用于光学频率计量的嵌入式数字相位噪声分析仪
Embedded digital phase noise analyzer for optical frequency metrology
AI总结：
本文提出一种基于双核32位微控制器的嵌入式实时光信号处理方案，实现光学拍频IQ解调、城际光纤相位噪声分析与远程采集同步，兼具低成本、易配置和可升级优势。
摘要：
数字信号处理（DSP）正在支持光学干涉测量的新型现场应用，例如激光测距和分布式声学传感。虽然最高性能是通过现场可编程门阵列（FPGAs）实现的，但其复杂性和成本对于许多任务而言往往过高。在此，我们描述了一种基于双核32位微控制器的实时处理光信号的替代方案。我们实现了由独立激光源干涉产生的光学拍频信号的同相与正交（IQ）解调，对覆盖城际距离的已部署光纤进行相位噪声分析，以及通过光学触发信号同步远程采集。该嵌入式架构能够在光信号处理背景下高效完成多种任务，同时还具有易于配置、结构紧凑和可升级的特点。这些特性使其对于需要长期运行、远程操作和现场部署仪器的应用具有吸引力。
英文摘要：
Digital signal processing (DSP) is supporting novel in-field applications of optical interferometry, such as in laser ranging and distributed acoustic sensing. While the highest performances are achieved with field-programmable gated arrays (FPGAs), their complexity and cost are often too high for many tasks. Here, we describe an alternative solution for processing optical signals in real-time, based on a dual-core 32-bit microcontroller. We implemented in-phase and quadrature (IQ) demodulation of optical beat-notes resulting from the interference of independent laser sources, phase noise analysis of deployed optical fibers covering intercity distances, and synchronization of remote acquisitions via optical trigger signals. The embedded architecture can efficiently accomplish a large variety of tasks in the context of optical signal processing, being also easily configurable, compact, and upgradable. These features make it attractive for applications that require long-term, remotely operated, and field-deployed instrumentation.
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