Macrobending loss of single-mode fibers is analyzed theoretically and measured experimentally in the paper.Simulations of macrobending loss for Corning SMF28single-mode optical fiber are conducted based on the formulas proposed by D.Marcuse

H.Renner and L.Faustini

respectively.The measurement and simulation results are compared.The results show that the simulation results based on D.Marcuse’s equation cannot predict the macrobending loss oscillation phenomenon

while the simulation results based on H.Renner’s can predict this phenomenon with largest relative error of 57.8% between simulation and experimental results.Meanwhile

the simulation results based on L.Faustini’s formula can predict this phenomenon with largest relative error of only 19.6%.Therefore

the equation presented by L.Faustini can be considered as an accurate formula to calculate macrobending loss of coated single-mode fibers.