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9 October 2021 High-accuracy distributed optical fiber transfer delay measurement based on optical stepped-frequency chirp signal
Cong Ma, Yue Yang, Fengting Cao, Xin Jiang, Xi Liu, Shangzhe Xu, Xiangchuan Wang, Shifeng Liu, Shilong Pan
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Proceedings Volume 11894, Optoelectronic Devices and Integration X; 118940D (2021) https://doi.org/10.1117/12.2601375
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China
Abstract
High-accuracy measurement of optical fiber transfer delay (OFTD) is essential to applications such as distributed optical fiber sensing, radio over fiber networks, and optically controlled phased array radars. However, it is difficult to simultaneously acquire high accuracy and high spatial resolution transfer delay distributed in different positions along the optical fiber path. Here, we propose an approach to measure the distributed OFTD based on optical stepped frequency chirp signal (OSFC) enabling sub-millimeter-level spatial resolution and sub-picosecond-level accuracy. Thanks to an optical frequency shifting loop, an OSFC signal with ultra-wide bandwidth of up to hundreds of GHz can be obtained. By coherent de-chirping and fusing the OSFC signal, high-accuracy and high-spatial-resolution distributed OFTD measurement can be achieved. In a proof-of-concept experiment, an OSFC signal with a bandwidth of up to 320 GHz was generated, achieving 0.29-mm spatial resolution and ±0.05 ps accuracy distributed OFTD measurement.
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Cong Ma, Yue Yang, Fengting Cao, Xin Jiang, Xi Liu, Shangzhe Xu, Xiangchuan Wang, Shifeng Liu, and Shilong Pan "High-accuracy distributed optical fiber transfer delay measurement based on optical stepped-frequency chirp signal", Proc. SPIE 11894, Optoelectronic Devices and Integration X, 118940D (9 October 2021); https://doi.org/10.1117/12.2601375
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KEYWORDS
Spatial resolution
Optical fibers
Phased array optics
Signal processing
Modulation
Optical testing
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