Inscription of phase-shifted gratings with ultrashort pulses using defocusing and phase-mask shifting

Aviran Halstuch, Amiel A. Ishaaya

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Two slightly shifted wavelength gratings are inscribed one over the other in a single mode fiber by shifting the phase-mask between two positions. The inscription setup includes a NIR femtosecond laser, a phase-mask, a defocusing spherical lens and a cylindrical focusing lens. A first fiber Bragg grating (FBG) is inscribed, while the second overlapping FBG is inscribed only after a slight shift of the phase-mask, enabling a slight wavelength shift. The transmission spectrum of the complex structure is like that of a phase shifted grating, while the inscription process is very fast and simple compared to other standard methods. A high-quality phase shifted grating with two −20 dB transmission dips, a 15 dB transmission peak with a 30 pm transmission bandwidth at 3 dB is achieved. It is also observed that this phase shifted grating structure is birefringent.

Original languageEnglish
Title of host publicationMicro-structured and Specialty Optical Fibres VII
EditorsKyriacos Kalli, Alexis Mendez, Pavel Peterka
PublisherSPIE
ISBN (Electronic)9781510643802
DOIs
StatePublished - 1 Jan 2021
EventMicro-structured and Specialty Optical Fibres VII 2021 - Virtual, Online, Czech Republic
Duration: 19 Apr 202123 Apr 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11773
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceMicro-structured and Specialty Optical Fibres VII 2021
Country/TerritoryCzech Republic
CityVirtual, Online
Period19/04/2123/04/21

Keywords

  • Femtosecond inscription
  • Fiber Bragg gratings
  • Optical fibers
  • Phase shifted gratings

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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