with the wired network and other networks, Researchers who have proposed and demonstrated the integration of UWB technology and fiber transmission technology in one of the new technology-optical ultra-wideband wireless (UWB-over-fiber) technology. And the core is processing the signals in optical domain. It is not only the reasonable elusion for the electronic bottleneck by virtue of processing the signals in optical domain, and will avoid the extra electro-optical conversion.This dissertation studied several issues in technologies about photonic UWB signals generation and spectrum characteristics control and its transmission characteristics in the fiber based on optical injection chaotic laser diode are summarized as follows:Firstly, we analyze and compare the existing optical UWB generation technologies. The methods based on Gaussian pulse shaping theory are difficult to control the spectrum profile of generated pulse, which confines their applications in the complicated environment and has become increasingly difficult to meet the future needs of different environment.Secondly, integrating the microwave photonic technology and chaotic laser technology, we propose and demonstrate an approach to the generation of UWB pulse utilizing chaotic dynamics of semiconductor laser (SL). The output UWB chaotic optical pulses generated by SL with optical injection can be controlled when the external and internal parameters were tuned. We further experimentally obtain tunable Chaotic UWB microwave signals by tuning optical injection strength when the other parameters are fixed and obtain the UWB pulses with ideal spectrum profile which could satisfy the Federal Communications Commission (FCC) regulations. The experimental results are well consistent with the simulated results.Thirdly, we use the UWB-over-fiber technology and combine with the theory of optical communication to discuss the impact of the fiber dispersion and loss when the Chaotic UWB signal transmitting in the fiber. And we build a new Chaotic UWB-over-fiber link to achieve a modulation of the chaotic UWB signal under different transmission rates, and without utilizing any dispersion compensation in case of successful implementation of signal demodulation at the antenna receiving end.Finally, in this thesis we summarize our discoveries and provide discussion on the possible future research issues.