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WDM-PON method, system and optical line terminal for implementing multicast service

An optical line terminal and multicast service technology, applied in the fields of broadband access fiber and optical communication, to achieve the effects of simple system implementation, expansion of bandwidth utilization, and reduction of implementation costs

Active Publication Date: 2011-08-10
HUAWEI TECH CO LTD
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Problems solved by technology

[0008] In order to solve the problems faced by the existing WDM-PON system when implementing multicast services, the present invention provides a WDM-PON method, system and optical line terminal supporting multicast services, which are realized by subcarrier multiplexing (SCM, Subcarrier Multiplexing) Multicast Service of WDM-PON System

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  • WDM-PON method, system and optical line terminal for implementing multicast service

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[0029] Utilizing the above principles, the WDM-PON system for realizing multicast by using the SCM method of the present invention will be introduced in detail below in conjunction with the accompanying drawings. image 3 Shown is the structural representation of the WDM-PON system embodiment that realizes the multicast service of the present invention, image 3 Among them, the WDM-PON system consists of an optical line terminal (OLT), an optical distribution network (ODN), and n optical network units (ONUs). The ONU and the OLT are connected through an optical distribution network.

[0030] Figure 4 It is a schematic diagram of the structure of the OLT. The OLT is mainly composed of: switching unit, IGMP (Internet Group Management Protocol, Internet Group Management Protocol) message processing and control unit, multicast data replication and forwarding unit, downlink multiplexing and modulation transmitting unit, uplink receiving and The demodulation unit and the first cir...

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Abstract

The present invention discloses a method, system and optical line terminal of WDM-PON for realizing multicast service. The method comprises the following steps: the optical line terminal copies a multicast group data according to demand massage of the multicast group from each optical network unit, and conducts subcarrier multiplexing to the multicast group data and downlink unicast data which are then modulated to optical signals with different wavelength, and then compounds the optical signals with different wavelength into a downlink mixed optical signals; an optical fiber distributive network routes respectively the optical signals with different wavelength in the downlink mixed optical signals to optical network units with relevant wavelength, and the multicast group data and / downlink unicast data in the downlink optical signals with relevant wavelength is restored by each optical network unit. The invention provides a method that the multicast group data and the unicast data are mixed to be transported to ONU, which improves the bandwidth utilization rate of single wavelength, ensures QoS of the multicast and unicast in a better manner, which is good for the popularization of IPTV.

Description

technical field [0001] The invention relates to optical communication technology, in particular to broadband access optical fiber technology, specifically a WDM-PON method, system and optical line terminal for realizing multicast services. Background technique [0002] The existing Internet service access methods that are more commonly used generally include: dial-up modem, asymmetric digital line subscriber line (ADSL), cable modem (CM), and very high-speed DSL (VDSL). Wait. However, people's demand for high-quality video information services and video-on-demand (VoD: Video on Demand) services will increase day by day. In the future, broadband access will require a transmission rate of more than 100 Mbps. However, the above-mentioned several common access methods can no longer meet the transmission requirements. Therefore, the demand for laying access networks using optical fibers is growing rapidly. Because the passive optical network (PON) has the advantages of huge ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J14/02H04B10/20
Inventor 林华枫黄伟赵峻江涛
Owner HUAWEI TECH CO LTD
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