全无源多位光相位噪声抵消
All-passive multiple-place optical phase noise cancellation
摘要：
本文报道了基于无源相位噪声抵消技术在总线型光纤网络中实现相干光频率的多点传输。与传统技术相反，该技术减轻了主光纤链路上和任意接入位置处的任何有源伺服控制器，在传统技术中，必须采用有源相位补偿电路来稳定主光纤链路。虽然当接入点靠近光纤链路末端时，该技术的残余光纤相位噪声功率谱密度（PSD）比传统多址技术的PSD高7倍，但它可以很大程度上抑制伺服凸起引入的相位噪声，提高响应速度和相位恢复时间，并且最小化具有许多站和连接的系统中的硬件开销，而不需要包括鉴相器和有源补偿器的有源伺服电路。所提出的技术可以大大简化未来的努力，使精确的光频率信号提供给许多用户，因为需要一些大规模的科学实验。
英文摘要：
We report on the realization of delivering coherent optical frequency to multiple places based on passive phase noise cancellation over a bus topology fiber network. This technique mitigates any active servo controller on the main fiber link and at arbitrary access places as opposed to the conventional technique, in which an active phase compensation circuit has to be adopted to stabilize the main fiber link. Although the residual fiber phase noise power spectral density (PSD) in the proposed technique turns out to be a factor of 7 higher than that of in the conventional multiple-access technique when the access place is close to the end of the fiber link, it could largely suppress the phase noise introduced by the servo bumps, improve the response speed and phase recovery time, and minimize hardware overhead in systems with many stations and connections without the need of the active servo circuits including phase discriminators and active compensators. The proposed technique could considerably simplify future efforts to make precise optical frequency signals available to many users, as required by some large-scale science experiments.
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