Abstract
By solving the time-dependent power flow equation, we present a novel approach for evaluating the bandwidth in a multimode step-index polymer photonic crystal fiber (SI PPCF) with a solid core. The bandwidth of such fiber is determined for various layouts of air holes and widths of Gaussian launch beam distribution. We found that the lower the NA of SI PPCF, the larger the bandwidth. The smaller launch beam leads to a higher bandwidth for short fibers. The influence of the width of the launch beam distribution on bandwidth lessens as the fiber length increases. The bandwidth tends to its launch independent value at a particular fiber length. This length denotes the onset of the steady state distribution (SSD). This information is useful for multimode SI PPCF applications in telecommunications and optical fiber sensing applications.
Highlights
Selective stacking and chemical doping of materials have historically been employed for fabrication of optical fibers with different refractive-index (RI) distributions
For multimode solid-core step-index polymer photonic crystal fiber (SI PPCF), the bandwidth was examined for varying widths of launch beam distribution
By numerically solving the time-dependent power flow equation, we proposed a novel approach for evaluating the bandwidth in a multimode SI PPCF with a solid core and triangular air-hole lattice in the cladding
Summary
Selective stacking and chemical doping of materials have historically been employed for fabrication of optical fibers with different refractive-index (RI) distributions. A variety of different micro-structured patterns of the PCF allows a broad versatility to modify its profile at the design stage [1,2,3,4,5,6,7]. With high NA PCFs, lensless beam focusing with the outstanding resolution has been recorded [31]
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