DWDM is an acronym for Dense Wavelength Division Multiplexing. DWDM refers to a laser technology that combines certain optical wavelengths that can be transmitted over a single fiber. The use of DWDM technology helps in increasing the bandwidth of an existing fiber-optic network and allows the transmission of signals of several wavelengths simultaneously.
In any DWDM system, there are two important components called Mux (Multiplexer) and Demux (Demultiplexer). In this blog, we will help you understand the working of DWDM Mux/Demux by explaining how mux and demux work in a DWDM system.
What is a DWDM Mux/Demux?
To understand DWDM Mux/Demux, you will need to know what exactly DWDM is. To be precise, Dense Wavelength Division Multiplexing (DWDM) is an optical wavelength multiplexing technology that allows you to expand the bandwidth capacity of an existing fiber optic network.
The data streams coming from different sources are combined or multiplexed together on an optical fiber, wherein each signal travels at the same speed on its own wavelength.
In a DWDM system, a multiplexer is a module located at the transmitter end where several data signals are combined and transmitted over a single fiber, while a demultiplexer is a module at the receiver end where combined data signals are split and each signal is passed through a separate channel to an optical receiver.
As a result, a DWDM Mux/Demux module is designed to multiplex several DWDM channels into one or two fibers. DWDM mux/demux systems not only extend the fiber optical network’s bandwidth but also lower the cost, making them an ideal network solution for data transmission.
How does DWDM Mux/Demux work? What is its working principle?
In DWDM network architecture, the structure starts with transceivers that accept data input from a range of traffic types and protocols. This transceiver or forwarder performs the mapping of input data to a separate DWDM wavelength. Each individual wavelength carrying different kinds of data is fed into a multiplexer. The multiplexer filters and combines multiple wavelengths onto a single output port for transmission via the main DWDM fiber.
At the receiving end, the combined wavelengths are isolated and restored to their original form with the help of a demultiplexer. Each wavelength is separated and passed onto a separate channel, which is then routed to the respective client-side output through additional wavelength-matched transponders or transceivers.
What are the different types of DWDM Mux/Demux?
DWDM Mux/Demux can be divided into two types:
- Active DWDM mux/demux
- Passive DWDM mux/demux
The DWDM mux/demux that needs a power supply is called an active DWDM mux/demux. However, the one that doesn’t need a power supply is called passive DWDM mux/demux.
Active DWDM Mux/Demux
An active DWDM mux/demux consists of a wavelength-adjustable laser, wavelength-adjustable filter, and wavelength-selective amplifier. It provides you more control over the optical network where you can dynamically re-tune wavelengths without dropping connections. It is mainly used in large-capacity optical transmission applications.
Passive DWDM Mux/Demux
A passive DWDM mux/demux is an unpowered, pure optical equipment that requires zero maintenance, upgrades, or power to function. It consists of a dispersion device, interference device, optical coupler, and more. It is simple to use and is typically used in the access layer of MAN, campus network, enterprise network, etc.
Are you looking for DWDM Mux/Demux for your application? If yes, connect with DK Photonics today.