LASER TELECOMMUNICATIONS SYSTEM

摘要

The output of a spectrum stabilised transmitting laser (5, 15) is angle modulated by a signal to be transmitted and is coupled to a monomode optical fibre link (8). A second spectrum stabilised laser (10, 15) is located at the other end of the link. Each laser is arranged so that it can be injection locked by a signal received from the other so that it can oscillate in synchronism with the other laser. This arrangement provides a bi- directional link. Also disclosed is a demodulator for demodulating angle modulated optical signals.