Multi-clad optical fibers
OwnerSaurabh Kapoor, Ranjith Balakrishnan +1inventors
InventorsSaurabh Kapoor, Ranjith Balakrishnan, Anand Pandey
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Abstract
The present invention relates to an optical fiber (100, 200, 300, 400) comprising one or more cores (102), a clad enveloping the one or more cores and a buffer clad layer (202, 302, 402) between the first clad layer and the second clad layer. Particularly, the clad includes a first clad layer (104) is made of silica with less than 0.1% metallic impurity and a second clad layer (106) is made of silica with greater than 0.1% of metallic impurity. Further, the first clad layer has less than 800 ppm OH content, less than 10 ppm aluminium and less than 2 ppm sodium and the second clad layer has less than 50 ppm OH content, more than 10 ppm aluminium and more than 2 ppm sodium.
Claims12
An optical fiber (100, 200, 300, 400) comprising:
- one or more cores (102), wherein the one or more cores (102) are made of germanium doped silica;
- and
- a clad enveloping the one or more cores (102), wherein the clad comprising at least two clad layers (104, 106), wherein a first clad layer (104) of the at least two clad layers (104, 106) is made of silica with less than 0.1% metallic impurity by mass, and a second clad layer (106) of the at least two clad layers (104,106) is made of silica with greater than 0.1% metallic impurity by mass,
- wherein the second clad layer (106) surrounds the first clad layer (104),
- wherein the first clad layer (104) is composed of type 3 silica or type 4 silica, and the second clad layer (106) is composed of type 1 silica or type 2 silica wherein a buffer clad layer composed of pure silica is present between the first clad layer (104) and the second clad layer (106) such that the first clad layer (104) has a radius between 10 to 20 microns, aluminum less than 10 ppm, and sodium less than 2 ppm.
Dependencies are inferred from the claim text.