Study On Evaluation And Improvement Technology Of Transmission Performance Of Motion Optical Cable

Today is the era of rapid development of the Internet,and various Internet technologies are emerging.The Internet of Things(IoT)technology establishes the connection between objects and the Internet,Artificial Intelligence(AI)technology promotes the intelligence of life,and big data technology explores the deeper value of data.These technologies also signify that the future is the era of "Intenet+".In this case,the transmission of information in the new era is more important and needs to be built on a stable and reliable communication system,and optical fiber communication system can undoubtedly be well suited to these scenarios.Thanks to the characteristics of optical communication such as wide bandwidth,low loss and anti-electromagnetic interference,the future direction of communication network development must be high capacity and high speed.At the same time,multiple application scenarios are also factors that need to be considered for optical fiber communication systems.Generally speaking,the impact of external forces on overhead optical cables in ordinary environments is negligible,but in specific application scenarios,such as feeders for various types of antennas and other scenarios with high requirements for signal transmission quality,it is necessary to consider the impact of movements such as stretching and bending of optical cables,which commonly include deformation and fiber jitter caused by cable movements.These effects deteriorate the signal transmission quality,such as signal-to-noise ratio,phase shift,and time delay jitter,and cannot be ignored,so it is essential to evaluate and improve the transmission performance of moving optical cables.Our evaluation of its transmission performance can visually reflect the impact caused by the bending and stretching of the moving optical cables,and based on this,we can make corresponding improvements to optimize the received signal at the far end and improve the signal availability.Therefore,it is of great importance to study the transmission performance evaluation and improvement techniques of moving optical cables.This dissertation focuses on the evaluation and improvement of the transmission performance of moving optical cable,and examines relevant domestic and international research solutions,focusing on the signal-to-noise ratio and phase jitter performance of the transmitted signal.The evaluation scheme is designed on the simulated moving optical cable facilities,and the signal-to-noise ratio,signal time domain diagram,phase drift and phase stability of the received signal are evaluated,and finally propose a corresponding solution on this basis.In terms of signal-to-noise ratio,I will combine the motion characteristics of fiber optic cable to propose Delta-sigma modulation of the originating signal at the transmitting end,reduce the quantization noise of the signal by pre-modulating the signal at the transmitting end,and design a corresponding demodulation scheme at the receiving end to achieve the purpose of improving the signal-to-noise quality;in terms of phase jitter,I will design a tunable laser-based phase stabilization transmission scheme to compensate the transmitted signal,scientifically and effectively improve the signal quality and achieve efficient and stable transmission of the signal.The main work and results of the thesis are as follows:1.The dissertation builds a transmission signal quality evaluation platform based on the simulated working condition optical cable experimental device,evaluates the signal-to-noise ratio and phase performance of the transmitted microwave signal under different motion states,and proposes subsequent corresponding solutions based on the evaluation results.2.The dissertation researches the Delta-Sigma modulation and demodulation scheme,combines the simulation design with reasonable modulation order,quantization bit number and oversampling ratio,designs the corresponding demodulation scheme at the receiving end to achieve the best signal-to-noise ratio,and verifies the effectiveness of the program by improving the quality of the signal from the point of view of the originator and the signal-to-noise ratio performance of the signal.3.The dissertation researches the signal phase compensation scheme,and proposes a dynamic,accurate,and highly stable phase compensation scheme based on the tunable laser,which is designed through simulation software and verified through experiments to effectively eliminate the influence of environmental factors on optical fiber link.This scheme solves the disadvantages of traditional solutions that do not fit the motion characteristics of the optical fiber,complex structure and high cost,and further improves the quality of the phase jitter of the signal on the basis of optimizing the signal-to-noise ratio of the transmission signal.4.The dissertation builds a data visualization platform based on Labview to realize the collection and display of the signal's spectrum,waveform and other characteristics,and further obtain the signal's delay jitter and other characteristics.The platform displays the transmission performance of the sports optical cable more intuitively,and constructs a more convenient evaluation and verification system.