A compact all-optical tunable fiber filter based on a few-mode optical fiber modal interferometer coated with graphene epoxy resin composite material is proposed and experimentally demonstrated. The interferometer is constructed with a 2-cm FMF connected to two single mode fibers. After coating the graphene epoxy resin composite material on the outside of the interferometer, it shows the all-optical wavelength tunability, and experimental results show that the wavelength shift changes quasilinearly with the pump power changing. The wavelength tunable range reaches 5.062 nm with a step of 0.016 nm/mw. It is expected to have practical application in optical communication, fiber sensing, fiber laser and optical spectrum analysis.

提出并实验证明了一种基于涂覆有石墨烯环氧树脂复合材料的少模光纤模态干涉仪的紧凑型全光可调光纤滤波器。干涉仪由连接到两根单模光纤的 2 厘米 FMF 构成。在干涉仪外部涂覆石墨烯环氧树脂复合材料后，表现出全光波长可调性，实验结果表明波长漂移随泵浦功率变化呈拟线性变化。波长可调范围达到 5.062 nm，步长为 0.016 nm/mw。有望在光通信、光纤传感、光纤激光器和光谱分析等方面具有实际应用。