Circular Photonic Crystal Fibers: Numerical Analysis of Chromatic Dispersion and Losses

Abstract

Detailed numerical analysis for dispersion properties and losses has been carried out for a new type of Photonic crystal fiber where the air-holes are arranged in a circular pattern with a silica matrix called as Circular Photonic Crystal Fiber (C-PCF). The dependence of different PCF geometrical parameters namely different circular spacings, air-hole diameter and numbers of air-hole rings are carried out in detail towards practical applications. Our numerical analysis establishes that total dispersion is strongly affected by the interplay between material dispersion and waveguide dispersion. For smaller air-filing fraction, adding extra airhole rings does not change dispersion much whereas for higher air-filling fraction, the dispersion nature changes significantly. With proper adjustment of the parameters ultra-flattened dispersion could be achieved; though the application can be limited by higher losses. However, the ultra-flat dispersion fibers can be used for practical high power applications like supercontinuum generation (SCG) by reducing the loss at the pumping wavelength by increasing the no of air-hole rings. Broadband smooth SCG can also be achieved with low loss oscillating near-zero dispersion fiber with higher no of air-hole rings. The detail study shows that for realistic dispersion engineering we need to be careful for both loss and dispersion.

Management of residual dispersion of an optical transmission system using octagonal photonic crystal fiber

“…4, showing chromatic dispersion and wavelengths along Y and X axes, respectively. 21 The results of simulation confirm that the proposed O-PM-RDCF design has a higher amplitude of negative flattened dispersion than those of all previously reported designs in Refs. 4 due to very lower NFD T than the proposed O-PM-RDCF design.…”

A new photonic crystal fiber design on the high negative ultra-flattened dispersion for both X and Y polarization modes

“…Generally, a true residual dispersion compensating fiber (RDCF) should have ultraflattened negative chromatic dispersion (UNCD) for all wavelengths within a band for both X and Y polarized modes. In Fig.4 [4]. An oscillation comes between the characteristics of dispersion depending on the value of the parameters and when the bandwidth of the particular characteristics of dispersion is significantly wide [4,13].…”

“…In Fig.4 [4]. An oscillation comes between the characteristics of dispersion depending on the value of the parameters and when the bandwidth of the particular characteristics of dispersion is significantly wide [4,13]. Compared to other previous designs [6][7][8][9][10][11][12][13], only the proposed RDCF design performs negative ultra-flattened dispersion with the variation of only 4 and 5 ps/nm/km for the fundamental (Y and X) polarized modes.…”

“…Properly engineering the position, dimension and number of air holes, PCFs grant some attractive properties like ultraflattened chromatic dispersion, very high nonlinearity, lofty sloping negative dispersion, slight confinement loss (LC), small and huge effective mode area (Aeff), meager bending loss and high birefringence (B) [2][3][4]. The property of negative flattened dispersion (being used for residual dispersion compensation), is one of the most remarkable characteristics [5][6][7][8][9][10][11][12][13].…”

Design of nonlinear photonic crystal fibers with ultra‐flattened zero dispersion for supercontinuum generation

“…Researchers investigated several PCF structures based on the geometry of its core. Extant studies investigated PCF structure with dual core , rectangular core , square core , circular core , Octagonal core , T‐shaped core , and P‐shaped core . Even a quad‐core PCF structure was recently examined .…”