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Cross-axis Bragg gratings in few-mode fibers inscribed with a femtosecond laser point-by-point technique.
- Source :
-
Optics Communications . Jun2023, Vol. 536, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- Point-by-point (PbP) cross-axis Bragg gratings in a step-index two-mode fiber are fabricated by tightly focused femtosecond laser pulses. The grating is formed by inscribing a line of periodic damage points crossing the fiber axis at a certain tilting angle. We experimentally show that the cross-axis structure can introduce multiple mainband resonances associated with the higher-order modes, with wavelength spacing proportional to the tilting angle. We also develop a numerical model for the PbP-inscribed gratings based on pulse-wave approximation and the standard coupled-mode theory, the resulting simulation exhibits a good agreement with the experimental findings. This work suggests the higher-order fiber modes, synergizing with the PbP technique, has the potential to add a new dimension to designing gratings with desired spectral spacing; such an inverse problem of PbP gratings can be assisted by the numerical modal we developed. • Multi-wavelength FBGs based on few-mode fibers and point-by-point inscription. • Multi-mainband resonances introduced by the cross-axis structure. • Demonstrated an extra dimension of FBG spectral tailoring leveraging HOMs. • Developed a numerical model for point-by-point FBGs with complex structures. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00304018
- Volume :
- 536
- Database :
- Academic Search Index
- Journal :
- Optics Communications
- Publication Type :
- Academic Journal
- Accession number :
- 162475615
- Full Text :
- https://doi.org/10.1016/j.optcom.2023.129379