Usually, a CWDM Mux Demux is used to increase the current fiber cable capacity by transmitting multiple wavelengths, typically up to 18 separate signals over one fiber. This article will give an overview of the CWDM Mux in networking and describe how to install a CWDM Mux Demux system with step-by-step details.

CWDM Mux Demux Module Overview

CWDM Mux Demux module is a passive device, very reliable and simple to use. These devices are available with a variety of wavelength combinations, usually from 1270 nm to 1610 nm (20nm spacing). Based on different applications, a CWDM Mux Demux module can be designed into different channels. A typical 4-channel Mux Demux module will be used to multiplex four different wavelengths onto one fiber (shown in the picture below). This allows you to simultaneously transmit four different data over the same fiber. If you are using a CWDM multiplexer at the beginning of your network, you will need to use a CWDM demultiplexer at the opposite end to separate or demultiplex the wavelengths to allow them to be directed to the correct receivers. Usually, a CWDM Mux Demux is a module that can be used as a multiplexer or demultiplexer at either end of the fiber cable span. However, it must still be used in pairs.

CWDM Mux Demux System Installation Components

A basic CWDM Mux Demux system comprises a Local unit, the CWDM Mux Demux module and a Remote unit. Usually a Local or Remote unit refers to two different switches. In general, to install a CWDM Mux Demux module, a chassis should be installed first to hold the module. Besides, to connect a CWDM Mux Demux module to a switch, CWDM SFP transceivers should be installed in the switch first. Then use the single mode patch cables to connect the transceivers to the CWDM Mux Demux module. Therefore, when building a CWDM Mux Demux system, the mux installation components needed are rack-mount chassis, CWDM Mux Demux module, CWDM SFP transceivers and single mode patch cables.

CWDM Mux Demux System Installation Steps

To install a CWDM Mux Demux system, there are four basic steps:

The CWDM rack-mount chassis can be mounted in a standard 19-inch cabinet or rack. When to attach the chassis to a standard 19-inch rack, ensure that you install the rack-mount chassis in the same rack or an adjacent rack to your system so that you can connect all the cables between your CWDM Mux Demux modules and the CWDM SFP transceivers in your system.

Install the CWDM Mux Demux Modules

To insert a module, you should align the module with the chassis shelf (shown in the figure below) first and then gently push the module into the shelf cavity. Finally, tighten the captive screws.

Connect the CWDM Mux Demux to Switch

After inserting the CWDM SFP transceiver into the switch, then we should use the single mode patch cable to connect the transceiver to the CWDM Mux Demux.

Please mind that CWDM Mux Demux pairs must carry transceivers with the same wavelength. Because each transceiver will work only at the appropriate port and the data will always flow between devices with the same wavelengths. CWDM SFP transceivers with different wavelengths may have different color codes.

Connect the CWDM Mux Demux Pairs

Once you use a CWDM multiplexer on one end of your networks, you must use a demultiplexer on the other end of the networks. Therefore, the last step to complete CWDM Mux Demux system is to connect the Mux Demux pairs (or multiplexer and demultiplexer). For a duplex Mux device, a pair of single mode patch cables must be used. For simplex Mux Demux, only one single mode patch cable is enough. After all is done, a CWDM Mux Demux system is then installed successfully.

Conclusion

In summary, the Mux Demux system is a cost-effective solution which is easy to install. CWDM Mux Demux, CWDM multiplexer only, and CWDM demultiplexer only are a flexible, low-cost solution that enables the expansion of existing fiber capacity and lets operators make full use of available fiber bandwidth in local loop and enterprise architectures.