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High-Quality Fiber Bragg Gratings Inscribed by Femtosecond Laser Point-by-Point Technology

Authors :
Runxiao Chen
Jun He
Xizhen Xu
Jiafeng Wu
Ying Wang
Yiping Wang
Source :
Micromachines, Vol 13, Iss 11, p 1808 (2022)
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

We experimentally studied the inscription of fiber Bragg gratings by using femtosecond (fs) laser point-by-point (PbP) technology. The effects of the focusing geometry, grating order, laser energy and grating length on the spectral characteristics of the PbP FBG were investigated. After optimizing these parameters, a high-quality first-order PbP FBG with a reflectivity > 99.9% (i.e., Bragg resonance attenuation of 37.7 dB) and insertion loss (IL) of 0.03 dB was successfully created. Moreover, taking advantage of the excellent flexibility of the fs laser PbP technology, high-quality FBGs with various Bragg wavelengths ranging from 856 to 1902.6 nm were inscribed. Furthermore, wavelength-division-multiplexed (WDM) FBG arrays consisting of 10 FBGs were rapidly constructed. Additionally, a Fabry-Perot cavity was realized by using two high-quality FBGs, and its birefringence could be reduced from 3.04 × 10−5 to 1.77 × 10−6 by using a slit beam shaping-assisted femtosecond laser PbP technology. Therefore, such high-quality FBGs are promising to improve the performance of optical fiber sensors, lasers and communication devices.

Details

Language :
English
ISSN :
2072666X
Volume :
13
Issue :
11
Database :
Directory of Open Access Journals
Journal :
Micromachines
Publication Type :
Academic Journal
Accession number :
edsdoj.b92aab095ba452abc800eb92afcc942
Document Type :
article
Full Text :
https://doi.org/10.3390/mi13111808