CWDM Coarse Wavelength Division Multiplexing for Metropolitan Area Networks

With the rapid development of industry informatization, the demand for long-distance and large-capacity bandwidth has increased rapidly, resulting in rapid growth in traffic at the access layer, metropolitan layer, and backbone network. However, relying on bandwidth leasing and direct fiber connection can no longer meet the customer requirement
WDM is an ideal technology for such status of optical transport network and advantages . If the DWDM technical architecture and system design of backbone are used in metropolitan area networks, the advantage of DWDM in long-distance expansion cannot be exerted; in addition, the demand for the number of channels of metro expansion is relatively small compared to the backbone system. Moreover, the distance is short without optical amplification requirement, which make CWDM Coarse Wavelength Division Multiplexing technical solution particularly suitable for the metropolitan optical transmission network.
The problems of the current metropolitan optical transmission network :
1.In the metropolitan area network, the optical fiber resources are relatively lack, and there is an urgent need to increase the utilization rate of the existing optical fiber resources;
2.Metropolitan area network has dense business points and is very sensitive to cost;
3.The metropolitan area network interface is complex and there are many types of services;
4.The network topology changes frequently.

For these problems, CWDM Coarse Wavelength Division Multiplexing system has the following advantages
1. Price advantage: CWDM effectively reduces the technical requirements for devices, simplifies the design, and reduces costs;
2. High system reliability: no need to use EDFA, no need to use temperature control technology to stabilize the wavelength, and there is no temperature controlled AWG device, which greatly enhances the reliability of the system;
3. Flexible system design: Due to the optical transmission technology below 2.5G, under the condition that the distance is less than 100 kilometers, it is only limited by the attenuation of the optical fiber, and the configuration of the repeater is quite flexible;
4. Simple installation and maintenance: The small size, light weight and low power consumption of the equipment make it very easy to install and maintain.
5. Multi-service, multi-protocol, and multi-service particle support: Flexible support for various service interfaces, from 100M to 2.5G, with convenient network management networking mode, providing comprehensive alarm and performance detection.
to sum up CWDM Coarse Wavelength Division Multiplexing System is favored by operators for the Metropolitan network because of its low cost, convenient use and many other advantages.