Next-generation wavelength division multiplexing (WDM) Systems Development – WDM, transmission networks, WDM-network broadcasting industry
Of: Ministry of Industry and Information Technology Research Institute of Telecommunications Communicate Standards Institute Zhang Haiyi
Business network on the transmission network demand
Comprehensive information services and multimedia services in the proportion of business operators continue to improve, encourage people to demand changes in working life, the business diversified telecommunications network to accelerate the trend of hair, HeavyReading analysis, telecommunications networks, many of its main business including commercial users, mobile users and residential customers business.
Business users business Business needs of commercial users for the business network transmission network to provide high quality connectivity, including data centers, business users Gigabit connectivity, storage and disaster recovery to ensure the rate of multi-megabit Internet access, video conferencing and Broadcasting , Business phone.
Evolution of business development of commercial users mainly in: IP-VPN, Ethernet VPNs, Storage Area Network SAN to support high-bandwidth business needs, provide network high availability and high security, and fast delivery and client service to end fault management and positioning.
Business mobile users Mobile user business requirements of the transmission network includes wireless metro access aggregation, such as 3G wireless, Wi-Fi access transmission, WiMAX infrastructure, next-generation data services, high quality pictures, wireless video, games, Digital TV And so on.
Fixed / mobile convergence is reflected in public demand for the network convergence layer (L2/L1/L0 in the network to provide traffic grooming); support the continued evolution of access technologies; reduce the number of independent backbone network to optimize network structure, lower network construction and maintenance costs; multi-service OAM, providing high availability and recoverability of network support.
Residential customers business Future demand for residential customers business reflected in the triple play and IPTV , 100 TV Channels, on-demand video, video recording / playback, interactive video applications, multi-megabit Internet access, distance learning and games.
According to the characteristics of business and residential customers demand service for residential customers next-generation optical networking technology, driven mainly reflected in: a substantial increase bandwidth; support unicast and multicast services business efficient transmission; support the access technology continue to evolve (eg: ATM turned to Ethernet); on voice and video services to provide high reliability of transmission protection.
Current system basically point to point WDM network based on the business of monitoring management mainly through the wavelength converter to support SDH-B1, J0 byte and so on and so on to achieve a single channel WDM system has 40G of commercial, to meet the large demand for transmission capacity router port network service combined with the future development needs. Next-generation WDM system should meet the business network of high-capacity transmission requirements; to provide high reliability and survivability, with a complete networking capabilities; to meet the large capacity of multi-service transparent transmission needs; provide a flexible intelligent networking capabilities.
Next-generation WDM system development trend Meet the demand for high-capacity transmission
WDM systems increase transmission capacity by increasing the system's access number and improve the single-channel load rate to achieve, improve the system's access number and extended through the use of narrow band channel spacing, channel spacing of view from now to achieve 50GHz spacing, in C 80 wavelength bands can be achieved, L-band wavelength 80 can also be achieved by extending the band, not only to use C-band, you can use L-band, by the degree of current commercial devices, the actual capacity requirements and other factors affect the actual commercial systems are C-band, the maximum number of channels is about 80 to 96 waves.
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