RT Journal Article ID 6227ce5203d0b4b5 A1 Bourdine, Anton A1 Delmukhametov, O. P. T1 CALCULATION OF TRANSMISSION PARAMETERS OF THE LAUNCHED HIGHER-ORDER MODES BASED ON THE COMBINATION OF A MODIFIED GAUSSIAN APPROXIMATION AND A FINITE ELEMENT METHOD JF Telecommunications and Radio Engineering JO TRE YR 2013 FD 2013-03-11 VO 72 IS 2 SP 111 OP 123 K1 multimode optical fibers K1 higher mode K1 propagation constant K1 Gaussian approximation K1 finite element method AB A method for calculating the transmission parameters of random-order launched modes, propagating in telecommunication quartz multimode optical fibers with a random gradient profile of the refractive index, bounded by one external solid cladding, is presented. The solution is based on the use of the modified Gaussian approximation, generalized to the above case, in combination with the mixed finite element method, adapted for analysis of multimode fiber waveguides. PB Begell House LK https://www.dl.begellhouse.com/journals/0632a9d54950b268,550426d65e22a564,6227ce5203d0b4b5.html