Abstract

A novel temperature-insensitive optical curvature sensor has been proposed and demonstrated. The sensor is fabricated by inscribing fiber Bragg gratings with short lengths into a piece of strongly coupled multicore fiber (SCMCF) and spliced to the conventional single-mode fiber. Due to the two supermodes being supported by the SCMCF, two resonance peaks, along with a deep notch between them, were observed in the reflection spectrum. The experimental results show that the depth of the notch changes with the curvature with a sensitivity up to $15.9\;{\rm dB}/{{\rm m}^{- 1}}$ in a lower curvature range. Besides, thanks to the unique property of the proposed sensor, the notch depth barely changes with temperature. Based on the intensity demodulation of the notch depth, the temperature-insensitive curvature sensor is achieved with the cross sensitivity between the temperature, and the curvature is as low as $0.001\;{{\rm m}^{- 1}}/^\circ {\rm C}$.

© 2021 Optical Society of America

Full Article  |  PDF Article
More Like This
Multicore fiber-Bragg-grating-based directional curvature sensor interrogated by a broadband source with a sinusoidal spectrum

Di Zheng, Javier Madrigal, Hailan Chen, David Barrera, and Salvador Sales
Opt. Lett. 42(18) 3710-3713 (2017)

Long-range multicore optical fiber displacement sensor

Monserrat C. Alonso-Murias, David Monzón-Hernández, Osvaldo Rodríguez-Quiroz, J. Enrique Antonio-Lopez, Axel Schülzgen, Rodrigo Amezcua-Correa, and Joel Villatoro
Opt. Lett. 46(9) 2224-2227 (2021)

Temperature- and strain-insensitive curvature sensor based on ring-core modes in dual-concentric-core fiber

Zhifang Wu, Perry Ping Shum, Xuguang Shao, Hailiang Zhang, Nan Zhang, Tianye Huang, Georges Humbert, Jean-Louis Auguste, Frédéric Gérome, Jean-Marc Blondy, and Xuan Quyen Dinh
Opt. Lett. 41(2) 380-383 (2016)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (8)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (5)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription