Study On Signal Amplification Technology Applicable To All-optical2-D Negative Feedback System

Optical two-dimensional signal amplification technology indicates the methodthat amplify the weak beam through controlling the transfer of beam energy, in whichcase the two-dimensional information attached to the weak beam could be enhanced.Similar to the case in electric feedback system, quality of signal amplification modulein optical feedback system determines the system performance in accuracy, stabilityand anti-interference capability to some extent. The design of proper optical signalamplification scheme is the key to the implementation of high-speed parallel, stable,low-noise and high-quality output in all-optical two-dimensional negative feedbacksystem. The optical two-dimensional signal amplification technologies that applied toclosed loop feedback system usually need to meet the system requirements for gain,time stability, amplification uniformity and phase noise. In this paper, the signalamplification scheme in all-optical two-dimensional negative feedback system hasbeen studied deeply. Detailed descriptions focus on the choice of amplification method,the design of optical amplification system and the analysis of light amplificationperformance have been applied. Combined with simulations, important conclusionsabout gain magnitude and uniformity of light amplification based on two-beamcoupling have been reached.The main contents of the paper:①The common optical two-dimensional signal amplification technologies havebeen analyzed and made comparison. Based on the structural principle and thecharacteristic of signal processing in all-optical two-dimensional negative feedbacksystem, the system requirements for light amplification module have been analyzed,and the optimal light amplification method that apply to system has been chosen.②The physical mechanism of light amplification based on two-beam couplinghas been studied. The appropriate working mechanism and dielectric material oftwo-beam coupling that applied to system has been chosen. The light amplificationmodule has been built properly, and the all-optical two-dimensional negative feedbacksystem has been further completed.③Under the consideration of the difference in spatial frequency among eachpixels of incident beams, a new two-beam coupling mathematical model has been built.Moreover, a new research method about gain distribution of the two-dimensional mathematical model has been proposed, and the gain distribution on each pixel ofsignal beam has been given.④Through simulation, the effects of crystal thickness, incident angle and opticalwavelength on gain magnitude and uniformity of light amplification based ontwo-beam coupling have been studied.The innovative points of the paper:①Through the analysis of all-optical two-dimensional negative feedback systemrequirements for its signal amplification module, the appropriate light amplificationmethod has been chosen. A novel idea that apply the light amplification technologybased on two-beam coupling to optical feedback system has been presented. Theoptical signal amplification scheme that apply to all-optical two-dimensional negativefeedback system has also been designed.②Considering the difference in spatial frequency of each pixel in incident beamsduring two-beam coupling, a new two-dimensional mathematical model has been built.A new research method about gain distribution of two-dimensional signal beam intwo-beam coupling effect has also been proposed.