Wavelength Tunable OAM Mode Converters Based on Chiral Long-Period Gratings

We have demonstrated direct generation of high-order orbital angular momentum (OAM) modes by chiral long-period gratings (CLPGs) written in a few mode fiber (FMF) via a CO 2 laser. The high-order core modes (LP 11 , LP 21 , and LP 31 modes) were realized by the CLPGs through high order diffraction m...

Full description

Saved in:
Bibliographic Details
Published in:IEEE photonics technology letters 2020-12, Vol.32 (24), p.1519-1522
Main Authors: Zhao, Xinyi, Liu, Yunqi, Liu, Zuyao, Mou, Chengbo, Shen, Lei, Zhang, Lei, Luo, Jie
Format: Article
Language:English
Subjects:
Angular momentum
Carbon dioxide
Carbon dioxide lasers
Chiral long-period gratings
Communications systems
Converters
Diffraction
few-mode fiber
Fiber gratings
Gratings
high-order modes
mode conversion
Optical communication
Optical fiber communication
orbital angular momentum
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We have demonstrated direct generation of high-order orbital angular momentum (OAM) modes by chiral long-period gratings (CLPGs) written in a few mode fiber (FMF) via a CO 2 laser. The high-order core modes (LP 11 , LP 21 , and LP 31 modes) were realized by the CLPGs through high order diffraction modes with efficiencies of more than 99.69%. The -1 st , −2 nd , and −3 rd order OAM modes can be generated directly by the CLPGs with various grating periods. The proposed method opens a new path to implement all fiber high-order OAM mode generation. The OAM mode converters can be adopted as wavelength tunable mode converters by adjusting twist rate of the CLPGs, which could be widely used in optical communication and fiber sensing system based on FMFs.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2020.3038284