Abstract:
A dispersion flattened non-zero dispersion shifted optical waveguide fiber which includes a central core region surrounded by an outer cladding region, the central core region having an alpha less than 4. The optical fiber has a dispersion at a wavelength of about 1550 nm of between about 4 ps/nm/km and about 8 ps/nm/km, and a dispersion slope of less than 0.025 ps/nm2/km at every wavelength between about 1525 nm and 1650 nm.
Abstract:
An optical waveguide fiber (10) including a centermost core segment (20) surrounded by four other core segments (30, 40, 50, 60). At a wavelength of about 1550 nm, the optical fiber exhibits an effective area of greater than about 50 µm 2 , a dispersion of greater than about 4 ps/nm/km, and a dispersion slope of less than about 0.03 ps/nm 2 /km.
Abstract:
Dispersion shifted fiber having low dispersion slope comprising a centre core, two claddings, a ring core and the outer glass region, wherein the first cladding is provided onto the outer periphery of the centre core, the second cladding is provided onto outer periphery of the first cladding and the ring core is provided onto outer periphery of the second cladding, and the outer glass region surrounds the ring core, and the centre core and the ring core have higher refractive indices, and the claddings have lower refractive indices than the outer glass region, and the refractive indices are constrained by the equation n 1 > n 4 > n 5 >n 2 > n 3 . In accordance with preferred embodiment the fibre comprises of a centre core, two claddings, two ring cores, and an outer glass region, wherein the first cladding is provided onto the outer periphery of the centre core, the second cladding 3 is provided onto the outer periphery of the first cladding, the first ring core is provided onto the outer periphery of the second cladding, the second ring core 5 is provided onto the outer periphery of the first ring core and the outer glass region surrounds the second ring core, and the refractive indices are constrained by the equation n 1 > n 4 > n 5 > n 6 > n 2 > n 3 .
Abstract:
A negative total dispersion waveguide fiber having low attenuation and compresses the launched signal pulse when the laser is positively chirped. The laser is provided at optimum bias, which results in positive chirp, but no dispersion penalty is incurred in the link. The waveguide fiber is used a dispersion compensating fiber in a high performance multiplexed telecommunications link. Curve (96) in figure 8 representative of a link comprising fiber having negative dispersion waveguide fibers. Curve (98) is representative of a link comprising fiber having negative dispersion at 1550 nm in accordance with the invention. Curve (100) is representative of a link comprising fiber in accordance with the invention and a laser source that is even more positively chirped thanthe laser to generate curve (98).
Abstract:
The invention is directed to a single mode optical waveguide fiber profile (18, 20, 22, 24) that provides relatively large effective area while limiting macrobend loss. The large effective area results from configuring the core of the waveguide fiber to shift propagated light power away from the waveguide center. Macrobend loss, as measured by pin array or 20 mm mandrel testing, is maintained low by means of a power-limiting index depression (24) surrounding the central core region of the waveguide. In addition, low attenuation is achieved and cut off wavelength is controlled to provide a telecommunications operating window in the wavelength range of about 1250 nm to 1700 nm.
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 Δ 26MAX than that maximum relative refractive index percent Δ 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 R 32 to a radius R 34 , (b) a second annular cladding region (34) extending from the radius R 34 to a radius R 36 , (c) a third annular cladding region (36) surrounding the second annular region (34) and extending from the radius R 34 to an outermost glass radius R 36 ; wherein the core (20) comprises a maximum relative refractive index percent, Δ CMAX ; wherein said first annular cladding region (32) comprises relative refractive index percent Δ 32 (r) % the second annular cladding region (34) comprises a minimum relative refractive index percent, Δ 34 MIN , wherein Δ CMAX > Δ 32MAX > Δ 34MIN , and Δ 34MIN 2 . The second annular cladding region may contain a plurality of randomly dispersed holes.