Quadrature amplitude modulation for electronic sideband Pound-Drever-Hall locking

arXiv - PHYS - Optics Pub Date : 2024-09-13 DOI:arxiv-2409.08764

J. Tu, A. Restelli, T. -C. Tsui, K. Weber, I. B. Spielman, S. L. Rolston, J. V. Porto, S. Subhankar

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Abstract

The Pound-Drever-Hall (PDH) technique is routinely used to stabilize the frequency of a laser to a reference cavity. The electronic sideband (ESB) locking scheme, a PDH variant, helps bridge the frequency difference between the quantized frequencies enforced by the cavity and the laser frequency of interest. Here we use quadrature amplitude modulation (QAM), a technique used in digital signal communication, to engineer the high-quality phase-modulated radio-frequency (rf) signal required for ESB locking scheme. We develop a theoretical framework to analyze the effects of in-phase/quadrature-phase (I/Q) impairments on the ESB error signal for ultra-narrow linewidth lasers. We design and implement two baseband-sampling software-defined radio variants for implementing QAM that compensate for these I/Q impairments. Using these variants, we engineer high-quality phase-modulated radio-frequency (rf) signals with a large phase modulation index of 1.01 radians, a maximum modulation frequency of 3 MHz, a tunable carrier wave frequency range of 450 MHz to 4 GHz, and I/Q errors of less than 2.25 % over the entire carrier wave frequency range.

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用于电子边带庞德-德莱弗-霍尔锁定的正交调幅技术

庞德-德莱弗-霍尔（Pound-Drever-Hall，PDH）技术通常用于将激光频率稳定在参考腔上。电子边带（ESB）锁定方案是 PDH 的一种变体，它有助于弥合腔体强制执行的量化频率与激光频率之间的频率差。在这里，我们使用数字信号处理技术中的正交调幅（QAM）来设计 ESB 锁定方案所需的高质量相位调制射频（RF）信号。我们建立了一个理论框架来分析超窄线宽激光器的同相/正交相位（I/Q）损伤对 ESB 误差信号的影响。我们设计并实现了两种基带采样软件定义无线电变体，用于实现补偿这些 I/Q 损伤的 QAM。利用这些变体，我们设计出了高质量的相位调制射频（rf）信号，其相位调制指数高达 1.01 弧度，最大调制频率为 3 MHz，可调载波频率范围为 450 MHz 至 4 GHz，整个载波频率范围内的 I/Q 误差小于 2.25%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv - PHYS - Optics

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