Femtosecond inscription of a spectral array of four fiber Bragg gratings at the same spot, using a single uniform phase-mask

A. Halstuch; A. A. Ishaaya

doi:10.1117/12.2665095

30 May 2023 Femtosecond inscription of a spectral array of four fiber Bragg gratings at the same spot, using a single uniform phase-mask

A. Halstuch, A. A. Ishaaya

Author Affiliations +

Proceedings Volume 12573, Specialty Optical Fibres; 1257305 (2023) https://doi.org/10.1117/12.2665095
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

An array of four fiber Bragg gratings (FBGs) is inscribed at the same spot with a single uniform phase-mask (PM). The inscription setup consists of an 800 nm femtosecond laser, a PM, a defocusing spherical lens and a cylindrical focusing lens. The wavelength tunability of the center Bragg wavelength is achieved by a defocusing lens, and by PM translation. An FBG is inscribed, followed by three cascaded FBGs, which are inscribed exactly at the same spot, only after a movement of the PM. The second order Bragg grating array at ~1.55 µm transmission spectra of these four FBGs is measured, showing a spectral shift of ~1.8 nm between each one, and a total spectral shift of ~5.4 nm. The transmission dip of each FBG is approximately −6 dB. The third order Bragg grating array at ~1.04 µm transmission spectra shows a transmission dip of approximately −3 dB, a wavelength separation of ~1.2 nm between each one, and a total wavelength shift of ~3.6 nm.

Citation Download Citation

A. Halstuch and A. A. Ishaaya "Femtosecond inscription of a spectral array of four fiber Bragg gratings at the same spot, using a single uniform phase-mask", Proc. SPIE 12573, Specialty Optical Fibres, 1257305 (30 May 2023); https://doi.org/10.1117/12.2665095

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