Hybrid passive optical network system

Abstract

The invention relates to a mixed type passive optical network system which comprises a plurality of optical line terminals, a coarse wavelength division multiplexing and demultiplexing device, an optical branching device, and a plurality of optical network units, wherein, each optical line terminal occupies two different wavelengths of coarse wavelength division multiplexing standards, and the two different wavelengths are respectively used for transmitting optical signals of a transmitting end and a receiving end of the optical line terminal; the optical branching device is provided with a plurality of ports and connected with the coarse wavelength division multiplexing and demultiplexing device through an optical fiber; the network units are connected with corresponding ports of the optical branching device through optical communication. The invention adopts mature coarse wavelength division technologies to make a plurality of mutually independent EPON systems enter into a single optical fiber through simultaneous superposition of different CWDM optical wavelengths and simultaneously be shared by each ONU through the optical branching device. By adoption of the topological structure, the invention has the advantages of great conversation of optical fiber resources connected between metropolitan area networks and cells, simultaneous further exertion of EPON advantages, capability of flexibly increasing user number, reduction of cost of each line, and acceleration of promotion of an EPON network.

Description

technical field [0001] The present invention relates to Passive Optical Network (PON) systems. Background technique [0002] The passive optical network (PON) provides the connection between the optical line terminal (OLT) and multiple optical network units (ONU), and shares the optical fiber medium between the OLT and the remote node (RN). This service has the advantages of transparency, etc., and at the same time, PON can smoothly transition to fiber-to-the-home (FTTH), so it has a bright development prospect. [0003] Ethernet Passive Optical Network (EPON) is a power-splitting passive optical network, which adopts star coupler for branching, and uplink / downlink transmission adopts time division multiple access (TDMA) / time division multiplexing (TDM) to realize shared channel bandwidth. It uses optical power distribution, which limits the number of ONUs and affects further network expansion. [0004] One OLT can be installed on each optical fiber of the traditional EPON...

AI Technical Summary

Problems solved by technology

Although it can save a lot of optical fiber resources compared with traditional transmission methods, the development of EPON is still seriously affected due to the lack of original optical fiber resources in China.

If the optical fiber is re-laid, this will lead to a very expensive cost of the entire network, and at the same time have a serious impact on the existing network

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