The system of DWDM WDM devices has a non-uniform temperature distribution over a wide wavelength range and therefore increases the cost of using the system of DWDM WDM devices when using cooling laser technology to regulate the temperature. The system of CWDM WDM equipment has lower requirements on the technical index of the laser, generally using uncooled lasers the system of DWDM WDM equipment needs to use cooling lasers, cooling lasers use temperature regulation to ensure that the DWDM system has better performance, higher safety and longer service life, so DWDM WDM is better than using uncooled lasers (4) CWDM WDM devices consume more energy than uncooled lasers.
(3) CWDM WDM equipment and DWDM WDM equipment modulation laser (2) CWDM WDM equipment and DWDM WDM equipment transmission distanceīecause the wavelengths of dense wavelength division multiplexing (DWDM) devices are highly integrated into the fibre-optic transmission process, DWDM WDM devices are able to transmit over longer distances than CWDM WDM devices, which are currently unable to transmit over unlimited distances, with a maximum distance of 160 km.DWDM WDM equipment can transmit over much longer distances than CWDM WDM equipment. DWDM devices can transmit 40, 80 or 160 wavelengths with a channel spacing of 0.8 nm. The channel spacing is defined as the difference in nominal carrier frequency between two adjacent optical channels and is generally used to prevent inter-channel interference.
(1) Channel spacing between CWDM WDM equipment and DWDM WDM equipment So how do you choose the right WDM equipment to build a cost-effective optical transmission system? What is the difference between CWDM WDM equipment and DWDM WDM equipment?Īn effective way to address the increasing bandwidth of information transmission today is to use CWDM WDM equipment and DWDM WDM equipment, but they differ in many ways. DWDM Dense WDM equipment has long-distance, high-bandwidth transmission capability CWDM coarse WDM equipment has a lower cost. In metro network construction (especially long-distance OTN optical transmission networks), WDM equipment is particularly important.
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