7 December 1998 Mitigation of the speckle effect in incoherent lidar systems using telescope arrays
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Abstract
We investigate the gain in ensemble average and the variance reduction of the total power received by a telescope array compared to a single-aperture system in a typical lidar scenario. For these parameters, we give both limiting expressions and curves taking into account the speckle- related statistical dependences of the power coupled into different subapertures as a function of the number of subapertures, the subaperture spacing, and the ratio of transmit aperture size to receive subaperture size. The improvement of the array with respect to average coupled power is found to be nearly 3dB at the most, the reduction of the coupled power's variance depends on the array geometry. As coupling light into singlemode fibers is closely related to optical heterodyning, our results also represent a generalization for the carrier-to-noise ratio improvement of an optical phased array employing a 'maximal ratio' heterodyne receiver.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter J. Winzer, Peter J. Winzer, } "Mitigation of the speckle effect in incoherent lidar systems using telescope arrays", Proc. SPIE 3494, Atmospheric Propagation, Adaptive Systems, and Lidar Techniques for Remote Sensing II, (7 December 1998); doi: 10.1117/12.332430; https://doi.org/10.1117/12.332430
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