A modular optical cabling system converts and transmits digital electronic signals from a source such as a computer to any suitable target device such as a display or a projector through an optical backbone. A modular transmitting unit connects the source to a modular optical cable and converts the digital electrical signals to optical signals. A modular receiving unit receiver connects the modular optical cable to the target device and converts the optical signals to digital electrical signals. A directional modular optical cable connects between the transmitter unit and the receiver unit.