Assertion: drop multiplexer | /r/HasProperty | cwdm oadm
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text: An optical add/drop multiplexer (CWDM OADM) subsystem is a wavelength selective branching device (used in WDM transmission systems) having a wavelength “drop” function in which one or more optical signals can be transferred from an input port to either an output port or drop port(s) depending on the wavelength of the signal.