Broadband and stable linearly polarized mode converter based on polarization-maintaining fiber long-period grating

Chen Jiang, Yunqi Liu*, Ying Wan, Yanlv Lin, Chengbo Mou, Yuehui Ma, Kaiming Zhou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrate a broadband and stable linearly polarized mode converter by inscribing long-period grating (LPG) in few-mode polarization-maintaining fibers (FPMFs). The operating wavelength of the mode converter at 1.0- and 1.5- μm waveband has been achieved by using PMF with different cut-off wavelengths. Theoretical and experimental demonstrated broadband linearly polarized mode conversion can be achieved with a maximum 10 dB bandwidth of 140- and 189- nm at 1.0- and 1.5- μm waveband respectively due to the turning point coupling mechanism. Then, we propose and demonstrate a controllable linearly polarized orbital angular momentum (LP-OAM) mode generator using a single LPG-based mode converter and a length of FPMF. The LP-OAM mode is produced by turning axial strain and can be smoothly switched between ± 1 order. Our all-FPMF based grating fabrication offers a new option towards a stable and broadband polarized mode converter and LP-OAM mode generator for application in a few-mode fiber laser and communication system.

Original languageEnglish
Article number108159
JournalOptics and Laser Technology
Volume152
DOIs
Publication statusPublished - Aug 2022

Bibliographical note

Funding Information:
This work was supported by the National Natural Science Foundation of China ( 62075124 , 61875117 ) and the National Key Research and Development Program of China (2020YFB1805800). Chen Jiang also acknowledges the China Scholarship Council for financial support.

Keywords

  • Dispersion turning point
  • Long-period gratings
  • Mode converter
  • OAM mode generator
  • Polarization-maintaining fibers

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