Phase demodulation of hybrid 3×3 coupler and Sagnac interferometer for φ-OTDR by Binyuan Yang, Binyuan Yang, Tingyu Wang, Jianzhong Zhang, Jianzhong Zhang, Zhe Ma, Zhe Ma, Xiang He, Xiang He, Lipu Liu, Lipu Liu, Yixuan Wang, Yixuan Wang, Mingjiang Zhang, Mingjiang Zhang

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