High-accuracy and stable measurement of optical time delay based on an optical Hilbert transformer

Shupeng Li; Ting Qing; Meihui Cao; Xufeng Chen; Yijie Fang; Xiangchuan Wang; Shilong Pan

doi:10.1117/12.2591314

28 February 2021 High-accuracy and stable measurement of optical time delay based on an optical Hilbert transformer

Shupeng Li, Ting Qing, Meihui Cao, Xufeng Chen, Yijie Fang, Xiangchuan Wang, Shilong Pan

Proceedings Volume 11781, 4th Optics Young Scientist Summit (OYSS 2020); 117810C (2021) https://doi.org/10.1117/12.2591314
Event: Optics Frontier: Optics Young Scientist Summit, 2020, Ningbo, China

Abstract

High-accuracy optical time delay measurement is essential to optical beamforming networks, multi-antenna GNSS-overfiber systems, and clock synchronization networks. To meet the demand of high-performance measurement, a time delay measurement system via microwave phase shift analysis is proposed, in which a modulator bias controller (MBC) is employed to stabilize the bias point of Mach-Zehnder modulator. However, because the MBC is easy to lose lock in long-term use, the stability of the measurement system is limited. To overcome the above problem, we propose an enhanced measurement system, in which the intensity modulation is achieved using a phase modulator and an optical Hilbert transformer. To verify the performance of the proposed system, a proof-of-concept experiment is carried out. The measurement results show that an accuracy of ±0.05 ps is obtained.

Citation Download Citation

Shupeng Li, Ting Qing, Meihui Cao, Xufeng Chen, Yijie Fang, Xiangchuan Wang, and Shilong Pan "High-accuracy and stable measurement of optical time delay based on an optical Hilbert transformer", Proc. SPIE 11781, 4th Optics Young Scientist Summit (OYSS 2020), 117810C (28 February 2021); https://doi.org/10.1117/12.2591314

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