Femtosecond inscription of phase-shifted fiber Bragg gratings using defocusing and phase-mask movement

被引：5

作者：

Halstuch, A. ^{[1
]}

Ishaaya, A. A. ^{[1
]}

机构：

[1] Ben Gurion Univ Negev, Sch Elect & Comp Engn, POB 653, IL-8410501 Beer Sheva, Israel

来源：

OPTICAL FIBER TECHNOLOGY | 2021年 / 67卷

关键词：

Femtosecond inscription; Fiber Bragg gratings; Phase shifted gratings; Optical fibers; PHOTO-TREATMENT; LASER; WAVELENGTH; WRITTEN; GENERATION;

D O I：

10.1016/j.yofte.2021.102689

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Two slightly shifted wavelength Bragg gratings are inscribed one over the other in a single mode fiber, by moving the phase-mask (PM) between two positions. The inscription setup includes a NIR femtosecond laser, a PM, 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 movement of the PM, enabling a slight wavelength shift. The transmission spectrum of the complex structure is like that of a phase-shifted fiber Bragg grating (PSFBG), while the inscription process is very fast and simple compared to other standard methods. A high-quality PSFBG with two -22 dB transmission dips, and a central 16 dB transmission peak with a 30 pm transmission bandwidth at 3 dB is achieved. It is also observed that this PSFBG structure is birefringent. Finally, the temperature and strain sensitivities of the PSFBG are experimentally measured and are 10.8 pm/degrees C and 0.8 pm/mu e, respectively.

引用

页数：7

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