Abstract: A few mode optical fiber comprising: a Ge-free core having an effective area Aeff of LP01 mode wherein 120 ?m2<Aeff<1000 ?m2 at 1550 nm, and a refractive index profile selected such that the core is capable of supporting the propagation and transmission of an optical signal with X number of LP modes at 1550 nm, X is an integer and 1<X?20, maximum refractive index delta of the core, ?0, wherein ?0.5%??0?0.08%; and, an annular cladding surrounding the core having a low index ring with a minimum refractive index delta ?rMIN, ?rMIN<?0 and ?rMIN??0.3 relative to pure SiO2, an outer cladding with a refractive index delta ?Outer-Clad, such that ?Outer-Clad>?rMIN; and |?0??Outer-Clad|>0.05%, the relative refractive index profile of the optical fiber is selected to provide attenuation of <0.18 dB/km at the 1550 nm, and LP11 cut off wavelength >1600 nm.

Abstract: An optical fiber with a glass core extending from a centerline to a radius R1 wherein R1 is greater than about 5 ?m; a glass cladding surrounding and in contact with the core. The cladding has a depressed annular region, the inner radius of said depressed annular region is spaced from said core a distance greater than 1 ?m and less or equal to than 5 ?m. The core and the cladding provide a fiber with cable cutoff less than 1550 nm, and an effective area at 1550 nm greater than 120 ?m2 and bend loss of ?0.7 dB/turn on a 20 mm diameter mandrel.

Abstract: An optical fiber having both low macrobend loss and low microbend loss. The fiber has a first inner cladding region having an outer radius r2>8 microns and refractive index ?2 and a second outer cladding region surrounding the inner cladding region having refractive index ?4, wherein ?1>?4>?2. The difference between ?4 and ?2 is greater than 0.002 percent. The fiber exhibits a 22 m cable cutoff less than or equal to 1260 nm, and r1/r2 is greater or equal to 0.25.

Abstract: A method of making a multimode optical fiber is disclosed. In one embodiment the method includes calculating a core radius that maximizes the bandwidth of the multimode optical fiber wherein the effect of draw tension is accounted for. The embodiments herein illustrate how core radius can be tuned so the time delay of the outermost guided mode group is reduced. The resultant core radius may be targeted for a value off-nominal from what would be expected for a particular commercial optical fiber type.

Abstract: An optical fiber includes a central glass core region comprising maximum refractive index delta percent ?1, a first inner annular region surrounding said core comprising refractive index delta percent ?2, a depressed annular region surrounding said inner annular region and comprising ?3 and a third annular region surrounding the depressed annular region comprising refractive index delta percent ?4; wherein the third annular region comprises chlorine an amount greater than 0.2 weight percent in a region which is within 5 microns from the depressed annular region, wherein ?1MAX>?4>?2>?3. The difference between ?4 and ?2 is greater than 0.01 and profile volume, |V3| is at least 50% ??m2.

Abstract: According to some embodiments an optical waveguide fiber comprises: (i) a Ge free core having an effective area of 90 ?m2 to 160 ?m2, at a 1550 nm wavelength, and ? value 12???25, said core comprising: (a) a central core region extending radially outwardly from a centerline to a radius 0 ?m?r0?2 ?m, and having a relative refractive index percent profile ?0(r) in % measured relative to pure silica, wherein ?0.1%??0(r)?0.1%, wherein the central core region has a maximum relative refractive index percent, ?0MAX; (b) a first annular core region surrounding and directly adjacent to the central core region and extending to an outer radius r1, wherein 4.8 ?m?r1?10 ?m, and having a relative refractive index percent profile, ?1(r) in % measured relative to pure silica, and a minimum relative refractive index, ?2MIN, and the relative refractive index measured at a radius r=2.5 ?m being: ?0.15??1(r=2.5 ?m)?0, and ?0MAX??1(r=2.

Abstract: An optical fiber includes a central glass core region comprising maximum refractive index delta percent ?1, a first inner annular region surrounding said core comprising refractive index delta percent ?2, a depressed annular region surrounding said inner annular region and comprising ?3 and a third annular region surrounding the depressed annular region comprising refractive index delta percent ?4; wherein ?1MAX>?4>?2>?3. The difference between ?4 and ?2 is greater than 0.01% and profile volume, |V3| is at least 10%-?m2. The fibers exhibit an effective area at 1550 nm which is greater than 110 ?m2.

