Industrial fibre optic cable products provide smooth and reliable communication for power utility,networking and telecommunications. Interconnection of data and power equipment enables process control,instrumentation and telecommunications. Fibre converters are specifically designed to convert media signals to fibre mode and vice versa. Fibre optics is the transmission medium for long distances,high bandwidths and high data rates. Some LAN standards for fibre optic data communications are fibre-distributed data interface,Ethernet,fibre channel,SDH,SONET and multiplexing. With the introduction of DWDM,bandwidths up to 40 Gbps and beyond are possible without eavesdropping. Miniaturisation and all-optic-fibre transmission are the ongoing research areas.