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\section{Problem 2}  Part A\\  Using the modesolver now. Changed $n_{SiO2}=n_2=1.4456$ from problem 1. Kept m=3 just to show what modes arent guided for l=0. We know that when effective index vs wavelength falls below the index chosen for $n_{SiO2}$ that occurs for radiative modes and aren't guided. Figure 3 shows that $\lambda=850 nm,1550 nm$ are guided.