Abstract

Fiber Bragg gratings (FBGs) are used more and more in sensor applications for measuring e.g. strain or temperature. A key element are sensor arrays, consisting of multiple FBGs with different grating periods. Usually, such sensors are fabricated with well-established UV-laser inscription techniques, which however are limited to photosensitive fibers and offer relatively low temperature stabilities. These drawbacks can be overcome by using ultrashort laser pulses. The inscription process is not limited to photosensitive materials and the femtosecond inscribed FBGs offer higher temperature stabilities [1]. However, reliable inscription techniques with flexible period tuning are required for the realization of sensor arrays. An option is the point-by-point technique, where the easily adjustable translation speed of the fiber during the inscription process defines the grating period. But point-by-point gratings suffer from unwanted cladding modes and high scattering losses [2], which are unsuitable for sensor applications. An alternative is the phase mask technique, where the refractive index modulation is generated by an interference pattern from an overlap of the ±1st diffraction order underneath the mask (see Figure 1(a)) [3]. The period of the resulting grating is defined by the period of the phase mask. Therefore, this technique has a high period stability, however, offering no option of tuning the grating period.

© 2015 IEEE

PDF Article
More Like This
Wavelength tuning of through-coating-written fiber Bragg gratings

Thorsten A. Goebel, Christian Voigtländer, Ria G. Krämer, Christian Matzdorf, Maximilian Heck, Daniel Richter, Andreas Tünnermann, and Stefan Nolte
CM_4_5 The European Conference on Lasers and Electro-Optics (CLEO_Europe) 2017

Femtosecond Laser Written Fibre Bragg Gratings with Arbitrary Reflection and Dispersion Profiles

S. Antipov, M. Ams, R. Williams, A. Fuerbach, and M. Withford
CM_4_3 The European Conference on Lasers and Electro-Optics (CLEO_Europe) 2015

Femtosecond written phase-shifted-gratings and fiber Bragg gratings arrays using defocusing and phase-mask movement

Aviran Halstuch and Amiel. A. Ishaaya
cm_5_5 The European Conference on Lasers and Electro-Optics (CLEO_Europe) 2021

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