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US 7,421,172 B2Granted
Multimode optical fibre having a refractive index profile, optical communication system using same and method for manufacturing such a fibre
AssigneeDraka Comteq B.V.
InventorsPieter Matthijse, Mattheus Jacobus Nicolaas Stralen, Mark Peter Marie Jetten, Gert-Jan Krabshuis
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Abstract
The invention relates to a multimode optical fibre having a refractive index profile, comprising a light-guiding core surrounded by one or more cladding layers. The present invention furthermore relates to an optical communication system comprising a transmitter, a receiver and a multimode optical fibre.
Claims46
A multimode optical fibre having a refractive index profile, comprising:
- a gradient index light-guiding core including fluorine having a concentration increasing in a radial direction from a fibre axis (r=0);
- and
- one or more cladding layers surrounding the gradient index light-guiding core,
- wherein a transmission capacity is at least 1 Gbit/sec over a fibre length of at least 850 m, a wavelength band has a width of at least 250 nm in a wavelength range including 1400 nm, and the gradient index light-guiding core and the cladding layers constitute the multimode optical fibre.
1 more element
A multimode optical fibre having a refractive index profile, comprising:
- a gradient index light-guiding core including fluorine having a concentration increasing in a radial direction from a fibre axis (r=0);
- and
- one or more cladding layers surrounding the gradient index light-guiding core,
- wherein a transmission capacity of the multimode optical fibre is at least 1 Gbit/sec over a fibre length of at least 1300 m, a wavelength band has a width of at least 250 nm in a wavelength range including 1400 nm, and the gradient index light-guiding core and the cladding layers constitute the multimode optical fibre.
1 more element
A multimode optical fibre having a refractive index profile, comprising:
- a gradient index light-guiding core including fluorine having a concentration that increases in a radial direction from a fibre axis (r=0) to its maximum value at a radial position (rmax ) between the fibre axis (r=0) and the outer perimeter of the optical core (r=a);
- and
- one or more cladding layers surrounding the gradient index light-guiding core;
- wherein the multimode optical fibre has a core diameter of about 62.5 μm;
- wherein the multimode optical fibre has a minimum OFL bandwidth of at least about 160 Mhz.km at 850 nm and a minimum OFL bandwidth of at least about 300 Mhz.km at 1300 nm;
- wherein, over a fibre length of at least 850 meters, the multimode optical fibre has a transmission capacity of at least 1 Gbit/sec over a wavelength band (i) having a width of at least 250 nm and (ii) including a wavelength of 1400 nm;
- and
- wherein the gradient index light-guiding core and the one or more cladding layers constitute the multimode optical fibre.
5 more elements
A multimode optical fibre having a refractive index profile, comprising:
- a gradient index light-guiding core comprising fluorine and germanium dioxide, wherein the fluorine concentration within the gradient index light-guiding core (i) increases in a radial direction from the fibre axis (r=0) to its maximum value at a radial position (rmax) between the fibre axis (r=0) and the outer perimeter of the optical core (r=a) and (ii) decreases in a radial direction from rmax to the outer perimeter of the optical core (r=a);
- and
- one or more cladding layers surrounding the gradient index light-guiding core;
- wherein the multimode optical fibre has a core diameter of about 62.5 μm;
- wherein the multimode optical fibre has a minimum OFL bandwidth of at least about 160 Mhz.km at 850 nm and a minimum OFL bandwidth of at least about 300 Mhz.km at 1300 nm;
- wherein, over a fibre length of at least 850 meters, the multimode optical fibre has a transmission capacity of at least 1 Gbit/sec over a wavelength band (i) having a width of at least 250 nm and (ii) including a wavelength of 1400 nm;
- and
- wherein the gradient index light-guiding core and the one or more cladding layers constitute the multimode optical fibre.
5 more elements
A multimode optical fibre having a refractive index profile, comprising:
- a gradient index light-guiding core comprising fluorine and at least one additional refractive-index-changing dopant, wherein the fluorine concentration within the gradient index light-guiding core (i) increases in a radial direction from the fibre axis (r=0) to its maximum value at a radial position (rmax) between the fibre axis (r=0) and the outer perimeter of the optical core (r=a) and (ii) decreases in a radial direction from rmax to the outer perimeter of the optical core (r=a);
- and
- one or more cladding layers surrounding the gradient index light-guiding core;
- wherein the multimode optical fibre has a core diameter of about 50 μm;
- wherein the multimode optical fibre has a minimum OFL bandwidth of at least about 400 Mhz.km at both 850 nm and 1300 nm;
- wherein, over a fibre length of at least 1300 meters, the multimode optical fibre has a transmission capacity of at least 1 Gbit/sec over a wavelength band (i) having a width of at least 250 nm and (ii) including a wavelength of 1400 nm;
- and
- wherein the gradient index light-guiding core and the one or more cladding layers constitute the multimode optical fibre.
5 more elements
Dependencies are inferred from the claim text.