Digital Coherent Optical interferometric Sensing in Vibrometry Explosive Detection

摘要

Fast turbulence in turbid channel give rise to fast (～sub-ms to μs) power fades. Conventional adaptive optics does not have sufficient speed to track fast fading. An integrated optical beam combiner with adaptive control is proposed to mitigate fast fading of turbid channels in a space-diversity reception architecture. Simulation results of a lossless beam combiner showed that unity power combining efficiency can always be achieved regardless of the input optical power and phase distribution. The proposed device is applicable in a variety of digital coherent optical sensing applications such as in coherent laser radar, standoff explosives detection, and laser vibrometry that will be covered in the talk.