Bending-insensitive, radiation-resistant single-mode optical fiber

A bending-insensitive, radiation-resistant single-mode optical fiber, sequentially comprising, from inside to outside,

• a core,
• inner claddings, and
• an outer cladding;
• wherein the core, the inner claddings and the outer cladding are all made from a quartz material;
• wherein
• the inner claddings comprise, from inside to outside,
• a first fluorine-doped inner cladding, and
• a second fluorine-doped inner cladding;
• the core and the first fluorine-doped inner cladding are not doped with germanium, and a first concentration of other metal impurities and a second concentration of phosphorus are less than 0.1 ppm:
• by mass percent, the core has a fluorine dopant content of 0-0.45% and a chlorine content of 0.01-0.10%;
• the first fluorine-doped inner cladding has a fluorine concentration of 1.00-1.55%;
• and the second fluorine-doped inner cladding has a fluorine concentration of 3.03-5.00%;
• wherein,
• a first maximum relative refractive index difference Δ1max between the core and the first fluorine-doped inner cladding is 0.28%, a second maximum relative refractive index difference Δ2max between the first fluorine-doped inner cladding and the second fluorine-doped inner cladding is 0.7%, and a third maximum relative refractive index difference Δ3max between the second fluorine-doped inner cladding and the outer cladding is −0.28%;
• or
• a first maximum relative refractive index difference Δ1max between the core and the first fluorine-doped inner cladding is 0.28%, a second maximum relative refractive index difference Δ2max between the first fluorine-doped inner cladding and the second fluorine-doped inner cladding is 0.4%, and a third maximum relative refractive index difference Δ3max between the second fluorine-doped inner cladding and the outer cladding is −0.28%;
• or
• a first maximum relative refractive index difference Δ1max between the core and the first fluorine-doped inner cladding is 0.28%, a second maximum relative refractive index difference Δ2max between the first fluorine-doped inner cladding and the second fluorine-doped inner cladding is 0.5%, and a third maximum relative refractive index difference Δ3max between the second fluorine-doped inner cladding and the outer cladding is −0.28%;
• or
• a first maximum relative refractive index difference Δ1max between the core and the first fluorine-doped inner cladding is 0.28%, a second maximum relative refractive index difference Δ2max between the first fluorine-doped inner cladding and the second fluorine-doped inner cladding is 0.5%, and a third maximum relative refractive index difference Δ3max between the second fluorine-doped inner cladding and the outer cladding is −0.78%;
• or
• a first maximum relative refractive index difference Δ1max between the core and the first fluorine-doped inner cladding is 0.133%, a second maximum relative refractive index difference Δ2max between the first fluorine-doped inner cladding and the second fluorine-doped inner cladding is 0.96%, a the third maximum relative refractive index difference Δ3max between the second fluorine-doped inner cladding and the outer cladding is −1.093%.