Comprehensive CWDM solution in Optical Fiber Transmission Network

I. Preface

1. Project Background:

Radio and television networks in a region in Guangdong Province have seen rapid business growth recently. The Education Network Access project is being developed in this region. In the early stage, optical fiber network resources were mainly used in cable TV networks, fiber-optic resources are not so rich. Many counties and towns do not have the remaining fiber-optic resources. Now we want to increase data services and try again on the fiber-optic cables that originally transmitted the cable TV network, should I re-lay another optical cable with the data signal of CERNET? This is the main task to be solved. Because many towns in this region belong to mountainous areas, it is inconvenient to lay optical cables. Considering resources, costs, and other factors, the radio/TV network company conducts comprehensive performance analysis and product testing on the CWDM System of Shenzhen haishuo Technology Co., Ltd., which specializes in fiber network access. He started to use multiple CWDM system devices for access to various node projects of the education network in areas such as.

2. Network Topology

The current CWDM project of the radio/TV network is mainly used to achieve the Mixed Transmission of Educational Network 10/100 Mbps Ethernet signal and cable TV network signal. Currently, there are eight connections in different directions, it shares three CWDM system devices produced by haishuo. Area A, one of the topology structures, is shown as follows:

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In this solution, A data center-B node transmits two 10/100 Mbps data signals and A cable TV signal, using WDM and CWDM access, two 10/100 Mbps signal after haishuo C5002S through haishuo HA-WDM multiplexing, and a cable TV signal at the same time to a fiber, transmission to B access point, the intermediate transmission distance of 50 km, a cwdm solution for hybrid transmission of cable TV and Ethernet signals on a single optical fiber.

Data center A-C node uses the haishuo C5002S system combined with OADM and CWDM terminal transceiver for effective integration, achieving 2-way 10/100 Mbps hybrid transmission on A single optical fiber.

The A-D-E uses the haishuo C5004S system combined with the OADM of each node and the corresponding CWDM transceiver to realize the 4-way 10/100 Mbps signal access project on a single optical fiber, and each point is connected through OADM, connect to the contact switch through the CWDM Optical Fiber transceiver. Four different signals are sent to different destinations at different wavelengths after the C5004S System in the data center, download the local signal through OADM, and the remaining three signals continue to be uploaded to the corresponding destination.

Ii. Features of CWDM access solutions

● Saving optical fiber resources

CWDMCoarse wavelength division multiplexing) is a coarse wavelength division multiplexing system. It uses optical multiplexing to reuse the wavelengths transmitted in different optical fibers to one optical fiber for transmission. At the end of the link, the optical fiber is used to recover the wavelength to the original wavelength. Only one channel of optical fiber is used on the entire link, which solves the problem of effective network access when the optical fiber resources are extremely tight. In this solution, 4 10/100 Mbps signals can also be 1000 Mbps at the same time between A-D-E on a fiber optic ), data center A-Node B loads Two 10/100 Mbps signals on an optical fiber that originally transmitted cable TV signals, saving A lot of optical fiber resources.

● Multiple services and high bandwidth

CWDM is a basic transmission platform that can adapt to the transfer according to the actual application rate. It supports multiple services. At each wavelength, the supported services include 10 M/100 M/155 M Ethernet services, 622 M/155 M/2g sdh services, and 622 M/m atm services, and Fiber Channel services. The entire system capacity can provide dozens of Gbps data signals. It fully satisfies the bandwidth needs of users for a considerable period of time. This solution uses a hybrid transmission of 10/100 Mbps services with cable TV signal services.

● High cost performance and convenient network upgrade

The cost of the CWDM system is much lower than that of the DWDM system. Because of its low power, small size and ease of use, the cost of supporting facilities, personnel training, and later maintenance is low. Compared with the optical fiber cable project, CWDM devices are enabled quickly, with low costs. Later network upgrades are convenient, and the desired signal is directly added or the product with a higher rate is replaced. You do not need to change the optical fiber link, the network upgrade is simple, reducing the network upgrade cost.

In the above scheme, if the A-D-E is replaced with a data signal of Mbps, the network is directly upgraded to 4 Gbps capacity.

Iii. Application of CWDM in Multi-Service hybrid Access Networks

With the improvement of people's living standard, today's single network access is gradually unable to meet people's current network needs. The characteristics of CWDM system to support multiple businesses are getting more and more attention, the CWDM system solution that can simultaneously provide E, FE, GE, STM-1/4/16 SDH, ATM signal, CATV and other video interfaces and other multi-business access can really meet the requirements of people now. The network structure is as follows:

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