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WDM works by simultaneously combining and transmitting multiple signals at different wavelengths but within the same fiber. 
This enables effective management of bandwidth and also helps to expand the capacity of existing system Fibre Optic components and modules.

WDM is protocol and bit-rate independent. These networks can transmit data in IP, ATM, SONET/SDH, and Ethernet.
They can handle bit rates between 100 Mb/s and 40 Gb/s. Therefore, WDM type networks can carry different types of traffic at different speeds over an optical channel.

Optosuns production lines have now been increased to cover the full product range of WDM devices, module, and module integration, including thin-film filter (TFF) base WDM products, and also fused fiber base coupler WDM products.