Abstract
We propose a photonic crystal fiber with a high refractive index ring, which supports up to 180 orbital angular momentum (OAM) modes without any high order radial modes from
$1.5\ {\boldsymbol{um}}$
to
$1.7\ {\boldsymbol{um}}$
. The finite element method is employed to numerically study the properties of the designed fiber. Further research shows that the refractive index differences of all the eigenmodes are above
$2 \times {10^{ - 3}}$
, which indicates that the corresponding eigenmodes can be well-separated and ensures the stable transmission of OAM modes. In addition, it is quite interesting that the high order radial modes are significantly suppressed via increasing the radius of the cladding in the design, while most of the OAM modes are without phase distortion, which is beneficial for the (de)multiplexing of the OAM modes. Particularly, the mode quality of all the eigenmodes is higher than
$94.9\% $
and the chromatic dispersion is flat with minimum value of the dispersion variation is 0.36 ps/(km·nm). Moreover, the designed fiber possesses various advantages such as low nonlinear coefficient (
$ < 0.7\ /{{\bf W}}/{{\bf km}}$
) and confinement loss (on the order between
${10^{ - 12}}\ $
and
${10^{ - 7}}\ {\boldsymbol{dB}}/{\boldsymbol{m}}$
). The proposed fiber has shown great potential for high capacity OAM mode division multiplexing communications.
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription