Light-beam stabilizing control in long-distance transmission systems subject to mechanical vibrations

The performances of various optical systems are inevitably influenced by mechanical vibration. In order to compensate the pointing errors of the light-beam caused by the mechanical vibration in long-distance light-beam transmission systems, a new scheme of light-beam stabilizing control is presented, which uses two position sensitive detectors to detect the pointing errors, and a single fast steering mirror to stabilize the jitter of the light-beam. An experimental setup was established and a series of experiments were conducted. The experimental results show that the pointing errors can be effectively suppressed, thus the newly proposed stabilizing technique is feasible. Finally, several suggestions on improving of the experimental setup are discussed.