As we all know, in order to meet the increasing demand for higher bandwidth and faster transmission speed, more and more fiber optic cables have been put into use. However, as fiber infrastructures are getting more complicated, only adding numerous cables is no longer a feasible and economical option. Service providers and network managers are always seeking more cost-effective ways to enhance network capacity. Then do you know how to save fibers in your network to achieve economical cabling? Here may have the answer you want to know.
CWDM stands for Course Wave Division Multiplexing. It can combine or multiplex more than one wavelength over one fiber. The CWDM is limited to 16 wavelengths and is typically deployed at networks up to 80 km since optical amplifiers cannot be used due to the large spacing between channels. And it has a wide spectrum and accommodates eight channels. This wide spacing of channels allows for the use of moderately priced optics. Generally, CWDM is used for lower-cost, lower-capacity, shorter-distance applications where cost is an important decision factor.
The most common use of CWDM Mux/Demux is to increase fiber network capacity without at the expense of deploying more fiber cables, which service providers and network managers are seeking for. CWDM Mux/Demux modules are bidirectional optical multiplexers which enable several optical signals at different wavelengths to pass through a single fiber strand. It can combine up to 18 different wavelength signals coming from a single optical fiber to 18 separate optical fibers. It’s this feature that makes CWDM Mux/Demux a good choice for high bandwidth but low cost solution. Here are two common types of CWDM Mux/Demux.
The CWDM Mux/Demux over dual fiber is a universal device capable of coming up to 18 optical signals into a fiber pair. It can support up to 18 CWDM wavelengths between ITU-T G.694.2 1270 nm to 1610 nm in 20 nm increments or ITU-T G.652 1270 nm and 1290 nm. This CWDM Mux/Demux has good performance and excellent environmental stability. And it is typically used with optical amplifiers.
The CWDM Mux/Demux over single fiber can multiplex up to 18 optical single fibers and support a brand architecture such as scalable point-to-point links to two fiber protected rings. It can multiplex several channels such as 2, 4, 5, 8, 9, 16 and 18 channels on a single fiber, data rates or protocols over single fiber optic link without interfering with each other. Besides, this CWDM Mux/Demux is simple to be installed and requires no configuration or maintenance.
Some people may have doubts that DWDM is also a good solution for expanding network capacity. Of course, it does. However, comparing these two technologies—CWDM and DWDM, CWDM has more advantages. The main advantage of CWDM is the cost of the optics which is typically one-third of the cost of the equivalent DWDM optics. CWDM devices are popular with low cost, less power, less precision and lower maintenance requirements. In terms of the economic scale, not so many requirements need to exceed 80 wavelengths, which means that CWDM is easier to be accepted by many common customers.
CWDM Mux/Demux is a good solution for expanding network performance while keeping the cost low since you can send the same amount of signals with fewer fibers.