Laser secure communications system

摘要

A laser secure communications system is disclosed. The system utilizes a long laser cavity, the end reflecting members of which may be located many kilometers apart. One or more high gain laser amplifiers optically aligned within the long laser cavity provide the optical carrier energy. Laser oscillation only occurs if the remotely located end reflectors are optically aligned and if the laser gain is sufficient to overcome the round trip transmission loss. The optical carrier thus established is modulated and detected at either end of the laser cavity.