Multi-wavelength passive optical network system and protecting method thereof as well as multi-wavelength far-end nodes

Abstract

The invention provides a multi-wavelength passive optical network system and a protecting method thereof as well as multi-wavelength far-end nodes. The system comprises an optical line terminal, a plurality of multi-wavelength far-end nodes and a plurality of optical network unit groups, wherein the optical line terminal and the multi-wavelength far-end nodes form an annular network by an optical fiber, and an optical network unit group is connected to each multi-wavelength far-end node; different optical network unit groups adopt wavelength division multiplexing; optical network units in one optical network unit group multiplex a wavelength in a time division way, and the uplink wavelength and the downlink wavelength of the optical network unit group are equal. The optical line terminal comprises a first optical transmitting module, a second optical transmitting module, a first optical receiving module and a second optical receiving module, wherein the first optical transmitting module and the second optical transmitting module can transmit downlink signals along different directions, and the first optical receiving module and the second optical receiving module can receive uplink signals transmitted along different directions; and accordingly, when a network link generates failure, the annular network can still realize the receiving and the transmission of the signals in a place without failure after broken into two tree-shaped networks, thereby providing failure recovery at a telecommunication grade with lower cost.

Description

Technical field [0001] The present invention relates to the field of optical communications, in particular to a multi-wavelength passive optical network (WDM-PON) system, its protection method and a multi-wavelength remote node. Background technique [0002] Passive Optical Network (PON) is an ideal and long-term solution for access networks recognized in the industry. Ethernet Passive Optical Network (Ethernet Passive Optical Network, EPON) technology has been mature and large-scale application, 10Gb / s EPON (10GEPON), multi-wavelength Ethernet Passive Optical Network (Wavelength Division Multiplexed Ethernet Passive Optical Network, WDM-EPON) ), multi-wavelength and time-division multiplexing (Wavelength Division Multiplexing and Time-Division Multiplexing, WDM-TDM) hybrid PON has become the research hotspot of the next-generation broadband access network. 10GEPON inherits the traditional TDM EPON flexibility and technical simplicity, but There is no essential change in the wor...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a multi-wavelength passive optical network (WDM-PON) system, its protection method and multi-wavelength remote nodes, to solve the need for backup when the multi-wavelength passive optical network system in the prior art is protected Technical problems with high protection costs caused by key equipment

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