Dual tapered optical fiber for simultaneous detection of curvature and strain

We present a study of simultaneous detection of curvature and strain in optical fiber. This contains a micro tapered section and a nano tapered section. The transmission spectrum shows interference of multiple modes, and the frequency of the modulation can be used to distinguish and monitor specific physical parts of the fiber structure. The curvature detection is achieved using one specific modulation frequency component; this component shows an intensity modulation with a sensitivity of 0.26 dB/m(-1). The strain information is extracted by applying a phase analysis over a second spatial frequency component; this analysis shows a sensitivity close to 8 mrad/mu epsilon. The strain phase analysis exhibits a linear response, and the intensity curvature data indicates an exponential model. The proposed signal analysis can be employed for simultaneous detection in optical fiber interferometric sensors.

Automated summary

This study presents a method for simultaneous detection of curvature and strain in optical fiber. By analyzing the interference spectrum, different physical parts of the fiber structure can be distinguished and monitored. Curvature detection is achieved using a specific modulation frequency, while strain information is extracted through phase analysis. This method can be used for simultaneous detection in optical fiber sensors.