The transmission characteristics of a nonuniform photonic fiber Bragg grating (PFBG) are studied in detail by FEM
furnished with 1st - order BGT - like TBC and transfer matrix method. The effects of the air hole size on PFBG's
transmission properties such as effective index, Bragg reflective wavelength, normalized bandwidth and centre
wavelength shift are investigated. It is believed the study can provide useful information for PFBG's design and
optimization with a more effective and accurate method.
A novel fibre Bragg grating (FBG) hydrophone system is introduced in the paper. The influence of the sound pressure on
the FBG is transformed to light intensity measurement with tuned laser. Elastic material and matched FBGs are
employed to enhance the sensitivity of the hydrophone system. The hydrophone system can operate in a wide acoustic
frequency range from 100Hz to 3kHz and good linear relationship is observed between the output light intensity and the
sound pressure.
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