CWDM (Coarse Wavelength Division Multiplexing) also known as sparse Wavelength Division Multiplexing system, is an economical and practical short-distance WDM transmission system. With the rapid growth of Internet IP data services, the demand for transmission line bandwidth continues to increase. Although DWDM wavelength division multiplexer technology is an effective way to solve line bandwidth expansion, CWDM technology has advantages over DWDM in terms of system cost, versatility, and maintainability. In the metropolitan area network application, it is more and more recognized by everyone and has been put into practical use. The bottleneck of network transmission bandwidth has gradually shifted to the metropolitan area network, and the construction of metropolitan area network has become a hot spot of current network construction. Due to the unique advantages of Coarse Wavelength Division Multiplexing (CWDM) technology, it has been paid more and more attention in the construction of metropolitan area networks.
Coarse Wavelength Division Multiplexing (CWDM) system can effectively save fiber resources and networking costs. It solves the two problems of fiber shortage and transparent transmission of multiple services. It is mainly used in the convergence and access layer of the metropolitan area network, and can construct the network and carry out business in a short time. Now CWDM has a large number of applications in metropolitan area network transmission.
The Application of CWDM Wavelength Division Multiplexer
Coarse wavelength division multiplexer CWDM does not have high requirements for optical fiber systems, especially the early installation of fiber optic core projects. As long as the power of the system is surplus, it can quickly achieve multiplication and expansion without upgrading the original system.The original system can be upgraded without the need of adding fiber cores for major projects, which is very flexible.
Coarse wavelength division multiplexer CWDM can transmit 2 or more asynchronous signals in the same optical fiber, which is conducive to the compatibility of digital signals and analog signals, and can be flexibly taken out or added to channels in the middle of the line. The sharing of active equipment is increased, and low-cost upgrades can be achieved for the transmission of multiple signals and the addition of new services.
Optical path index of Coarse wavelength division multiplexer CWDM
Central wavelength: 1470nm, 1490nm, 1510nm, 1530nm, 1550nm, 1570nm, 1590nm, 1610nm
Wavelength interval: 20nm
Optical passband width: +/- 6 nm
The temperature drift of the emission center wavelength: 0.08nm-0.1nm/°C
The transmitted light power of each wave: -5dBm～+3dBm
Received optical power per wave: -24dBm～-3dBm
Receiving sensitivity: <-32dBm
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