CWDM is short for coarse wavelength division multiplexing. CWDM technology is a method of combining multiple signals on laser beams at various wavelengths for transmission along a single fiber optic cable. CWDM system provides channels like 4, 8, 12 and 16 with the spacing of 20nm. The spectrum grid can remain from 1270nm to 1610nm when multiple wavelengths added to one fiber. It’s a cost effective choice for transporting large amounts of data traffic in telecoms or enterprise networks. Because CWDM can increase a fiber network capacity without deploying more fiber cables thus avoid fiber exhaust.
As mentioned above, CWDM is used to increase the amount of information that can be transmitted over a single fiber. Then the optical wavelength multiplexer (MUX) and the de-multiplexer (DEMUX) are indispensable components to deal with small numbers of wavelengths in this system.
What is CWDM Mux/Demux? The CWDM Mux/Demux is a device designed to allow multiple optical signals with different wavelengths to pass through a single optical fiber strand and split the multi-wavelength optical signals. For example, with a multiplexer at the beginning of the network, a typical 4 channel CWDM will be used to multiplex four different wavelengths onto one fiber. This means four different networks/systems can be transmitted over the same fiber simultaneously. At the opposite end of the network, a CWDM demultiplexer to demultiplex the wavelengths to allow them to be directed to the correct receivers. But usually CWDM Mux and Demux are integrated in an entirety. So the optical transmission is done by dual fibers where one fiber is transporting data from east to weat and vice-versa. With highly reliable passive optics certified for environmentally hardened applications, the CWDM Mux/Demux lets operators make full use of available fiber bandwidth in local loop and enterprise architectures. It’s a flexible, low cost solution that enables the expansion of existing fiber capacity.
The followings are the features of CWDM Mux/Demux:
- Long distance coverage of multiple signals on a single fiber strand
- Good flexibility and expansibility
- Low end-to-end insertion loss
- Extended operating temperature range suitable for remote office environments
- High optical fiber transmission capacity
- Simple to install, requires no configuration or maintenance
- Passive CWDM optical Mux/Demux design
- Low content delivery costs where dark fiber is available
Based on these features, CWDM Mux/Demux module can be applied in broad fields: enterprises and carriers with fiber optic infrastructure, transmitting additional applications with existing fiber cables, connecting buildings to CWDM campus ring, connecting field offices to cental office, ideal solution for metro-core, metro-access and enterprises.
Fiberstore supplies passive CWDM Mux/Demux with all channels except the common 4, 8, 16, 18 channel. All CWDM Mux/Demux modules suit Gigabit & 10G Ethernet, SDH/SONET, ATM, ESCON, Fibre Channel, FTTx and CATV, etc. And various optional port configurations are available such as Express Port, Monitor Port, 1310nm passband port and 1550nm port for these multiplexers according to your choice.