MikroTik CWDM MUX/DEMUX 8-port module

The CWDM is a passive MUX/DEMUX unit, which allows you to combine up to 8 fibre links into 1, to simplify and reduce the cost of long distance fibre installations. The Coarse Wavelength-Division Multiplexing (CWDM) technology offers a solution which will increase the capacity of existing fibre infrastructure by enabling multiple channels/wavelengths over the same fibre cabling.
CWDM in your network will allow you to:

Increase efficiency of existing fibre network
Provide scalable and easy-to-deploy fibre channel services
Reduce electricity consumption
Reduce equipment maintenance and installation costs