Abstract: A high-bandwidth bend-insensitive multimode fiber includes a core laver and a cladding including an inner cladding, a depressed cladding, and an outer cladding arranged sequentially from inside to outside. The core layer is a silicon dioxide glass layer co-doped with germanium, phosphorus (P), and fluorine (F) and has a refractive index profile in a shape of a parabola, a distribution index in a range of 2.0-2.3, a radius in a range of 23-27 ?m, and a maximum relative refractive index difference in a range of 0.9-1.2% at its center. A contribution amount of P at the center is in a range of 0.01-0.30%. A doping amount of F increases from the center to the edge of the core layer. A contribution amount of F at the center and edge of the core layer is in range of 0.0% to ?0.1%, and ?0.40% to ?0.20%, respectively.

Abstract: A low-dispersion single-mode optical fiber includes a core and a cladding covering the core. The core has a relative refractive index difference of 0.30-0.65% and a radius of 2.5-4.5 ?m. The cladding layer including first, second, third cladding layers and an outer cladding arranged sequentially from inside to outside. The first cladding layer covers the core, and has a relative refractive index difference of ?0.70% to ?0.30% and a radius of 4.5-7.5 ?m. The second cladding layer covers the first cladding layer, and has a relative refractive index difference of ?0.20% to 0.25% and a radius of 7.0-12.0 ?m. The third cladding layer covers the second cladding layer, and has a relative refractive index difference of ?0.60% to 0.00% and a radius of 10.0-20.0 ?m. The outer cladding covers the third cladding layer, and is a layer made of pure silicon dioxide glass.

Abstract: A low-dispersion single-mode optical fiber includes a core and claddings covering the core. The core has a relative refractive index difference of 0.30-0.65% and a radius of 2.5-4.5 ?m. The claddings include first, second, third cladding layers and an outer cladding arranged sequentially from inside to outside. The first cladding layer covers the core, and has a relative refractive index difference of ?0.70% to ?0.30% and a radius of 4.5-7.5 ?m. The second cladding layer covers the first cladding layer, and has a relative refractive index difference of ?0.20% to ?0.25% and a radius of 7.0-12.0 ?m. The third cladding layer covers the second cladding layer, and has a relative refractive index difference of ?0.60% to 0.00% and a radius of 10.0-20.0 ?m. The outer cladding covers the third cladding layer, and is a layer made of pure silicon dioxide glass.

Abstract: A high-bandwidth bend-insensitive multimode fiber includes a core laver and a cladding including an inner cladding, a depressed cladding, and an outer cladding arranged sequentially from inside to outside. The core layer is a silicon dioxide glass layer co-doped with germanium, phosphorus (P), and fluorine (F) and has a refractive index profile in a shape of a parabola, a distribution index in a range of 2.0-2.3, a radius in a range of 23-27 ?m, and a maximum relative refractive index difference in a range of 0.9-1.2% at its center. A contribution amount of P at the center is in a range of 0.01-0.30%. A doping amount of F increases from the center to the edge of the core layer. A contribution amount of F at the center and edge of the core layer is in range of 0.0% to ?0.1%, and ?0.40% to ?0.20%, respectively.

Abstract: A single-mode fiber with ultralow attenuation includes a core layer and cladding layers. The cladding layers includes an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary cladding layer. The core layer has a radius of 3.9-4.8 ?m and a relative refractive index difference of ?0.08% to 0.10%. The inner cladding layer has a radius of 9-14 ?m and a relative refractive index difference of ?0.40% to ?0.15%. The trench cladding layer has a radius of 13-25 ?m and a refractive index difference of ?0.7% to ?0.3%. The auxiliary outer cladding layer has a radius of 30-50 ?m and a relative refractive index difference of ?0.4% to ?0.15%. The outer cladding layer is a pure silicon dioxide glass layer.

Abstract: A high-bandwidth bend-insensitive multimode optical fiber includes a core and a cladding. A refractive index profile of the core has a parabola shape and a distribution index thereof is ?. The core has a radius of 23-27 ?m. A maximum relative refractive index difference of a central position of the core is 0.9%-1.2%. The core is a germanium-fluorine co-doped silicon dioxide glass layer. The central position of the core has a minimum amount of fluorine doped, and a mass percentage of fluorine content is CF,min. A mass percentage of fluorine content of the core changes with the radius according to a function. The cladding successively comprises an inner cladding, a trench cladding, and an outer cladding from inside to outside. The optical fiber reduces bandwidth-wavelength sensitivity while improving bandwidth performance; is compatible with existing OM3/OM4 multimode optical fibers, and support wavelength-division multiplexing technology in a wavelength range of 850-950 nm.

