Highly coherent linearly-swept fiber laser based on composite optical phase-locked loop

Yinxia Meng; Weilin Xie; Yuxiang Feng; Wei Wei; Yi Dong

doi:10.1117/12.2620470

26 July 2022 Highly coherent linearly-swept fiber laser based on composite optical phase-locked loop

Yinxia Meng, Weilin Xie, Yuxiang Feng, Wei Wei, Yi Dong

Proceedings Volume 12278, 2021 International Conference on Optical Instruments and Technology: Optical Communication and Optical Signal Processing; 122780C (2022) https://doi.org/10.1117/12.2620470
Event: 2021 International Conference on Optical Instruments and Technology, 2022, Online Only

Abstract

We present a dual-loop composite optical phase-locked loop (OPLL) composed of an acousto-optic frequency shifter based external modulation loop and a piezo based direct modulation loop for the generation of highly coherent swept-frequency fiber laser. It allows offering a larger loop bandwidth and gain, permitting an efficient linearization and coherence enhancement. We have verified experimentally a highly coherent swept-frequency fiber laser with a high fidelity and linearized frequency sweep with sweep range of ~8.2 GHz at ~164 GHz/s sweep rate, accompanied with a peak-to-peak frequency error as low as ~130 kHz. The in-band noise of the coherent beat note has been effective suppressed by almost 60 dB within a loop bandwidth up to ~80 kHz . The proposed linearly swept-frequency fiber laser provides a straightforward optimization of the real-time sweep control and far distance ranging in various scenarios, which is supposed to be a beneficial tool in both industrial and commercial applications.

Citation Download Citation

Yinxia Meng, Weilin Xie, Yuxiang Feng, Wei Wei, and Yi Dong "Highly coherent linearly-swept fiber laser based on composite optical phase-locked loop", Proc. SPIE 12278, 2021 International Conference on Optical Instruments and Technology: Optical Communication and Optical Signal Processing, 122780C (26 July 2022); https://doi.org/10.1117/12.2620470

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KEYWORDS

Modulation

Fiber lasers

Laser sources

Actuators

Acousto-optics

Single sideband modulation

Coherence (optics)

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