Wavelength Division Multiplexing (WDM) is a cost-effective and efficient method for increasing the capacity of existing fiber lines. This is achieved by dividing the fiber into channels with different wavelengths, allowing multiple signals to be transmitted over the same fiber. Each wavelength carries its own signal with full bandwidth. When needed, the systems can be expanded to gradually increase the transmission capacity of the line.
WDM technology was first tested in 1980, where two signals were transmitted through a fiber. Since then, the technology has evolved significantly, and today the system can handle up to 160 channels. Foss offers xWDM pre-assembled in panels with the required number of adapters and signals. We also provide the necessary measurement equipment for alignment and troubleshooting.
If you want to learn more about how wavelength division multiplexing works, you can read about it here.
All of these solutions are delivered as 1U panels or modular panels. They are based on reliable passive technology and come with SC or LC interfaces with PC or APC polished connectors.
The modules are mounted in dedicated panels (subracks) that are either 1U or 3U in size. A 1U panel can accommodate up to 3 modules, while a 3U panel can accommodate up to 12 modules. Different modules can be placed in any order in the panels, providing flexible and easy installation, as well as the option to expand with additional modules. Additionally, the modules offer high port density when the panels are fully populated, with up to 288 LC connectors on a 3U panel. Each module is complete with components for bidirectional communication terminated with LC connectors on the front. The panel can be mounted in a 19" rack.
The panels are ready to be mounted in a 19" rack, but by flipping the mounting brackets, they can also be mounted in a metric (ETSI) rack. When a panel is mounted in a 19" rack, the bracket can be moved forward by approximately 2 cm, allowing the panel to be positioned 2 cm further back in the rack. This provides better space in front of the panel, which is beneficial if there is limited distance to the cabinet doors, preventing cable bending.
Multiplexes 2 wavelengths, 1310 nm and 1550 nm.
Used, for example, when running 1 fiber to a subscriber, point-to-point in FTH (fiber to the home) network (downstream and upstream).
Multiplexes up to 18 wavelengths, utilizing the wavelength range of 1271 - 1611 nm.
20 nm spacing between channels.
Uses the wavelength range of 1528.77 - 1560.61 nm.
The standard defines even more wavelengths over a larger range, but the mentioned range is the most commonly used.
0.8 nm spacing between channels for 40 channels, 0.4 nm for 80 channels, etc.
Unlike CWDM, it can be amplified.
In a wavelength division multiplexing system (typically CWDM or DWDM), OADM components provide the capability to selectively remove (drop) and/or add individual wavelengths along the path between endpoints.
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