This passive optical demultiplexer is available in 4-channel, 8-channel or 8-channel with an Add/Drop expansion port for connecting to an additional 4 or 8-channel optical demultiplexer (16-channels total). Each unit either combines or separates 4 or 8 individual wavelengths respectively to provide optical multiplexing over one singlemode fiber. All units are compatible with Meridian’s other CWDM digital products. These product will combine or separate following optical wavelengths.