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

A technology for optical line terminals and multicast services, which is applied in the field of optical communication and broadband access optical fiber, to achieve the effects of reducing implementation costs, saving wavelength resources, and expanding bandwidth utilization

Active Publication Date: 2008-02-06
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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Embodiment Construction

[0029] Using the above principles, the following describes in detail the WDM-PON system using the SCM method to implement multicast in the present invention with reference to the accompanying drawings. Figure 3 is a schematic structural diagram of an embodiment of a WDM-PON system for implementing multicast services in the present invention. In Figure 3, the WDM-PON system consists of an optical line terminal (OLT), an optical fiber distribution network (ODN), and n optical networks Unit (ONU), the ONU and OLT are connected through the optical fiber distribution network.

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

[0031] ...

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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 present invention relates to optical communication technology, in particular to broadband access optical fiber technology, and specifically to 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), ultra-high-speed DSL (VDSL), and their rates range from 56K to several megabits. 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. The above-mentioned several general access methods can no longer meet the transmission requirements. Therefore, the demand for using optical fiber to lay the access network is growing rapidly. Passive optical netwo...

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Application Information

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