Abstract: An optical fiber with ultra-low attenuation and large effective-area includes a core layer and cladding layers. The cladding layers have an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary outer cladding layer. The core layer has a radius of 4.8-6.5 ?m, and a relative refractive index difference of ?0.06% to 0.10%. The inner cladding layer has a radius of 9-15 ?m, and a relative refractive index difference of about ?0.40% to ?0.15%. The trench cladding layer has a radius of about 12-17 ?m, and a relative refractive index difference of about ?0.8% to ?0.3%. The auxiliary outer cladding layer has a radius of about 37-50 ?m, and a relative refractive index difference of about ?0.6% to ?0.25%. The outer cladding layer is a pure silicon-dioxide glass layer.

Abstract: A high-bandwidth bend-insensitive multimode optical fiber includes a core and a cladding. A refractive index profile of the core has a parabola shape and a distribution index thereof is ?. The core has a radius of 23-27 ?m. A maximum relative refractive index difference of a central position of the core is 0.9%-1.2%. The core is a germanium-fluorine co-doped silicon dioxide glass layer. The central position of the core has a minimum amount of fluorine doped, and a mass percentage of fluorine content is CF,min. A mass percentage of fluorine content of the core changes with the radius according to a function. The cladding successively comprises an inner cladding, a trench cladding, and an outer cladding from inside to outside. The optical fiber reduces bandwidth-wavelength sensitivity while improving bandwidth performance; is compatible with existing OM3/OM4 multimode optical fibers, and support wavelength-division multiplexing technology in a wavelength range of 850-950 nm.

Abstract: An optical fiber with ultra-low attenuation and bend insensitivity includes a core layer and cladding layers. The cladding layers have an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary outer cladding layer. The core layer has a radius of 3.0-3.9 ?m, and a relative refractive index difference of ?0.04% to 0.12%. The inner cladding layer has a radius of 8-14 ?m, and a relative refractive index difference of about ?0.35% to ?0.10%. The trench cladding layer has a radius of about 14-20 ?m, and a relative refractive index difference of about ?0.6% to ?0.2%. The auxiliary outer cladding layer has a radius of about 35-50 ?m, and a relative refractive index difference of about ?0.4% to ?0.15%. The outer cladding layer is a pure silicon-dioxide glass layer.

Abstract: A doping optimized single-mode optical fiber with ultra low attenuation includes a core layer and cladding layers. The cladding layers has an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary outer cladding layer. The content of fluorine in the core layer is ?0.5 wt %, ?Ge?0.12%, ?n1?0.12%. The content of fluorine in the inner cladding layer is 0.5-1.5 wt %, ?n2??0.14%. The content of fluorine in the trench cladding layer is 1-3 wt %, ?n3??0.25%. The content of fluorine in the auxiliary outer cladding layer is 0.5-2 wt %, ?n4??0.14%. The outer cladding layer is a pure silicon dioxide glass layer and/or a metal-doped silicon dioxide glass layer.

Abstract: A bending-insensitive single-mode fiber with ultralow attenuation includes a core layer and cladding layers. The cladding layers includes an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary cladding layer. The core layer has a radius of 3.0 to 3.9 ?m and a relative refractive index of ?0.04% to 0.12%. The inner cladding layer has a radius of 8 to 14 ?m and a relative refractive index ?0.35% to ?0.10%. The trench cladding layer has a radius of 14 to 20 ?m and a relative refractive index of ?0.6% to ?0.2%. The auxiliary outer cladding layer has a radius of 35 to 50 ?m and a relative refractive index of ?0.4% to ?0.15%. The outer cladding layer is a pure silica glass layer.

Abstract: An optical fiber with ultra-low attenuation and bend insensitivity includes a core layer and cladding layers. The cladding layers have an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary outer cladding layer. The core layer has a radius of 3.0-3.9 ?m, and a relative refractive index difference of ?0.04% to 0.12%. The inner cladding layer has a radius of 8-14 ?m, and a relative refractive index difference of about ?0.35% to ?0.10%. The trench cladding layer has a radius of about 14-20 ?m, and a relative refractive index difference of about ?0.6% to ?0.2%. The auxiliary outer cladding layer has a radius of about 35-50 ?m, and a relative refractive index difference of about ?0.4% to ?0.15%. The outer cladding layer is a pure silicon-dioxide glass layer.

Abstract: An optical fiber with ultra-low attenuation and large effective-area includes a core layer and cladding layers. The cladding layers have an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary outer cladding layer. The core layer has a radius of 4.8-6.5 ?m, and a relative refractive index difference of ?0.06% to 0.10%. The inner cladding layer has a radius of 9-15 ?m, and a relative refractive index difference of about ?0.40% to ?0.15%. The trench cladding layer has a radius of about 12-17 ?m, and a relative refractive index difference of about ?0.8% to ?0.3%. The auxiliary outer cladding layer has a radius of about 37-50 ?m, and a relative refractive index difference of about ?0.6% to ?0.25%. The outer cladding layer is a pure silicon-dioxide glass layer.

