Strain-assisted femtosecond inscription of phase-shifted gratings

Aviran Halstuch, Amiel A. Ishaaya

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Two slightly shifted gratings are inscribed, one over the other, while exploiting fiber strain in a single-mode fiber. The inscription is done with a near-infrared femtosecond laser, a phase mask, and a cylindrical focusing lens. The first fiber Bragg grating (FBG) is inscribed under normal fiber tension, while the second overlapping FBG is inscribed under higher fiber tension. The transmission spectrum of the complex structure is similar to that of a phase-shifted grating, yet the fabrication process is much faster and simpler compared to other standard methods. A high-quality phase-shifted grating with two −30 dB transmission dips, a 25 dB transmission peak, and <50 pm transmission bandwidth is achieved. We observe polarization-dependent transmission in the phase-shifted gratings.

Original languageEnglish
Pages (from-to)3893-3896
Number of pages4
JournalOptics Letters
Volume43
Issue number16
DOIs
StatePublished - 15 Aug 2018

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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