Open AccessOrbital angular momentum (OAM) spectrum correction in free space optical communication
Author(s) -
Yidong Liu,
Chunqing Gao,
Xiaoqing Qi,
Horst Weber
Publication year - 2008
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.007091
Subject(s) - optics , angular momentum , physics , light beam , orbital angular momentum of light , free space optical communication , beam (structure) , optical communication , optical vortex , angular momentum of light , laser beams , deflection (physics) , orbital angular momentum multiplexing , total angular momentum quantum number , laser , angular momentum coupling , classical mechanics
Orbital angular momentum (OAM) of laser beams has potential application in free space optical communication, but it is sensitive against pointing instabilities of the beam, i.e. shift (lateral displacement) and tilt (deflection of the beam). This work proposes a method to correct the distorted OAM spectrum by using the mean square value of the orbital angular momentum as an indicator. Qualitative analysis is given, and the numerical simulation is carried out for demonstration. The results show that the mean square value can be used to determine the beam axis of the superimposed helical beams. The initial OAM spectrum can be recovered.