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为有效地阻挡长周期光纤光栅(LPFG)器件芯模,实现包层模提取技术,提出了利用磁流变液实现芯模阻隔(CMB)的新方法。从模式耦合理论出发,基于LPFG的单多模级联网络结构,分析了LP01模和HE13包层模与多模光纤(MMF)耦合效率随CMB器芯径的变化规律,并对CMB器尺寸进行了优化设计。根据理论分析结果,将磁流变液注入到半径为6.5μm的石英玻璃管,获得了带宽为4 nm、光隔离度为25 dB的带通滤波器。与传统的芯模自对准光刻法相比,本文方法大幅度地缩短了工艺周期、降低了加工成本、提高了产品的质量,满足了批量化生产的要求。
In order to effectively block the mandrel of long period fiber grating (LPFG) device and realize the extraction of cladding mode, a new method to realize core block (CMB) by using MRF was proposed. Based on the theory of mode coupling, based on the LPFG single multi-cascade cascaded network structure, the variation law of the coupling efficiency between LP01 mode and HE13 cladding mode and multimode fiber (MMF) with the core diameter of CMB was analyzed, and the size of CMB Optimized design. According to the results of theoretical analysis, a magneto-rheological fluid was injected into a quartz glass tube with a radius of 6.5 μm to obtain a band-pass filter with a bandwidth of 4 nm and an optical isolation of 25 dB. Compared with the traditional self-aligned lithography core mode, this method significantly shorten the process cycle, reduce processing costs and improve the quality of products to meet the requirements of mass production.