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中，提出了一种新的全光同步脉冲倍增和整形方法，该方法基于同时利用两个可通过短光纤布拉格光栅实现的振幅辅助纯相位光谱滤波器。在本研究的第二部分，对线性啁啾光纤布拉格光栅中形成的相移进行了数值和实验验证，并对相移光纤光栅在温度和折射率传感器中的应用进行了数值验证。最后，提出了一种校正长周期光纤光栅相移的新方法，并进行了数值验证。通过使用具有高重复率脉冲发射的co2激光器，在LPG中间成功地产生了等效的相移。作为所提出的校准方案的应用，提出了测量温度和周围溶液的折射率，并成功地证明了使用相移液化石油气。

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.