Design And Implementation Of Communication System Simulation Software Based On New Optical Fiber

With the continuous development of Internet technology,people’s demand for network traffic is also increasing.The transmission capacity of traditional single-mode fiber has reached the upper limit of theory,which is not enough to support large data traffic transmission in data center interconnection and optical access network.The new type of fiber represented by the few mode fiber(FMF)uses the mode division multiplexing(MDM)technology to increase the transmission capacity of a single fiber.In particular,the weak-coupled FMF does not need complex optical receiver and optical transmitter in short-distance transmission,and has become one of the preferred fibers for large-flow short-distance communication systems in the future.Due to the influence of dispersion,attenuation and various nonlinear effects in the transmission of light waves in FMF and the cross talk between modes caused by the unsatisfactory transmission conditions,the simulation of FMF is difficult.New types of optical fiber are also used sparingly.Therefore,it is necessary to develop a special optical communication simulation software for new optical fiber,save the application cost of new optical fiber,and assist optical communication system designers to design optical communication system based on new optical fiber.In this paper,the simulation requirements of the optical communication system based on weakly coupled FMF are studied.The model of light wave transmission in weakly coupled low-mode fiber is designed,the fast calculation algorithm based on matrix library is proposed,and the simulation software of the communication system based on new fiber is designed,developed and tested.The main work and achievements of this paper are as follows:1.The transmission theory of light in weakly coupled FMF is studied.Considering the effects of attenuation,third-order dispersion,self-phase modulation(SPM),cross-phase modulation(XPM)and four-wave mixing(FWM),a transmission model of weakly coupled FMF is designed.2.A fast calculation algorithm of weakly coupled FMF model is proposed.In this algorithm,the step size is divided into smaller intervals on the basis of the step Fourier algorithm,and the intervals are calculated independently by parallel algorithm.Meanwhile,the crosstalk term between modules is expressed as matrix vector multiplication and the matrix library is used to accelerate the calculation.3.A simulation control method of optical fiber communication system based on graph calculation is presented.In this method,the optical fiber communication topology network is converted into a graph,and then the graph is divided into a subgraph by breadth-first search.The subgraph contains several independent simulation devices which can be calculated in parallel.When one subgraph is calculated,the next subgraph can be quickly divided,so as to realize the simulation control of optical fiber communication system.4.The optical fiber communication system simulation software is designed and implemented.The function and architecture of the optical fiber communication system simulation software are designed.The graphical user interface,network interaction module,simulation control module,system configuration module and extensible device library are developed.