Abstract: An optical fiber with a glass core extending from a centerline to a radius R1 wherein R1 is greater than about 5 ?m; a glass cladding surrounding and in contact with the core. The cladding has a depressed annular region, the inner radius of said depressed annular region is spaced from said core a distance greater than 1 ?m and less or equal to than 5 ?m. The core and the cladding provide a fiber with cable cutoff less than 1550 nm, and an effective area at 1550 nm greater than 120 ?m2 and bend loss of ?0.7 dB/turn on a 20 mm diameter mandrel.

Abstract: According to one embodiment, a method for characterizing a multimode, bend resistant optical fiber may include determining a core refractive index profile for a core portion of a preform and determining a moat refractive index profile for a moat portion of the preform. Thereafter, a property of a multimode optical fiber is determined prior to drawing the multimode optical fiber from the preform. The property of the multimode fiber is determined based on the core refractive index profile of the preform, the moat refractive index profile of the preform, the inner radius rin and the outer radius rout of a depressed-index annular portion of the multimode optical fiber and fiber property coefficients.

Abstract: According to some embodiments an optical waveguide fiber comprises (i) a Ge free core having an effective area of 100 ?m2to 150 ?m2, at 1550 nm wavelength, said core comprising: a) a central core region extending radially outwardly from a centerline to a radius r1, and having a relative refractive index percent profile ?1(r) in % measured relative to pure silica, wherein ?0.1%??1(r)?0.12%, wherein the central core region has a maximum relative refractive index percent, ?1MAX; (b) a first annular core region surrounding and directly adjacent to the central core region, having an ? value 1.5???10, and extending to an outer radius r2, wherein 6 ?m?r2?10 ?m, and having a relative refractive index percent profile, ?2(r) in % measured relative to pure silica, a minimum relative refractive index ?2MIN, a maximum relative refractive index ?2MAX and the relative refractive index measured at a radius r=2 ?m, wherein 0.45??2?0; ?0.25??2MIN??0.

Abstract: Optical waveguide fiber that is bend resistant and single mode at 1260 nm and at higher wavelengths. The optical fiber includes a core of radius R1 and cladding, the cladding having an annular inner region of radius R2, an annular ring region, and an annular outer region. The annular ring region starts at R2, and the ratio R1/R2 is greater than 0.40.

Abstract: An optical waveguide fiber is provided that includes a core and a cladding, where the core includes an alpha profile, wherein alpha (?) is greater than 2.5 and less than 3.0. The core and the cladding provide a fiber with an attenuation of less than 0.331 dB/km at a wavelength of 1310 nm, an attenuation of less than 0.328 dB/km at a wavelength of 1383 nm, an attenuation of less than 0.270 dB/km at a wavelength of 1410 nm, and an attenuation of less than 0.190 dB/km at a wavelength of 1550 nm. Methods for producing the optical fiber are also provided.

Abstract: A single mode optical fiber comprises: (i) a segmented core having at least three segments and (ii) a silica based clad layer surrounding and in contact with the core, the clad layer having a refractive index nc. The first segment has a ?max % in the range of about 0.75 to 1.1, and ?0%?0.6?max %, and an outer radius r1 in the range of about 1.5 to 3.0 ?m. The second segment has a ?2% in the range of 0.00 to 0.15%. The third segment has a ?3% in the range of less than 0.35%, an outer radius r3 in the range of about 7 ?m to 11 ?m, a width w3 in the range of about 1.5 to 3 ?m, and volume V3<7% ?m2. The refractive index profiles of the core segments are selected to provide: zero dispersion wavelength in the range of about 1565 nm to 1600 nm; total dispersion at 1550 nm in the range of about ?6 to ?0.5 ps/nm-km; and dispersion slope at 1550 nm is greater than 0.1.

Abstract: An optical fiber comprising: (i) a glass core (20) extending from a centerline and including a central core region (22) with an alpha value of less than 2, a first annular core region (24)surrounding the central core region (22), and a second annular core region (26) surrounding the first annular core region (24), wherein the second annular core region (26) has a higher maximum relative refractive index percent ?26MAX than that maximum relative refractive index percent ?24MAX of the first annular core region (24); and (ii) a glass cladding (30) surrounding and in contact with the core (20), the cladding comprising: (a) a first annular cladding region (32) extending from a radius RC3 to a radius R32, (b) a second annular cladding region (34) extending from the radius R32 to a radius R34, (c) a third annular cladding region (36) surrounding the second annular region (34) and extending from the radius R34 to an outermost glass radius R36; wherein the core (20) comprises a maximum relative refractive index percen

