As is known to all, CWDM and DWMD are closely related, both of which adopt WDM technology and can simultaneously transmit multiple optical wave lengths in a single fiber. However, CWDM is suitable for short distance transmission, while DWDM is suitable for long distance transmission. In addition, there is also a big difference in power consumption and cost.

Power consumption

In general, whether CWDM system or DWDM system, use the passive components, the power consumption of the system the difference between the different main source of light module, and CWDM module’s power consumption is usually lower than light DWDM optical module’s power consumption, such as optics CWDM Wan Zhao light module maximum power consumption is 1.2W, and DWDM Wan Zhao light module in 0~70℃ under the working temperature of maximum power consumption is 1.5W, in -40~85℃ under the working temperature of maximum power consumption is 1.8W, so relatively CWDM system power consumption is lower than the DWDM system power consumption.

The cost

The cost difference between CWDM and DWDM systems is mainly reflected in hardware and operating costs.

With the increase of the total number of wavelength multiplexed and the increase of single channel transmission rate, power consumption becomes a key factor in the circuit board design of the system. Compared with DWDM system, CWDM system without refrigerated laser has low power consumption and can effectively save cost.

Although DWDM and CWDM are using DFB laser as light source, but the DWDM to prevent wavelength drift caused by temperature changes to the filter channel multiplexer and demultiplexer, need to use cooling technology (that is, the cooler) to control the temperature change and stable wavelength, sometimes, also can use wavelength lock to ensure the accuracy of wavelength and stability, and CWDM don’t need cooling, such as wavelength locking technology, greatly reduces the cost of equipment, the current CWDM system costs usually only 30% of the cost of DWDM system.

By above knowable, CWDM technology and DWDM technology has the same principle, relative to the latter and the former has the advantages of low cost, low power consumption, etc. As a result, the CWDM technology construction of metropolitan area network or the network capacity is one of the most effective and the most economic choice can greatly reduce network cost, adapt to constantly enrich and increase of the business, to solve the problem of the ratio of the expansion and metropolitan area network construction.

HTF is based on the present, looking to the future

With the substantial increase of network communication data volume and the increasing capacity of optical communication network, CWDM technology will become an ideal low-cost solution for MAN construction due to its low cost, flexible topology and multiple access service types. HTF based on the existing business needs and requirements for the future network development, launched a one-stop optical transmission network system, including the CWDM coarse wavelength division multiplex, CWDM coarse sparkling points multiplexer, CWDM optical module (e.g., CWDM SFP, CWDM SFP+), etc., can provide reliable for operators, flexible, efficient and low cost solution.