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18 December 2023 Application of sine-cosine demodulation technology in linewidth measurement of narrow linewidth single frequency laser
Penghui Yao, Zhen Zhang, Junnan Zhou, Yingxin Jia, Ye Jin, Xiaosong Ma
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Proceedings Volume 12968, AOPC 2023: Optic Fiber Gyro ; 1296819 (2023) https://doi.org/10.1117/12.3007133
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China
Abstract
The linewidth of a single frequency laser plays an important role in improving the detection distance of a distributed optical time-domain reflectometer (OTDR). The commonly used linewidth measurement method is the delayed self heterodyne interferometer (DSHI). However, it is usually difficult to calibrate the linewidth of fiber laser (less than 1 kHz) with DSHI， because which requires the optical path difference of interferometer to be far greater than the coherence length. We accurately characterized the laser linewidth based on the sine-cosine optical frequency analysis of the 3×3 coupler Michelson interferometer. First, we accurately and rapidly detected the change of optical frequency under the stable state of laser, and then analyzed and accurately obtained the linewidth through the power spectral density (PSD) of frequency noise. The linewidth of the 1550 nm single frequency fiber laser is accurately detected and with 0.8 kHz, which is close to the technical parameter table with the linewidth of 1 kHz. Our work is important for selecting the light sources in φ-OTDR and other applications and points to a standard and convenient method in the field of the linewidth measuring.
(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Penghui Yao, Zhen Zhang, Junnan Zhou, Yingxin Jia, Ye Jin, and Xiaosong Ma "Application of sine-cosine demodulation technology in linewidth measurement of narrow linewidth single frequency laser", Proc. SPIE 12968, AOPC 2023: Optic Fiber Gyro , 1296819 (18 December 2023); https://doi.org/10.1117/12.3007133
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KEYWORDS
Laser frequency
Fiber lasers
Michelson interferometers
Laser applications
Modulation
Vibration
Demodulation
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