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Design of Long-Period Fiber Grating Refractometric Sensors With Linear Response by a Genetic Algorithm

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3 Author(s)
Flores-Llamas, I. ; Fac. of Eng., Nat. Autonomous Univ. of Mexico, Mexico City ; Svyryd, V. ; Khotiaintsev, S.N.

A new method for the design of optical fiber refractometric sensors based on nonuniform long-period fiber gratings (LPFGs) is presented. A specialized genetic algorithm (GA) with properly designed operators is a fundamental element of this method and performs the theoretical synthesis of a necessary nonuniform LPFG period profile. Such a profile yields a linear response of the sensor to the refractive index of the external medium. A distinctive feature of the designed LPFG is a linear gradient of the core and cladding refractive index along the grating length. Also, a new mathematical model of nonuniform LPFGs is presented, the model permits to take into account the effect of some LPFG sections of a lower and others of a higher cladding refractive index than that of the external medium. The application of both the design method and the mathematical model is illustrated with a numerical example.

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Sensors Journal, IEEE  (Volume:8 ,  Issue: 7 )