Fiber-guided modes conversion using superposed helical gratings

Optical fibers can support various modal forms, including vector modes, linear polarization (LP) modes, and orbital angular momentum (OAM) modes, etc. The modal correlation among these modes is investigated via Jones matrix, associated with polarization and helical phase corresponding to spin angula...

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Bibliographic Details
Published in:Optics communications 2017-03, Vol.386, p.1-5
Main Authors: Ma, Yancheng, Fang, Liang, Wu, Guoan
Format: Article
Language:English
Subjects:
Mode conversion
modesOrbital angular momentum
Superposed fiber gratings
Vector
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Summary:Optical fibers can support various modal forms, including vector modes, linear polarization (LP) modes, and orbital angular momentum (OAM) modes, etc. The modal correlation among these modes is investigated via Jones matrix, associated with polarization and helical phase corresponding to spin angular momentum (SAM) and OAM of light, respectively. We can generate different modal forms by adopting superposed helical gratings (SHGs) with opposite helix orientations. Detailed analysis and discussion on mode conversion is given as for mode coupling in optical fibers with both low and high contrast index, respectively. Our study may deepen the understanding for various fiber-guided modes and mode conversion among them via fiber gratings. •The mode correlation of fiber-guided modes is investigated by Jones matrix.•Different modes conversion is analyzed using superposed helical gratings (SHGs).•Non-degenerated modes can be generated using the SHGs inscribed in RCFs.•Degenerated modes can be generated using the SHGs inscribed in FMFs.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2016.11.007