基于对称双芯光纤耦合器的集成式应力传感器

novel integrated fiber-optic strain sensor based on a symmetrical twin-core optical fiber was proposed and demonstrated as a strain sensor. The working principle of this sensor was theoretical analysis in detail. By heating and tapering a symmetrical twin-core fiber, the light from one core of the twin-core fiber can be partly or completely coupled into the other core in the coupled zone as the fiber was pulling. By detecting the output power of any one core of the twin-core fiber, the strain applied on the fiber can be determined. The output power of two cores were experimental measured, the results show that the twin-core fiber coupler can be used for strain sensor.