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This article shows the development of a photonic detector of low‐frequency ultrasonic signals. These signals latter reach a sensitive single‐mode optical fiber as an acoustic guide conveying the signals (around 43 kHz) over 70 cm to a distant and protected in‐fiber Bragg grating. The grating reflects a spectrum centered around 1550 and 2.6 nm bandwidth and is interrogated by a tunable laser in their...