CWDM is a low-cost WDM transmission technology for metro access layer. Principle, CWDM is the use of the optical multiplexer to different wavelengths of light signals multiplexed to a single optical fiber for transmission, at the receiving end of the link, with the optical demultiplexer fiber mixed signal is decomposed into different wavelengths signal, connected to the respective receiving apparatus. The main difference with the DWDM is that: 0.2nm to 1.2nm wavelength interval with respect to the DWDM system is concerned, CWDM has a wider wavelength interval, the industry accepted standards wavelength intervals of 20 nm. CWDM wavelength interval width, the technical requirements of the laser. And there are two mainly CWDM products which are CWDM Mux and CWDM Demux modules.
Additionally, a large wavelength interval means that the optical multiplexer/demultiplexer structure is greatly simplified. For example, a CWDM system filter coating floors can be reduced to about 50 layers, and the the DWDM systems 100GHz filter coating floors of approximately 150 layers, which leads to increased yield, cost reduction, and the supplier of the filter is greatly increased pro-competitive. CWDM filter of cost than DWDM filter costs less than 50%, the moreover, with the automated production technology and the bulk of the increase will be further reduced.
There are some advantages of CWDM.
First, the low equipment cost is the most important advantage of CWDM. It has been introduced in the front of the specific circumstances.
Second, it can reduce the operational costs of the network. You can use 220V AC power for the CWDM equipments because it is with small size, low power consumption, and easy to maintain and power supply. Because of its fewer number of wavelengths, the board backup volume is lower. There are no special requirements on the fiber using 8 wave CWDM devices, and G.652, G.653, G.655 fiber can be used, you can also take advantage of existing fiber optic cable. CWDM systems can significantly increase the transmission capacity of optical fiber and the optical fiber resources utilization. The MAN construction are facing certain degree of tension or expensive price to lease fiber fiber resources. Now the typical CWDM system can provide eight optical channels, and up to 18 optical channels in accordance with ITU-T G.694.2.
Third, the small size and low power consumption. CWDM lasers do not need thermoelectric cooler and temperature control function, so it is possible to significantly reduce the power consumption.
Fourth, good flexibility and scalability. For metro business terms, the business flexibility, particularly the speed of business provided and the ability to be expanded as the business development is very important. With CWDM technology users can opene a business in one day or a few hours, and with the increased volume of business, we can capacity expansion by inserting a new OTU board to improve the quality of business. CWDM system make it possible to recove the optical layer in MAN. Optical layer recovery is much more economical than electric layer recovery. Considering that the optical layer recovery is independent of the business and the rate, the original own institutional system of protection features (such as Gigabit Ethernet) can take advantage of CWDM to be protected.
Due to the above advantages of CWDM technology, CWDM get more and more applications in the field of telecommunications, broadcasting, enterprise network, campus network. The constraints of the CWDM product development critical factor is the price of optical transceiver modules and reuse demultiplexing. With the development of the market and the progress of the manufacturing process, further reduce the cost of equipment is an important direction of development. Also, the interface supports a variety of business development direction of CWDM. Now there are cheap CWDM Mux Demux on sale in FiberStore, which is the best Chinese fiber optic products supplier.
No comments:
Post a Comment