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Evaluation and implementation of cone tracking for free-space optical communication with a retromodulator

机译:带有逆调制器的自由空间光通信的圆锥跟踪的评估和实现

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摘要

Cone tracking is a well-known method to optimize the pointing of a beam, and has been reported previously in the case of direct-mode free-space optical communication links, using a beacon or a dedicated wavelength to carry the feedback. In a retro link, because the beam is reflected back to the transmitter, feedback data are locally available. We present here the results of an evaluation (both simulation and experiments) of the cone-tracking technique applied to a retro link and how the implementation can be optimized for this specific case. We show that, using only a small number of samples (as few as 16 with 625-Hz modulation frequency), we can retrieve the pointing error. We finally demonstrate cone tracking (a closed loop maintaining the beam center on the retrore-flector) with modulation amplitude as low as 1% of the beam divergence.
机译:锥体跟踪是一种优化光束指向的众所周知的方法,并且在直接模式自由空间光通信链路的情况下,先前已经报道过,它使用信标或专用波长来承载反馈。在回溯链路中,由于光束被反射回发射器,因此反馈数据在本地可用。在这里,我们介绍了应用于追溯链接的圆锥跟踪技术的评估(模拟和实验)结果,以及如何针对此特定情况优化实现方式。我们证明,仅使用少量样本(在625 Hz调制频率下只有16个样本),就可以检索指向误差。最后,我们演示了锥跟踪(将光束中心保持在后偏转器上的闭环),其调制幅度低至光束发散的1%。

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