Method for manufacturing multimode optical fibers

A method of manufacturing a multimode optical fiber, comprising:

• drawing the multimode optical fiber from a preform at a draw tension T, the multimode optical fiber comprising a core and a cladding surrounding and directly adjacent to the core, the core having a radius r1 and a maximum relative refractive index Δ1,MAX>0, the cladding comprising a depressed-index region having a minimum relative refractive index Δ3,MIN<0 and a volume v, the multimode optical fiber having a peak wavelength λP at which the multimode optical fiber has a maximum bandwidth;
• comparing the peak wavelength λP to a selected target peak wavelength λP,target, wherein the selected target peak wavelength λP,target is within a tuning range between λ1 and λ2, the peak wavelength λP differing from the selected target peak wavelength λP,target by a difference magnitude ΔλP given by ΔλP=|λP−λP,target|;
• changing the draw tension T by an adjustment tension ΔT, the adjustment tension ΔT selected to vary the peak wavelength λP to reduce the difference magnitude ΔλP,
• wherein the selection of the adjustment tension ΔT is based on a correlation relating the adjustment tension ΔT to the difference magnitude ΔλP, the correlation comprising a correlation constant K, the correlation constant K being a function of at least one of Δ1,max, r1, v, Δ3,min, and λP,target;
• and
• adjusting the tuning range to adjust a difference between λ1 and λ2 by adjusting the correlation constant K through adjustments of a preform parameter and a draw process parameter;
• and
• drawing a subsequent multimode optical fiber from the preform at a second draw tension T, the second draw tension T being different than the draw tension T by the adjustment tension ΔT.

A method of manufacturing a multimode optical fiber, comprising:

• providing a preform;
• and
• drawing the multimode optical fiber from the preform, the multimode optical fiber including:
• a core having a core radius r1 in a range of from about 25 μm to about 27 μm,
• wherein the core is doped to define a peak relative refractive index Δ1,MAX>0;
• and
• a cladding surrounding and directly adjacent to the core, the cladding comprising a depressed-index region having a minimum relative refractive index Δ3,MIN<0 and a width w1, the width w1 being in a range of from about 4 μm to about 5 μm,
• wherein the peak wavelength λP is within a tuning range defined between λ1 and λ2, the tuning range and a difference between λ1 and λ2 being adjustable based on an adjustment of a fiber parameter including at least one of the peak relative refractive index Δ1,MAX, the core radius r1, the width w1 of the depressed-index region, and the minimum relative refractive index Δ3,MIN, the fiber parameter being adjustable based on an adjustment to a preform parameter and an adjustment to a draw process parameter.