I am simulating an Octagonal Photonic Crystal Fiber by Comsol. It is desired to extract some properties such as Dispersion, Confinement Loss and Effective Area vs. wavelength. For this purpose, I should obtain the Effective Refractive Index and Field Distribution for the Fundamental Mode. The Structure is a Solid-Core PCF (silica core n=1.45 and air holes n=1).
How I can reach to the Fundamental Mode?
First, plot the index profile of the PCF. Second, give the parameters of the simulation as wavelength, mesh, effective index's condition. Third, you can find the fundamental mode. View all calculated modes you will find the fundamental mode.
Normally, fundamental mode has the highest group velocity, meaning the lowest n_eff. I recommend chapter 09 of the book below which is made available online by the authors.
http://ab-initio.mit.edu/book/photonic-crystals-book.pdf
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