1977, Fiber and Integrated Optics, Vol 1, Number 1
A numerical technique based on ray optics is presented that provides the impulse response of multimode optical fibers having arbitrary smooth index profiles ans arbitrary material disposition. The variation of dn/d… o as a function of n when the dopant concentration varies is obtained from Fleming measurements on bulk samples. This technique is applied to germania-doped multimode fibers with power-law profiles and various vaues of ∆≥ 0.005. By successive approximations, optimum profiles that minimize the impulse response widths for quasi-mono-chromatic sources are found. For these optimum profiles, the quasi-monochromatic root-mean-square (rms) impulse response width is found to be of the order of 150 ∆2nsec/km, in agreement with a recent analytical result.
LIEN VERS L’ARTICLE : NUMERICAL EVALUATION OF THE IMPULSE RESPONSE OF MULTIMODE OPTICAL FIBERS