D. Israel et R. Baets, DISCUSSION OF THE SOLID ANGLE APERTURE IN RECTANGULAR MULTIMODE STEP-INDEX WAVE-GUIDES, Optical engineering, 36(1), 1997, pp. 273-275
The solid angle aperture of highly multimode rectangular step-index wa
veguides is calculated with mode theory and geometrical optics. There
is a difference between the results of the two different approaches, t
he geometrical optics aperture is larger and includes the aperture obt
ained from mode theory. A possible cause for this discrepancy is discu
ssed. (C) 1997 Society of Photo-Optical Instrumentation Engineers.