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The CWDM Mux Demux single fiber bidirectional solution supports CWDM channels in both directions over a single simplex singlemode fiber.  The principle difference between single fiber and dual fiber CWDM is the single fiber requires different wavelengths transmitted in either direction: A 4 channel CWDM single fiber system, for example, would require 8 different wavelength channels – The East (Mux/Tx) to West (Demux/Rx) direction would utilize 1470/1510/1550/1590 wavelengths; The West (Mux/Tx) to East (Demux/Rx) direction would utilize 1490/1530/1570/1610 wavelengths. CWDM Mux Demux can be ordered in many options: 2 to 9 Channels Wideband port 1310±50 & 1550±40nm Upgrade / Express port Monitor port LGX Module, Rack-mount, Cassette LC/APC, LC/UPC, SC/APC, SC/UPC