5G technology will provide better quality of service, lower latency, and higher bandwidth, which will help improve user experience and create numerous new use cases. New technology requires massive investment in much denser radio networks and many new cells, which requires roll-out of optical CPRI fronthaul network. Smart usage of colored eCPRI 25G optical transceivers and passive WDM technologies can achieve great savings and maximum efficiency of existing fibers. Mixture of colored transceivers and Passive WDM Technology is excellent choice, as it’s flexible, enables many network topologies, it’s protocol and bit rate agnostic and eliminates need for independent power supplies. Passive WDM can help not only in fronthaul and backhaul in 5G, but also has a great potential in industrial class networks used in such industries as Manufacturing, Oil & Gas, Mining, Power etc.