Then Elango

Thank you very much for the reply. 

L is 90, and U is 180 (they are called that because of the shape of the letters is similar to the angles. )

Yes, I have both FDE and FDTD, I want to see the loss and I would like to know how to calculate the dimensions of waveguide  for particulator wavelength of the light source and I my material is a polymer of particular fixed refractive index. I mean, what width and height to use for 1550 nm and what should be the bend radius,