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光纤光栅是光纤传感和光纤通信领域的重要器件之一,光纤光栅的级联因其特性新颖一直是研究的热点。着重介绍了光纤布拉格光栅-长周期光纤光栅(FBG-LPG)级联结构在包层模式再耦合、边缘滤波和独立级联3方面的研究进展,讨论了各自的技术难点,并提出了改进意见。针对透射型FBG-LPG光路复杂的问题,提出一种反射型FBG-LPG独立级联结构,简化了光路,优化了系统性能,并进行了实验验证。在此基础上展望了FBG-LPG级联结构的发展趋势。
Fiber Bragg Grating is one of the most important devices in the field of optical fiber sensing and optical fiber communication. Because of its novel characteristic, the cascade of fiber Bragg grating has always been the hotspot of research. The research progress of the fiber Bragg grating-long period fiber grating (FBG-LPG) cascaded structure in the aspects of cladding mode re-coupling, edge filtering and independent cascade are introduced emphatically. The respective technical difficulties are discussed and some suggestions for improvement are given . Aiming at the complicated optical path of the transmissive FBG-LPG, a reflective FBG-LPG cascaded structure is proposed, which simplifies the optical path, optimizes the system performance and verifies it. On this basis, the development trend of FBG-LPG cascade structure is prospected.