Thank you Guilin Sun for your reply. What I have done so far is I found a Lumerical page https://optics.ansys.com/hc/en-us/articles/360043165394-Fibers-List-of-Examples that has fiber files to use and I downloaded the step index FDE file since technically my single mode fiber is a step index fiber. I attached my pics of my single mode fiber design and the calculations I used to design the geometry of the waveguide. The calculations for the radius of the core gave me a radius of .7659 um. I made the cladding radius 10 times the core radius so cladding radius is 7.659 um. The FDE I designed to have an x span and a y span of 38 um each. After calculating the modes I get two modes. I cannot seem to design to generate one mode only. I also included plots of my two modes. Can someone please let me know how I can tweak my design to get only one mode? Any advice is welcome.
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