Dark Fibre What is Dark Fibre? Dark fibre refers to unused or unlit optical fibre cables that are available for private use. Organisations lease dark fibre to build customised, high-capacity networks. Explanation Unlike standard internet services, dark fibre networks are owned and managed by businesses, providing complete control, enhanced security, and low latency. These are especially useful for large-scale data transfers and private communication. Practical Example of Dark Fibre A financial firm might use dark fibre to establish a dedicated connection between offices and data centres, ensuring high-speed, secure communication for trading operations.