Single mode cutoff diameter calculated using both the WGA approximation and numerical calculations for a green light (637 nm) observed in nitrogen vacancy photoluminescence
 and near infrared light (780 nm) used in aqueous biosensing
, as well as the dispersionless and low attenuation telecom wavelengths of 1310 nm and 1550 nm. All calculations are performed for both air-clad (ncl = 1.0) and water-clad (ncl = 1.33) environments. The appropriate number of digits are retained to show the difference in WGA and numerical calculations.