Research On Transmission Modeling And Simulation Of Submarine Open Optical Cable System

In recent years,the arrival of the era of big data has driven the explosive growth of communication data,providing a broad space for development of submarine fiber optic cable communication systems that undertake to transmit more than 97%of the data traffic of global international communications.With the emergence and development of coherent optical detection and high-speed digital signal processing technology,in order to adapt to the explosive growth of international communication data traffic,the optical fiber transmission technology used in submarine optical cable systems is also continuously upgraded,and the the technical cycle of the link terminal equipments are getting shorter and shorter.In order to achieve balance in terms of price,performance,and functions,system operators and construction manufacturers are more and more inclined to use submarine open optical cable systems,system design solutions that decouple the shore station equipment from the subsea link.Compared with the traditional integrated submarine optical cable system,the shore station equipment in the submarine open optical cable system can be accessed by different operators.At this time,the utilization rate of the submarine link is greatly improved,and the same optical fiber pair is used to transmit different light waves with different modulation formats,power and other parameters come from different SLTE.Therefore,it is particularly important to conduct correlation modeling and accurate evaluation of the common fiber transmission performance of submarine open optical cable systems with different modulation formats of channels.This paper aims at the problem of transmission modeling and performance evaluation under the conditions of decoupling and connection between shore stations and subsea links in current open-sea optical cable systems,and studies the nonlinear transmission impairment model and the transmission performance evaluation related to modulation formats of channels,as well as simulation and evaluation techniques for single-end dispersion-compensated transmission performance of subsea incoherent channels in new application scenarios such as subsea observation networks.The main work and innovations of the paper include:Firstyly,the transmission scenarios and modeling requirements of the submarine open optical cable system are analyzed,and the transmission model and system architecture of the submarine open optical cable system are established.Secondly,aiming at the problem of transmission performance evaluation with different modulation formats in submarine open optical cable systems,a nonlinear noise evaluation model associated with modulation formats is established and compared with a non-linear noise Gaussian model with non-modulation formats.The results show that when the influence of the modulation format is considered in the performance evaluation of the submarine open cable system,the predicted capacity of the system will increase significantly.Thirdly,for the single-ended dispersion-compensated non-coherent submarine cable system with small and slow transmission traffic such as undersea observation,a transmission performance evaluation model of the system is established.By comparing the theoretical evaluation results with simulation results,the differences are less than 0.5dB,proving the validity and accuracy of the theoretical evaluation results,which can effectively save the evaluation time of the transmission performance of the design scheme in the system design stage.