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

在本研究的第一部分，提出了一种新的全光同时脉冲倍增和整形的方法，这是基于同时利用两个振幅辅助的相位只有光谱滤波器实现使用短光纤布拉格光栅。在本研究的第二部分中，一种新的方案，用于定量校准的相移形成在线性啁啾光纤布拉格光栅的数值和实验证明和应用的相移光纤光栅的温度和折射率传感器已提出和数值演示。最后，首次提出了一种新的方法来校准在长周期光纤光栅（LPG）中形成的相移。利用高重复频率CO2激光器，在长周期光纤的中部成功地产生了等效相移。作为所提出的校准方案的应用，测量的温度和周围的溶液的折射率已被提出，并成功地证明了使用相移LPG。

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.