Abstract
We propose and demonstrate a microfiber Fabry–Perot
interferometer (MFPI) fabricated by taper-drawing microfiber at the center
of a uniform fiber Bragg grating (FBG). The MFPI employing the two separated
sections of FBG as reflectors and a length of microfiber as its cavity is
derived. Theoretic study shows that the reflection spectrum of such MFPI is
consisted of two parts – interference fringes induced by multi-beam
interference and reflection spectrum envelope induced by FBGs. Temperature
affects both interference fringes and reflection wavelength of FBGs while
ambient refractive index (RI) only influences the interference fringes, i.e.,
MFPI has different response to temperature and RI. Therefore, MFPI for simultaneous
sensing of RI and temperature is experimentally demonstrated by tracking a
reflection peak of interference fringes and the Bragg wavelength of the FBGs,
which are respectively assisted by frequency domain processing and Gaussian
fitting of the optical spectrum. Consequently, wavelength measurement
resolution of 0.5 pm is realized.
© 2013 IEEE
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