OFDMA (Orthogonal Frequency Division Multiplex Address)-based mixed passive optical network transmission system

Abstract

The invention discloses an OFDMA (Orthogonal Frequency Division Multiplex Address)-based mixed passive optical network transmission system comprising an optical line terminal, an array waveguide grating, a feeder optical fiber and a plurality of sub passive optical networks, wherein the sub passive optical networks consist of remote nodes and a plurality of optical network units connected with the remote nodes by distributed optical fibers. By adopting a two-stage access technology and using a fixed wavelength channel, the optical network transmission system has simple structure, is easy to realize, can be updated and reformed on the basis of the traditional passive optical network and meets the requirements of an access network on long distance and wideband; meanwhile, compared with the wavelength division multiplexing passive optical network system structure for adding users by increasing the wavelength, the invention can reduce the cost of the system to a certain degree.

Description

technical field [0001] The invention relates to a system in the technical field of optical communication, in particular to an OFDMA-based hybrid passive optical network transmission system. Background technique [0002] With the acceleration of triple play process and the emergence of new services - ultra-high definition High Definition Television, HDTV TV, local and global storage area network, large file sharing, high-definition video on demand, video conferencing, online interactive games, indoor digital theater family Networks, etc. constitute the threat of bandwidth bottlenecks, and at the same time require large-capacity, long-distance, and multi-service communications. Therefore, the future Fiber To The Home, FTTH requires broadband access and long-distance high-capacity communication. [0003] Passive optical network, PON, as a low-cost solution to the problem of fiber-to-the-home access terminals, is the mainstream direction of current access network technology res...

AI Technical Summary

Problems solved by technology

However, in the uplink transmission of this architecture, all optical network units finally upload data through a single wavelength channel, and the increase in the number of users causes the increase of subcarrier channels, resulting in a decrease in the number of subcarriers allocated to each optical network unit, which affects broadband Access, and then the architecture is not conducive to the expansion and upgrade of the passive optical network; at the same time, the structure cannot realize long-distance passive optical network communication

Images