Laser Linewidth Measurement Using an FPGA-Based Delay Self-Homodyne System

Narrow-linewidth lasers play a crucial role in nonlinear optics, atomic physics, optical metrology, and high-speed coherent optical communications. Precise linewidth measurement is essential for assessing laser noise characteristics; however, conventional methods are often bulky, costly, and unsuitable for integrated applications. This paper presents a compact and cost-effective delay self-homodyne system for laser linewidth measurement, leveraging a field-programmable gate array (FPGA)-based data acquisition circuit. By employing fast Fourier transform (FFT) analysis, the system achieves high-precision linewidth measurement in the kHz range. Additionally, by optimizing the fiber length, the system effectively suppresses low-frequency and 1/f noise, providing an integrated and efficient solution for advanced laser characterization with enhanced performance and reduced cost.

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Publication Details

Journal
Photonics
Published
2025-02-26
DOI
https://doi.org/10.3390/photonics12030203
Citations
2
Primary Topic
Photonic and Optical Devices
Type
article
Field-Weighted Citation Impact
1.46

Funders

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article

Laser Linewidth Measurement Using an FPGA-Based Delay Self-Homodyne System

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Photonic and Optical Devices
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article

Laser Linewidth Measurement Using an FPGA-Based Delay Self-Homodyne System

Chen Zhao, Yaoyao Qi, Zhongan Zhao, Jie Ding, Fan-ge Bu, Yu Ding, Yanru Yin, Zhenxu Bai, Zhiwei Lü, Yulei Wang, Longfei Li, Tie Li, Cunwei Zhang
article en
2 citations

Abstract

Narrow-linewidth lasers play a crucial role in nonlinear optics, atomic physics, optical metrology, and high-speed coherent optical communications. Precise linewidth measurement is essential for assessing laser noise characteristics; however, conventional methods are often bulky, costly, and unsuitable for integrated applications. This paper presents a compact and cost-effective delay self-homodyne system for laser linewidth measurement, leveraging a field-programmable gate array (FPGA)-based data acquisition circuit. By employing fast Fourier transform (FFT) analysis, the system achieves high-precision linewidth measurement in the kHz range. Additionally, by optimizing the fiber length, the system effectively suppresses low-frequency and 1/f noise, providing an integrated and efficient solution for advanced laser characterization with enhanced performance and reduced cost.

PhotonicsVol. 12(3)
Hebei University of Technology (CN), National Engineering Research Center of Electromagnetic Radiation Control Materials (CN)
National Natural Science Foundation of China, Natural Science Foundation of Hebei Province, Natural Science Foundation of Tianjin City
Openalex Percentile: Top 19%
Photonic and Optical Devices
1.46
DOIOpen Access PDFOpenAlex
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