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

Aviran Halstuch; Amiel A. Ishaaya

doi:10.1117/12.2591765

18 April 2021 Inscription of phase-shifted gratings with ultrashort pulses using defocusing and phase-mask shifting

Aviran Halstuch, Amiel A. Ishaaya

Proceedings Volume 11773, Micro-structured and Specialty Optical Fibres VII; 117730S (2021) https://doi.org/10.1117/12.2591765
Event: SPIE Optics + Optoelectronics, 2021, Online Only

Abstract

Two slightly shifted wavelength gratings are inscribed one over the other in a single mode fiber by shifting the phasemask 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.

Conference Presentation

Citation Download Citation

Aviran Halstuch and Amiel A. Ishaaya "Inscription of phase-shifted gratings with ultrashort pulses using defocusing and phase-mask shifting", Proc. SPIE 11773, Micro-structured and Specialty Optical Fibres VII, 117730S (18 April 2021); https://doi.org/10.1117/12.2591765

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