TWO-WAY OPTICAL COMMUNICATIONS SYSTEM

摘要

An optical communications system comprises a transceiver arranged to provide two-way communication over an optical communications channel (3). The transceiver comprises a semiconductor light source (4) and a detector (5). The semicondutor light source (4) provides optical signals for transmission via the optical communications channel (3), and the detector (5) detects optical signals received via the optical communications channel and converts said optical signals into electrical signals. Means (2, 2a, 2b) are provided for modulating the output of the semiconductor light source (4) wiht an RF carrier having a first frequency. Said electrical signals are passed through a filter (8) adapted to filter out signals at said first frequency.