Application of the all optical signal processing and the high-sensitive sensing devices based on the utilization of multi-channel fiber Bragg grating

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In the first part of this research, a novel all-optical simultaneous pulse multiplication and shaping approach is proposed, which is based on the simultaneous utilization of two amplitude-assisted phase-only spectral filters realizable by using a short fiber Bragg grating. In the second part of this research, a novel scheme for quantitative calibration of a phase-shift formed in a linearly chirped fiber Bragg grating is numerically and experimentally demonstrated and applications of the phase-shift FBG to both the temperature and the refractive-index sensor have been proposed and numerically demonstrated. Finally, a novel approach to calibrate a phase-shift formed in a long-period fiber grating (LPG) is firstly proposed and numerically demonstrated. By using a CO2laser with high-repetition-rate pulses emission, an equivalent phase-shift is successfully created at middle of the LPG. As application of the proposed calibration scheme, measurement for the temperature and the refractive index of the ambient solution has been proposed and successfully demonstrated by using a phase-shifted LPG.