基于耦合模理论的光纤耦合器应变特性研究

Study of Fiber-Optic Coupler Strain Characteristic Based on Coupling Mode Theory

根据单模光纤耦合器的输出功率的比值对耦合区长度变化敏感的特点,分析了熔融拉锥型光纤耦合器的工作原理。采用螺旋测微仪对光纤耦合器的应变特性进行研究,避免了悬臂梁结构自重、梁的振动等不可控因素对测量结果的影响,有效提高了测量精度。同时详细分析了环境温度以及光纤耦合器的横向应变对试验结果的影响。实验证明,熔融拉锥式单模光纤耦合器不但具有应力敏感性,而且随应变呈线性单调变化,同时也具有较好的温度稳定性和横向抗干扰性。

According to the sensitive characteristic of the ratio of single-mode fiber-optic coupler＇s output power to the length variety of coupling zone, the coupling-mode mechanism of fused biconical taper is conceived and described in detail. Researching the characteristic of the fiber-optic coupler using spiral micrometer to avoid the disturbance of cantilever self-weight and self-vibration, the measurement precision was enhance effectively. The influence of environment temperature and transverse strain to the experimented result was analysed simultaneously. The result indicates that the fused biconical taper coupler is sensitive to the strain, and also was a strain function changed monotone and linear. At the same time it has good temperature stability and anti-transverse-disturbance.