Understand Ports On CWDM and DWDM MUX DEMUX
It is quite common to use CWDM or DWDM to increase the existing fiber optic network without adding any fibers. Using WDM MUX/DEMUX is necessary to build a CWDM or DWDM network. Now there are different ports installed on the CWDM and DWDM MUX DEMUXs to add more beneficial to the fiber optic network. This post will offer details about the ports on CWDM and DWDM MUX DEMUX.The basic function of the CWDM and DWDM MUX DEMUX is combining data rate of different wavelengths over the same fiber cable to increase the network capacity. Thus, channel ports supporting different wavelengths and Line port used to connect the WDM MUX/DEMUX are the must-have ports for these devices.
CWDM uses 18 wavelengths ranging from 1270nm to 1610nm with a channel space of 20nm. low price Channel port count on CWDM MUX DEMUX is usually ranging from 2 to 18. The following picture shows a full-channel CWDM MUX DEMUX with all the 18 CWDM wavelengths: 1270nm, 1290nm, 1310nm, 1330nm, 1350nm, 1370nm, 1390nm, 1410nm, 1430nm, 1450nm, 1470nm, 1490nm, 1510nm, 1530nm, 1550nm, 1570nm, 1590nm, 1610nm.DWDM uses the wavelength ranging from 1470nm to 1625nm usually with channel space of 0.8nm (100GHz) or 0.4nm (50GHz). DWDM MUX DEMUX can support much more wavelengths that of CWDM MUX DEMUX. The channel port of a DWDM MUX DEMUX is usually ranging from 4 to 96.
There are two types of line port available for CWDM and DWDM MUX DEMUX. One is dual fiber line port, and the other is single fiber line port. The selection of the line port depends on applications. The WDM MUX DEMUX with a single fiber line port is very different from the WDM MUX DEMUX with a dual fiber line port on the using of wavelengths.
Dual-fiber MUX DEMUX uses the same wavelength for dual-way transmission, which means the TX port and RX port of every duplex channel port supporting the same wavelength. The WDM MUX/DEMUXs with dual fiber line ports installed on the two ends of the network could be the same.For single-fiber WDM MUX DEMUX, all the wavelengths just flow in one direction. And the TX port and RX port of every duplex channel port supporting two different wavelengths. The above picture shows the front panel of an 8-channel DWDM MUX DEMUX with single-fiber line port. As it is clearly marked the TX port and RX port use different wavelengths. If you choose a single-fiber WDM MUX DEMUX on one side of the network, there should be a single-fiber WDM MUX DEMUX which supports the same wavelengths but has the reverse order on the TX port and RX port of every duplex channel port. Please note, the line port of some single-fiber CWDM MUX DEMUXs is made into a duplex port, but one one port is function. Here takes the example of FS.COM FMU CWDM MUX DEMUX as an example, as shown in the following picture, the single-fiber CWDM MUX DEMUX has a duplex port, but one of the port marked as “N/A” is not in use.
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