Applied Optoelectronics recently announced the availability of 25 Gbps local area network-wavelength division multiplexing (LWDM) cooled transistor outline (TO) packaged laser diodes for 5G front-haul applications. In emerging 5G networks, the front-haul link is the critical fiber-optic segment between the antenna unit (radio head) and the remotely located base station, from which connections to the wider telecommunications network emanate.