| 摘要 |
Control circuits (37) and (38) are programmed to produce dopant concentration profiles in the preform which will yield concentration profiles in the waveguide. An optical waveguide comprising P glass forming compounds where P<=3 and having a core with a radially-graded composition profile and 3 cladding, said concentration profile Cj(r) of the glass forming compounds varying substantially as: Cj(r)=Cj(o)+∑(i=1 to N)Cji(r/a)αi j-1...P, i=1...N, N>=2 where the coefficients Cji and αi produce reduced pulse dispersion, and where Cj(o) denote the concentrations at the radius r=o.
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