Chaos bandwidth enhancement using semiconductor laser subject to optical injection and optical feedback

• Main Authors: Hsin-HaoHuang, 黃信豪
• Other Authors: Sheng-Kwang Hwang
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/cj95e4

碩士 === 國立成功大學 === 光電科學與工程學系 === 104 === Chaos dynamics has lots of applications, which contain secret communication, radar, random number generator, etc. If the bandwidth of chaos increases, the level of confidentiality in communication system can be improved. The radar can be able to more accurately detect. And the random number generator can also provide more bits in unit time. Chaos dynamics can be generated by optical injection, optical feedback or optoelectronic feedback system. But the bandwidth of above systems is limited by the frequency response. Therefore, the chaos dynamic generated by feedback system has been widely investigated in this thesis. In order to produce high- frequency chaos, we combined optical injection system with optical feedback system. Then, we respectively replaced optical injection system’s master laser or slave laser with chaos dynamics of feedback system. When the chaos dynamics is subjected by a continuous wave injection, the bandwidth will increase with injection strength increasing. However, the large injection strength will affect the chaos dynamics into relatively stable dynamics. The limit of bandwidth enhancement is depended on the different frequency between the peak in optical spectrum of the chaos dynamics and the peak of injection laser. When a semiconductor laser is subjected by a chaos wave injection, the injection strength had no effect on the chaotic dynamic bandwidth. But the different frequency between the peak in optical spectrum of the chaos dynamics and peak of slave laser is highly correlated. In this thesis, both of them can be caused double to triple as wide as the bandwidth of the chaos dynamic of feedback system.