A Photonic Crystal Fiber (PCF) is a special class of optical fibers which is made of a single material
and having air holes in the cladding. This paper studies and compares the optical characteristics such as
effective area, confinement loss and no
nlinearity, among three different PCF's structures: Hexagonal PCF (HPCF),
Octagonal PCF (O-PCF) and Decagonal PCF (D-PCF) with varied structural parameters (number of
the air-holes rings, the air-hole's diameter, and the lattice constant), and the target is to use the fiber in a
Raman amplifier. Proposed structures are simulated by using COMSOL MULTIPHYSICS which depends on
Finite Element Method (FEM).
The numerically simulated results shows that Decagonal PCF (D-PCF) offers lower confinement loss,
lower effective area, and larger value of nonlinearity than the other two structures. It is seen that Decagonal
PCF(D-PCF) is suitable for long transmission fiber applications.
