xWDM transmission

Solutions for efficient data transmission.

The basis of modern teletransmission is fiber optic networks.


Use existing infrastructure to send more data on a single fibre.


The use of xWDM networks allows for reliable transmission.


The construction of the network allows for flexible expansion as required.

Stable, fast and reliable data flow

Ensuring stable, fast, and reliable data flow between the signal transmission and reception points is the main task of modern telecommunications. Transmission of data between points that are often hundreds or thousands of kilometers apart is a challenge in which fiber-optics networks play a key role. 


The xWDM technology is a so-called wave multiplication technology used to increase transmission capacity of existing fiber-optic networks. It is based on the multiplexing method in which multiple optical signals from different sources, with different power and different wavelengths, called colors, are transformed and transmitted simultaneously within a single optical fiber.


The letter "X" at the beginning of the technology's name is nothing more than a designation for the two main techniques involved. What exactly is it about? It is CWDM and DWDM. 


CWDM (Coarse Wavelength Division Multiplexing) allows to send up to 18 channels with wavelengths from 1271nm to 1611nm. On the other hand.


DWDM (Dense Wavelength Division Multiplexing) allows to transmit currently 96 channels. Often there are also solutions for transmission of 16, 40 and 80 channels. Additionally, DWDM technique is characterized by much longer transmission range than CWDM, which reaches up to several thousand kilometres.    


These techniques allow to increase effectiveness of optical fibres usage. They are characterised by compatibiliy with all network devices and scalability, thanks to which it is possible to freely add subsequent channels. A key feature is also transparency, as a result of which the system is transparent for any type of signal.   

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Check our xWDM solution including single fiber architecture systems.

Single Fiber solution based on Bi-Di (WDM) transceivers

This system is capable of transmitting 2 x 10G signals over single fiber. WDM coupler is a small passive device and can be mounted both in a switch cabinet and taken out e.g. to the cable well, which is a huge advantage when the location is a facility where fibers and space are leased.

Single fiber xWDM solution

These systems can transmit 4 x 10G signals over single fiber. It is fully customable – we can use mux/demux 2ch, 4ch and up to 18ch (for CWDM) and more (for DWDM). The quantity of channels is related to the max distance the transmission can be set due to increasing additional filter attenuation as the number of channels increases.


As you can see in presented schemes, we can design solution called IP over C/DWDM. Except standard xWDM solution, where the signals from client devices are connected to the transponders that convert signal to xWDM, we can also propose solutions in which xWDM transceivers are plugged directly into client devices such as switches, routers, etc., thanks to which the solutions can be much more cost-effective.

DWDM muxes with UPG port

For DWDM solution we can expand such system due to the possibility of using optical amplifiers, which allows to increase the distance at which the transmission can be set. In addition, to minimize the impact of the number of channels on the transmission range, we can use a R/B Coupler that connects muxed channels from both subbands.


As you can see in scheme, we apply there DWDM muxes with special UPG port, which allows for further expansion of this system with additional channels in the future if necessary.

The transmission range with optical amplifiers

Building such an extensive DWDM system (16 x 10G over single fiber), we can increase the transmission range by using optical amplifiers both in the form of preamps and boosters. You can see an example of such a system architecture.



Combining CWDM and DWDM multiplexing techniques

But it’s not over. We can also build an xWDM system that will combine both CWDM and DWDM multiplexing techniques and further increase the transmission capacity of such a system. So, by using a special OCL port of CWDM muxes, we can set additional 2x10G transmissions.


Moreover, except that CWDM filters can be use to increase total amount of available channels, these filters can also be use to increase the number of sites, as these filters do not have to be in the same locations as the DWDM filters.


We can design the system in such a way that one or even both CWDM filters are in the path of the fiber between between R/B Couplers and allow the user to Add/Drop their channels in different places than the end locations where DWDM filters are located.

What we can do for you?

Using wave multiplexing techniques, we are able to optimize transmission solutions, and thus also the costs incurred by our customers, and the solutions presented above are just some examples of possible xWDM system connection architectures.


There are many more real solutions that we are able to design, evaluate and present for specific case. For expamle, if 10G transmissions are not enough for you, we can also look for DWDM solutions with the possibility of transmission with higher bandwidth and instead of N x 10G, the system may be able to transmit N x 100G channels.

We integrate solutions, you achieve success!

FCA’s product offer is based both on its own solutions – produced in the optical fibre laboratory – and on products of global leaders of the ICT market.

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Teletransmission has no secrets for us

We have already implemented xWDM solutions for 43 clients in Poland. Hundreds of implemented nodes confirm that we have enormous experience both as a supplier and, most of all, as an integrator implementing solutions. 

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Do you want to increase the capacity of your network?

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