Open AccessLow-crosstalk orbital angular momentum fiber coupler design
Author(s) -
Zhishen Zhang,
Jiulin Gan,
Xiaobo Heng,
Muqiao Li,
Jiong Li,
Shanhui Xu,
Zhongmin Yang
Publication year - 2017
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.25.011200
Subject(s) - optics , angular momentum , crosstalk , microfiber , wavelength , physics , beam splitter , materials science , laser , quantum mechanics , composite material
A fiber coupler for low-crosstalk orbital angular momentum mode beam splitter is proposed with the structure of two separate and parallel microfibers. By properly setting the center-to-center distance between microfibers, the crosstalk is less than -20 dB, which means that the purity of the needed OAM mode in output port is higher than 99%. For a fixed overlapping length, high coupling efficiency (>97%) is achieved in 1545-1560 nm. The operating wavelength is tuned to the whole C-band by using the thermosensitive liquid. So the designed coupler can achieve the tunable coupling ratio over the whole C-band, which is a prospective component for the further OAM fiber system.