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Single-frequency fiber laser at 1.5 µm with an 89 Hz linewidth and near shot-noise-limited intensity noise
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DOI：10.1364/AO.586894.png)
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Abstract
En 中文
In this paper, a distributed Bragg reflector single-frequency fiber laser (SFFL) operating at 1550 nm with ultra-narrow linewidth and near shot-noise-limited intensity noise is demonstrated experimentally. The low-noise fiber laser employs a short linear-cavity based on Er3+/Yb3+ co-doped phosphate fiber, achieving stable single-longitudinal-mode operation through a multi-technique noise-suppression scheme. By incorporating self-injection locking, pump noise optimization, optoelectronic feedback, and the gain saturation effect of a semiconductor optical amplifier to improve the noise performance, the SFFL exhibits a linewidth of less than 89 Hz. The relative intensity noise of the fiber laser is reduced to near the shot-noise limit (-156 dB/Hz at 1 mW), with measured values of approximately-152.5 dB/Hz in the 2-10 kHz frequency range and-155 dB/Hz in the 1-10 MHz frequency range. Furthermore, the optical signal-to-noise ratio exceeds 70 dB, and the polarization extinction ratio is greater than 26 dB. These combined techniques enable the SFFL to simultaneously achieve an ultra-narrow linewidth (sub-100 Hz level) and low intensity noise, rendering it suitable for demanding applications such as coherent optical communications, precision metrology, and laser cooling. (c) 2026 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.
Keywords:
SELF-INJECTION LOCKING
OPTICAL-FEEDBACK
DFB-LASER
SUPPRESSION
STABILIZATION
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1.7
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798
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5.1W
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