Abstract: A doping optimized single-mode optical fiber with ultra low attenuation includes a core layer and cladding layers. The cladding layers has an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary outer cladding layer. The content of fluorine in the core layer is ?0.5 wt %, ?Ge?0.12%, ?n1?0.12%. The content of fluorine in the inner cladding layer is 0.5-1.5 wt %, ?n2??0.14%. The content of fluorine in the trench cladding layer is 1-3 wt %, ?n3??0.25%. The content of fluorine in the auxiliary outer cladding layer is 0.5-2 wt %, ?n4??0.14%. The outer cladding layer is a pure silicon dioxide glass layer and/or a metal-doped silicon dioxide glass layer.

Abstract: A bending-insensitive single-mode fiber with ultralow attenuation includes a core layer and cladding layers. The cladding layers includes an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary cladding layer. The core layer has a radius of 3.0 to 3.9 ?m and a relative refractive index of ?0.04% to 0.12%. The inner cladding layer has a radius of 8 to 14 ?m and a relative refractive index ?0.35% to ?0.10%. The trench cladding layer has a radius of 14 to 20 ?m and a relative refractive index of ?0.6% to ?0.2%. The auxiliary outer cladding layer has a radius of 35 to 50 ?m and a relative refractive index of ?0.4% to ?0.15%. The outer cladding layer is a pure silica glass layer.

Abstract: A single-mode fiber with ultralow attenuation includes a core layer and cladding layers. The cladding layers includes an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary cladding layer. The core layer has a radius of 3.9-4.8 ?m and a relative refractive index difference of ?0.08% to 0.10%. The inner cladding layer has a radius of 9-14 ?m and a relative refractive index difference of ?0.40% to ?0.15%. The trench cladding layer has a radius of 13-25 ?m and a refractive index difference of ?0.7% to ?0.3%. The auxiliary outer cladding layer has a radius of 30-50 ?m and a relative refractive index difference of ?0.4% to ?0.15%. The outer cladding layer is a pure silicon dioxide glass layer.

Abstract: A single-mode fiber with an ultra-low attenuation and a large effective area includes a core layer having a radius of 4.8 to 6.5 and a relative refractive index difference ?n1 of ?0.06% to 0.10%, and cladding layers. The cladding layers includes an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary cladding layer. The inner cladding layer has a radius of 9 to 15 ?m and a relative refractive index difference of ?0.40% to ?0.15%. The trench cladding layer has a radius of 12 to 17 ?m and a relative refractive index difference of ?0.8% to ?0.3%. The auxiliary outer cladding layer has a radius of 37 to 50 ?m and a relative refractive index difference of ?0.6% to ?0.25%. The outer cladding layer is a pure-silicon-dioxide glass layer.

Abstract: A single-mode fiber with an ultra-low attenuation and a large effective area includes a core layer having a radius of 4.8 to 6.5 and a relative refractive index difference ?n1 of ?0.06% to 0.10%, and cladding layers. The cladding layers includes an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary cladding layer. The inner cladding layer has a radius of 9 to 15 ?m and a relative refractive index difference of ?0.40% to ?0.15%. The trench cladding layer has a radius of 12 to 17 ?m and a relative refractive index difference of ?0.8% to ?0.3%. The auxiliary outer cladding layer has a radius of 37 to 50 ?m and a relative refractive index difference of ?0.6% to ?0.25%. The outer cladding layer is a pure-silicon-dioxide glass layer.

Abstract: A bend-insensitive multimode optical fiber includes a core layer, and cladding layers surrounding the core layer. The core layer has a parabolic refractive index profile with ? being 1.9-2.2, a radius being 23-27 ?m, and a maximum relative refractive index difference being between 0.9-1.2%. The inner cladding layer has a width being 1-3 ?m and a relative refractive index difference being between ?0.05% and 0.1%. The trench cladding layer has a width being 2-5 ?m and a relative refractive index difference being between ?1% and ?0.3%. The core layer is a Ge/F co-doped silica glass layer, where an F doping contribution at a central position of the core layer is less than or equal to 0%, an F doping contribution at an edge portion of the core layer is greater than or equal to ?0.45%. The outer cladding layer is a pure silica glass layer.

Abstract: A bend-insensitive multimode optical fiber includes a core layer, and cladding layers surrounding the core layer. The core layer has a parabolic refractive index profile with ? being 1.9-2.2, a radius being 23-27 ?m, and a maximum relative refractive index difference being between 0.9-1.2%. The inner cladding layer has a width being 1-3 ?m and a relative refractive index difference being between ?0.05% and 0.1%. The trench cladding layer has a width being 2-5 ?m and a relative refractive index difference being between ?1% and ?0.3%. The core layer is a Ge/F co-doped silica glass layer, where an F doping contribution at a central position of the core layer is less than or equal to 0%, an F doping contribution at an edge portion of the core layer is greater than or equal to ?0.45%. The outer cladding layer is a pure silica glass layer.