We present a novel fiber optic hydrogen sensor with fast response fabricated from a graphene-Au-Pd sandwich nano film and an ultrashort fiber Bragg grating. The response time is only 4.3 s at a 3.5 vol% hydrogen concentration. When the measured hydrogen concentration was increased from 0 to 4.5 vol%, the optical resonance dip in the sensor at near 1550 nm shifted by 290 pm. In addition, the sensor has an insertion loss of only −2.22 dB, spectral contrast of 10.8 dB, and spectral finesse of 5.
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