DWDM OADM is a passive optical add/drop multiplexer designed for metro access applications that represent the state of the art in fiber optics design. A dedicated wavelength can be dropped out of a fiber optic link that parallel transmits multiple DWDM wavelengths by using an add&drop multiplexer. All incoming wavelengths are received at one of the both line ports. The required wavelength/application are dropped by the so-called ‘‘drop‘‘ client port. This in the further course unused wavelengths can be connected with a new application by the socalled ‘‘add‘‘ port
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