The Study On Architecture Of WDM-PON Based On Rings Featuring High Reliability And Scalability

By the impetus of new turn of global-broadband speed increasing,it becomes an indispensable part to social life that video conference,virtual reality technology and other rapidly developed high-bandwidth services developed rapidly.However,due to the bottleneck of the transmission rate,bandwidth and distance,the traditional TDM-PON has been unable to meet the explosive growth of users’ requirements for bandwidth.Compared with TDM-PON,WDM-PON can not only overcome the bottleneck in the field of optical access network development at the present stage,but also improve network reliability and support diverse businesses.The performance of the WDM-PON was mainly affected by transmission technology,modulation mode,optical devices,network architecture and etc.However,few existed research focuses on the design of network architecture,especially in its reliability and scalability.At present,the access network is moving towards to large capacity and multi-service,which has put forward higher requirements for the scale and reliability of WDM-PON network architecture.To ensure that the next generation of optical access network can meet the users’ growing needs much better,the novel WDM-PON network architecture should have the ability to provide services to users,and high reliability,scalability and other features as well.This paper focuses on the research of high reliability WDM-PON ring system with scalability.The main work and achievements of thesis are as follows:1.In terms of the problem that the scale and capacity of the optical access network can not satisfy the exponential growth in user number and bandwidth requirements in the future,a scalable and upgradable WDM-PON network architecture based on dual-fiber multiple tangent rings is proposed.The system can switch the working mode according to the system operating status,and achieve colorlessness in the ONU through the Mach-Zehnder re-modulation technology.The innovations of the scheme are as follows: 1)The design of dual-fiber rings allows upstream and downstream signals passing dual-fiber independently,avoids the crosstalk effectively,realizes bidirectional transmission at the same time,andimproves the survivability of network.2)The RN at the tangent point ensures the signal transmission between the primary ring and the sub-ring.This is a key to expanding and upgrading the network.3)The ORS is able to switch signals flexibly between dual fibers,which fixes single-fiber and dual-fiber faults effectively,and simplifies the system design.The simulation results show that the proposed scheme has better transmission performance and can expand and upgrade the network effectively.2.For the security transmission and protection issues of next generation optical access network featuring high-capacity and high-speed,a high reliable WDM-PON architecture with tree+ring topology is proposed,it can offer comprehensive protection by multi-level protection mode and realize wavelength reuse function in ONU by optical loop technology based on RSOA.The innovations of the scheme are as follows: 1)The novel design of topology has the characteristic of ring structure and tree structure,mature technology and powerful function.2)This scheme has high reliability,and it can provide protection to the system through different working mode.3)The RN in prime ring ensures the network scale expansion,information aggregation and mode switching.The fiber Bragg grating and filter has the function of reflection and filtering,and can effectively reduce the interference between the signal and improve system transmission performance.The simulation results show that the scheme has high reliability and can realize large scale expansion.