Fiberstore supply CWDM is really a low-cost WDM transmission technology

From the Internet,we know some information about fiber optic communication and we know that more and more important in life. So we must to know more info in fiber optic.CWDM(Coarse Wavelength Division Multiplexing) 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 is that with the DWDM: 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. As the wavelength interval of 20nm, the maximum wavelength shift of the system up to -6.5 ℃ ~ +6.5 ℃, the accuracy of the laser emission wavelength can be relaxed to ± 3nm, and the operating temperature range (-5 ℃ ~ 70 ℃), the temperature change induced wavelength drift is still within the allowable range, the laser without temperature control mechanism, so the structure of the laser is greatly simplified and the yield is increased.

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.

CWDM multiplexer technology, the biggest problem is still not obvious cost advantage relative to the DWDM equipment. Optical transceiver modules and optical devices is the key to reducing costs. However, due to the small market, suppliers shipments, so the device cost advantage is not obvious. Further, a method of reducing cost is to simplify the device function, this method leads to reduced system reliability and manageability. The DWDM product prices continue to lower to the CWDM technology a lot of pressure, and can form a complete metro DWDM network using DWDM technology, scalability, and the pressure of CWDM.

The number of the CWDM device supports optical channel (wavelength) is not more than 8, E-band optical transceiver module manufacturing process is not yet ripe, In addition, the elimination of the water absorption peak G.652C optic cable in existing network applications less E-band optical transceiver module market demand. The higher rate and farther transmission distance CWDM system there are still many technical problems. 10G system dispersion, ultra-broadband optical amplification technology. In addition, the standardization process needs to be accelerated, especially the to require operators boot service interface function. Therefore, we also launched DWDM 100g/200g Module for your choice.