The Research And Application Of Arbitrary Signal Generation Based On Photon Echo

With the deep study of the photon echo theory, the application of photon echo technology is gradually mature, especially in arbitrary signal generation. Conventional arbitrary signal generation methods can not generate the signal with tens of GHz bandwidth, tens of GHz repletion frequency and high time-bandwidth product. However, photon echo technology can meet the above requirements by using the spectral hole burning crystal material which has dozens of GHz inhomogeneous broadening line width, and a few hundred KHz homogeneous broadening line width. As a consequence, photon echo technology become one of the hot issues of the research.This paper briefly introduced the characteristic of the spectral hole burning crystal and the study progress of the photon echo. The forming process of the photon echo is analyzed based on semi-classical theory. The forming process of the compressed pulse is analyzed based on photon echo theory. Based on photon echo theory, a high bit rate pulse position modulation signal generation method and a high time-bandwidth product and high repetition rate signal generation method are proposed. Finally, a range method and radar system is presented based on the spectral hole burning crystal material. The main work includes as follows:1. According to Bloch equations, the Bloch vector solution of the nutation effect and free induction decay is presented. Then the photon echo process is decomposed into seven stages which alternated between nutation effect and free induction decay. Moreover, the Bloch vector solution of every stages is presented. According to the variation of the Bloch vector, the forming of the photon echo is explained.2. Based on photon echo theory, the theoretical analysis of the compressed pulse interval control is presented, and a high bit rate pulse position modulation signal generation method is proposed. In this method, the bit rate of the pulse position modulation signal can achieve 10Gbit/s. Compared conventional method, the bit rate improve an order of magnitude.3. Based on photon echo theory, the performance analysis of the signal generated by control code pulse, control probe pulse and simultaneous control code pulse and probe pulse is presented, respectively. Then a high time-bandwidth product and high repetition rate signal generation method is proposed. This method can produce a 40 GHz period signal with a time-bandwidth product reaching up to 510.4. As a range signal, the signal generated by the photon echo theory is applied to the range system. Then a new radar range system based on SHB material is presented. The coherent spectral interference of the transmit range signal and received range signal can be timely recorded by Tm3+:YAG material. The delay between transmit signal and received range signal can be obtained through the FFT transformation of the spectral which is recorded by Tm3+:YAG material. Through the delay of the two signals, the distance of the expected object can thus be acquired. The ranging accuracy of the range laser radar system is about 310-m, while the maximum ranging of this system can reach 4maxR ?2′10 m...