The Research Into High Linear And High Carrier-to-noise Ratio Microwave Photonic Technology

Microwave photonics is a new discipline studying the law and application of the interaction between microwave and light wave. It is generally regarded as an effective way to meet the major challenges in microwave systems. Microwave photonics link is an important branch in microwave photonics,it has many advantages such as strong anti-jamming capability, low noise, low loss and high bandwidth. It has been widely used in the field of military communication and civil communication. The main work of this paper is to study how to improve the linearization and carrier-to-noise ratio of the microwave photonic link. The concrete content is as follows:Analysis the theory model of microwave photonic link, Focuses on two major factors affecting microwave photonic link transmission performance.The first is nonlinear distortion, the second is the carrier to noise ratio of microwave photonic link. This paper also analyzed the methods of phase modulation and intensity modulation, and emphatically explores the technology of how to make the phase modulation into intensity modulation.Analyze the basic principle of spectral vector processing and the structure of the link. This paper mainly analyzes nonlinear compensation technology,real time delay technology, broadband optical beam forming technology,microwave photonic filter technology. By understanding the research achievements of scientific research personnel in the field, laying a foundation of putting forward a new method of improve the linearization and carrier-to-noise of the microwave photonic link.This paper put forward a new method of how to improve the linearization and carrier-to-noise ratio, we call it the research into high carrier-to-noise ratio linear microwave photonic link based on optical spectrum vector manipulation. This method uses spectral processing technology, in the phase domain, the first-order belt of the modulated optical turning 180 degrees, in order to make the phase modulation turn to the intensity modulation. In the amplitude domain, in order to realize the linearization of the link, the amplitude of center optical carrier decay to a specific value. The method changed the status of the previous microwave photonic link, which can't realize both high linearization and the high carrier to noise ratio. This precept increased about 19.08 dB than the traditional optical sideband linearization technique precept.Detailed simulation and prototype experimental verification are presented in this paper. The simulation and experimental results verify well the linearization and high carrier-to-noise ratio performance as in theoretical analysis. The research objectives had been achieved.