DAS over 1,007-km Hybrid Link with 10-Tb/s DP-16QAM Co-propagation using Frequency-Diverse Chirped Pulses

Publication Date: 2/15/2023

Event: Journal of Lightwave Technology

Reference: 41(4): 1077-1086, 2023

Authors: Ezra Ip, NEC Laboratories America, Inc.; Yue-Kai Huang, NEC Laboratories America, Inc.; Ming-Fang Huang, NEC Laboratories America, Inc.; Fatih Yaman, NEC Laboratories America, Inc.; Glenn Wellbrock, Verizon; Tiejun Xia, Verizon; Ting Wang, NEC Laboratories America, Inc.; Koji Asahi, NEC Corporation; Yoshiaki Aono, NEC Corporation

Abstract: We report the first distributed acoustic sensing (DAS) experiment with over >1,000 km reach on a hybrid link comprising of a mixture of field and lab fibers with bi-directional inline Raman amplification after each span. We used 20× frequency-diversity chirped-pulses for the probe signal,and recovered the Rayleigh backscatter using a coherent receiver with correlation detection and diversity combining. A measurand resolution of ∼100 pϵ/√ Hz at a gauge length of 20 meters achieved in the offline experiment. We also demonstrate the first real-time FPGA implementation of chirped-pulse DAS without frequency diversity over a range of 210 km.

Publication Link: https://ieeexplore.ieee.org/document/9937060