Stacked wavelength-division and time-division multiplexing passive optical network transmission system based on OFDM (orthogonal frequency division multiple)

Abstract

The invention provides a stacked wavelength-division and time-division multiplexing passive optical network transmission system based on OFDM (orthogonal frequency division multiple). The stacked wavelength-division and time-division multiplexing passive optical network transmission system comprises an optical line terminal, a feeder optical fiber and a plurality of passive optical network systems. The passive optical network system comprises a remote node, a plurality of distributed optical fibers and a plurality of optical network units. The optical line terminal is connected to the remote node through the feeder optical fiber, and the remote node is connected to the optical network units through the distributed optical fibers. The stacked wavelength-division and time-division multiplexing passive optical network transmission system provided by the invention utilizes the OFDM technology to enable downlink transmission data to have a high dispersion resisting capacity, improves the access capability of the passive optical network (PON), and has the advantages that the passive optical network transmission system is easy to upgrade and reconstruct on the basis of the existing network and the system cost is low.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to an OFDM-based passive optical network transmission system with stacked wavelength division and time division multiplexing. Background technique [0002] With the emergence of a large number of new services, some ultra-high-definition High Definition Television, HDTV TV, local and global storage area networks, large file sharing, cloud storage / cloud computing, social networking, etc., constitute the threat of bandwidth bottlenecks, which pose a threat to the access network The symmetry of uplink and downlink bandwidth puts forward higher requirements. Therefore, the existing EPON / GPON technologies are difficult to meet the ever-increasing demand for bandwidth. In order to improve system transmission capacity, meet the requirements of high-bandwidth business development, and realize high-capacity, long-distance transmission of PON systems, IEEE and ITU-T FSAN have fo...

AI Technical Summary

Problems solved by technology

The placement of the arrayed waveguide grating will change the structure of the optical distributed network in the laid network system, which is inconsistent with the direction of the adhesive clearly stipulated in the NG-PON2 upgrade plan, so it cannot be used as an NG-PON2 Program

At the same time, the article adopts OFDM modulation on different wavebands of the same wavelength, and the uplink receiving process at the OLT end will generate large optical beat frequency noise interference, which cannot be suppressed

Therefore, this architecture is not conducive to the expansion and upgrade of the next generation passive optical network

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