Abstract: Disclosed is an optical fiber having a silica-based core comprising an alkali metal oxide a silica-based core, said core comprising an alkali metal oxide selected from the group consisting of K2O, Na2O, Li2O, Rb2O, Cs2O and mixtures thereof in an average concentration in said core between about 10 and 10000 ppm by weight, and a silica-based cladding surrounding and directly adjacent the core, the cladding including a region having a lower index of refraction than the remainder of such cladding. By appropriately selecting the concentration of alkali metal oxide dopant in the core and the cladding, a low loss optical fiber may be obtained which exhibits a cable cutoff less than 1400 nm chromatic dispersion at 1550 nm between about 13 and 19 ps/nm/km, and a zero dispersion wavelength less than about 1324 nm.

Abstract: Microstructured optical fiber for transmitting optical signals comprised of light, the optical fiber including a core region and a cladding region surrounding the core region, the cladding region including at least one annular region having an index of refraction lower than that of the remainder of the cladding. The optical fiber provides an absolute SBS threshold in dBm greater than about 9.3+10log[(1?e?(0.19)(50)/4.343)/(1?e?(?)(L)/4.343)], wherein L is the length in km and ? is the attenuation in dB/km at 1550 nm, and a fiber cutoff wavelength of less than 1400 nm.

Abstract: According to some embodiments an optical waveguide fiber comprises: (i) a Ge free core having an effective area of 90 ?m2 to 160 ?m2, at a 1550 nm wavelength, and ? value 12???25, said core comprising: (a) a central core region extending radially outwardly from a centerline to a radius 0 ?m?r0?2 ?m, and having a relative refractive index percent profile ?0(r) in % measured relative to pure silica, wherein ?0.1%??0(r)?0.1%, wherein the central core region has a maximum relative refractive index percent, ?0MAX, (b) a first annular core region surrounding and directly adjacent to the central core region and extending to an outer radius r1, wherein 4.8 ?m?r1?10 ?m, and having a relative refractive index percent profile, ?1(r) in % measured relative to pure silica, and a minimum relative refractive index, ?2MIN, and the relative refractive index measured at a radius r=2.5 ?m being: ?0.15??1(r=2.5 ?m)?0, and ?0MAX??1(r=2.

Abstract: An optical waveguide fiber comprising: (i) a Ge free core having an effective area of 90 ?m2 to 160 ?m2, at a 1550 nm wavelength, and ? value 12???25, said core comprising: (a) a central core region extending radially outwardly from a centerline to a radius r0?2 ?m, and having a relative refractive index percent profile ?0(r) wherein ?0.1% ??0(r) ?0.1%, and wherein the central core region has a maximum relative refractive index, ?0MAX, (b) a first annular core region surrounding and directly adjacent to the central core region and extending to an outer radius r1, wherein 4.8 ?m ?r1?10 ?m, and having a relative refractive index percent profile, ?1(r), and a minimum relative refractive index, ?2MIN, and the relative refractive index measured at a radius r=2.5 ?m being ?0.15??1(r=2.5 ?m) ?0, and ?0MAX ??1(r=2.

Abstract: Optical waveguide fiber that is bend resistant and single mode at 1260 nm and at higher wavelengths. The optical fiber includes a core of radius R1 and cladding, the cladding having an annular inner region of radius R2, an annular ring region, and an annular outer region. The annular ring region starts at R2, and the ratio R1/R2 is greater than 0.40.

Abstract: A single mode optical fiber comprises: (i) a segmented core having at least three segments and (ii) a silica based clad layer surrounding and in contact with the core, the clad layer having a refractive index nc. The first segment has a ?max% in the range of about 0.75 to 1.1, and ?0%?0.6?max %, and an outer radius r1 in the range of about 1.5 to 3.0 ?m. The second segment has a ?2% in the range of 0.00 to 0.15%. The third segment has a ?3% in the range of less than 0.35%, an outer radius r3 in the range of about 7 ?m to 11 ?m, a width w3 in the range of about 1.5 to 3 ?m, and volume V3<7% The refractive index profiles of the core segments are selected to provide: zero dispersion wavelength in the range of about 1565 nm to 1600 nm; total dispersion at 1550 nm in the range of about ?6 to ?0.5 ps/nm-km; and dispersion slope at 1550 nm is greater than 0.1.