Abstract

We demonstrate a strain sensor with very high sensitivity in the static and low frequency regime based on a fiber ring cavity that includes a π phase-shifted fiber Bragg grating. The grating acts as a partial reflector that couples the two counter-propagating cavity modes, generating a splitting of the resonant frequencies. The presence of a sharp transition within the π phase-shifted fiber Bragg grating’s spectral transmittance makes this frequency splitting extremely sensitive to length, temperature, and the refractive index of the fiber in the region where the grating is written. The splitting variations caused by small mechanical deformations of the grating are tracked in real time by interrogating a cavity resonance with a locked-carrier scanning-sideband technique. The measurable strain range and bandwidth are characterized, and a resolution of 320/Hz1/2 at 0 Hz is experimentally demonstrated, the highest achieved to date with a fiber Bragg grating sensor.

© 2014 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Investigation of fiber Bragg grating based mode-splitting resonant sensors

Carlo Edoardo Campanella, Lorenzo Mastronardi, Francesco De Leonardis, Pietro Malara, Gianluca Gagliardi, and Vittorio M. N. Passaro
Opt. Express 22(21) 25371-25384 (2014)

Ultra-high-resolution large-dynamic-range optical fiber static strain sensor using Pound–Drever–Hall technique

Qingwen Liu, Tomochika Tokunaga, and Zuyuan He
Opt. Lett. 36(20) 4044-4046 (2011)

Fiber strain sensor based on a π-phase-shifted Bragg grating and the Pound-Drever-Hall technique

D. Gatti, G. Galzerano, D. Janner, S. Longhi, and P. Laporta
Opt. Express 16(3) 1945-1950 (2008)

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 OSA member, or as an authorized user of your institution.

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

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 OSA member, or as an authorized user of your institution.

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

Figures (3)

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

Contact your librarian or system administrator
or
Login to access OSA 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 OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA 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 OSA member, or as an authorized user of your institution.

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