Research Of Channelized Receiver Technology Using The Photonic Method

When science and technology are rapidly developing, environment of signals is becoming increasingly complex. Coverage area of frequencies is not only becoming larger and there may be many signals simultaneously at the same time. Channelization is an effective way to achieve broadband RF receiver and has good ability to process arriving signals simultaneously. The process of conventional channelization is generally realized within electrical field, required components are so many and the system structure is more complex and bulky, it can not meet the increasing demand for bandwidth. The photonic method satisfies larger bandwidth, which is simpler, and the loss of it is lower, it also has an ability to anti-electromagnetic interference, so it can be a good solution of solving "electronic bottleneck problem."This paper focuses on research of channelized receiver technology using the photonic method based on cascaded FWM and periodic filter. In order to achieve channelization, the system architecture is proposed based on optical feedback to make FWM efficiently occur. According to the system structure, multiple multicasting of RF signal is completed. The main contents are as follows:1) First, the traditional system structure based on cascaded FWM effects is made simulation analysis, a combination of 10 single-frequency signals is used as a RF signals, the frequencies of detected RF signals through channelized receiver technology using the photonic method are the same as original combination of 10 single-frequency signals but there are some fluctuations about power of them within a flatness of about 4 dB. Then MATLAB software is used to analyze linear phase matching and intensity-dependent phase matching in order to achieve efficiently cascaded FWM. The third proposed system structure utilizing optical feedback system is used to make cascaded FWM efficiently occur and realize multiple multicasting of RF signal, their simulation analysis shows that the feedback system can achieve multicasting. Finally, we calculate important parameters of required periodic filter to provide a suitable periodical filter to match every channel.2) The experiment is performed on the basis of the system simulation analysis. First, the experimental system of efficiently cascaded FWM based on feedback system is set up and we analyze the many factors affecting the efficiently cascaded FWM effects. Such as the power of the pump light, the interval between the pump light as well as the power and frequency modulated RF signal in order to suppress stimulated Brillouin scattering. The experiment of multiple multicasting of RF signal is conducted by means of above experimental system based on the feedback system and we observe experimental results that achieve 24-way multicast of RF signals and 10-channel signals can be observed on the spectrum analyzer by use of PD, finally the SNR of 10-way multicast is analyzed,.