FPGA-driven random walk noise generation for tunable laser linewidth control

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Yu Zhou, Zu-Kai Weng, Keizo Inagaki, National Institute of Information and Communications Technology">Tetsuya Kawanishi

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Keywords: FPGA implementation, laser linewidth, phase modulator, phase noise, random walk noise, real-time

JOURNAL FREE ACCESS

2023 Volume 20 Issue 15 Pages 20230245

DOI https://doi.org/10.1587/elex.20.20230245

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Abstract

We propose a novel approach for real-time generation of random walk noise. Our approach aims to generate natural laser phase noise and construct a linewidth tunable laser. By utilizing field- programmable gate array circuits and digital-to-analog converters, we generate noise that is subsequently combined with low-frequency analog noise. This combined noise is then fed into a lithium niobate phase modulator to emulate phase fluctuations. Our method facilitates accurate control over the laser linewidth spectrum, closely approximating actual noise characteristics.

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