Abstract
We report on the simulation and characterisation of compound phase-shifted
fiber Bragg structures for use as novel in-fiber magneto-optical point
sensors. Through simulation we show that the Faraday rotation spectra of
phase-shifted gratings can be tailored by tuning the ratio of substructure
lengths. A design process for tailoring the magneto-optical spectrum is
illustrated, and it is shown that a general optimum structure exists for
producing a region of total reflection incorporating magneto-optical Faraday
rotation that is enhanced both in strength and spectral width. A practical
optical fiber system that exploits the proposed distributed feedback (DFB)
structures to enable novel all-fiber sensors for the dual measurement of
magnetic field strength and temperature is described in detail, and the
sensor response is simulated. The study is supported by laboratory
fabrication of the proposed fiber DFB structures which demonstrates the
principle of enhancement in terms of tailored group delay spectra and
highlights practical issues for sensor packaging.
© 2010 IEEE
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