Fiber Optic Components

WDM (wavelength division multiplexing) is one of the technology which can expand the capacity of a fiber optic network without requiring additional fiber, and it plays a very important role in long-haul data transmissions. In a WDM system, there is an important component called WDM Mux Demux (multiplexer/demultiplexer), which can multiplex multiple wavelengths into one single fiber to increase the network capacity. Usually there are three transmission modes in WDM networks: duplex bi-directional transmission, simplex bi-directional transmission and simplex uni-directional transmission. And this post will illustrate some detailed information about three transmission modes of WDM Mux/Demux. Duplex Bi-directional Transmission Mode In this transmission mode, one fiber only transmits one direction optical signal and the reverse optical signal will be sent by another fiber, which is often seen in dual fiber WDM Mux/Demux. And the same wavelengths can be used in t...