首页|Time-resolution enhanced multi-path OTD measurement using an adaptive filter based incoherent OFDR

Time-resolution enhanced multi-path OTD measurement using an adaptive filter based incoherent OFDR

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High accuracy and time resolution optical transfer delay[OTD]measurement is highly desired in many multi-path appli-cations,such as optical true-time-delay-based array systems and distributed optical sensors.However,the time resolution is usually limited by the frequency range of the probe signal in frequency-multiplexed OTD measurement techniques.Here,we proposed a time-resolution enhanced OTD measurement method based on incoherent optical frequency domain reflec-tometry[I-OFDR],where an adaptive filter is designed to suppress the spectral leakage from other paths to break the resolution limitation.A weighted least square[WLS]cost function is first established,and then an iteration approach is used to minimize the cost function.Finally,the appropriate filter parameter is obtained according to the convergence results.In a proof-of-concept experiment,the time-domain response of two optical links with a length difference of 900 ps is successfully estimated by applying a probe signal with a bandwidth of 400 MHz.The time resolution is improved by 2.78 times compared to the theoretical resolution limit of the inverse discrete Fourier transform[iDFT]algorithm.In addition,the OTD measurement error is below±0.8 ps.The proposed algorithm provides a novel way to improve the measurement res-olution without applying a probe signal with a large bandwidth,avoiding measurement errors induced by the dispersion effect.

optical transfer delay measurementtime resolution enhancementincoherent OFDRadaptive filtering

王立晗、任凌云、王祥传、潘时龙

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National Key Laboratory of Microwave Photonics,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaKey Research and Development Program of Jiangsu Province

6207509562271249BE2020030

2024

10.3788/COL202422.013901

中国光学快报(英文版)
中国光学学会 中国科学院上海光学精密机械研究所

中国光学快报(英文版)

CSTPCD
影响因子：1.305
ISSN：1671-7694
年,卷(期)：2024.22(1)
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