A compact and universal digital lock-in amplifier design for broad optical spectrum capturing

Yunliang Li; Zheyi Yao; Zhiqiang Gao; Jia Qian; Heng Zhang; Guohua Gu; Qian Chen; Xiubao Sui; Lingyuan Meng

doi:10.1117/12.2615555

26 July 2022 A compact and universal digital lock-in amplifier design for broad optical spectrum capturing

Yunliang Li, Zheyi Yao, Zhiqiang Gao, Jia Qian, Heng Zhang, Guohua Gu, Qian Chen, Xiubao Sui, Lingyuan Meng

Proceedings Volume 12279, 2021 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 122790C (2022) https://doi.org/10.1117/12.2615555
Event: 2021 International Conference on Optical Instruments and Technology, 2022, Online Only

Abstract

This paper reports a compact, universal and all-digital lock-in amplifier design to complete the broadband optical spectrum signal measuring, which can be utilized in the optical spectrum analysis, coded Brillouin optical time-domain sensors, and ultra-low optical signal capturing. With the development of the integrated circuit these days, all the components, including the phase detector, reference signal generator, and complex calculators, required in such system are built digitally, leading to a compact and universal design that can be implemented in the various situations. Furthermore, benefited from the 24-bit analog-digit converter (ADC) employed in the design, this lock-in amplifier has achieved a real-time dynamic range over 100dB.

Citation Download Citation

Yunliang Li, Zheyi Yao, Zhiqiang Gao, Jia Qian, Heng Zhang, Guohua Gu, Qian Chen, Xiubao Sui, and Lingyuan Meng "A compact and universal digital lock-in amplifier design for broad optical spectrum capturing", Proc. SPIE 12279, 2021 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 122790C (26 July 2022); https://doi.org/10.1117/12.2615555

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