lam0 1.55[um] Wavelength
f0 c_const/lam0 Frequency
n_taper 200 "Taper length in vacuum wavelengths"
d_taper n_taper*lam0 "Taper length"
w_core_1 lam0*2 "Input core width"
w_clad_1 100*lam0 "Input cladding width"
w_core_2 lam0*0.2 "Output core width"
w_clad_2 w_clad_1 "Output cladding width"
n_clad 1.5 "Refractive index, cladding"
n_core 1.55 "Refractive index, core"