Abstract:
In accordance with the present invention, there is an optical amplifier fiber comprising a core manufactured from a phosphate glass doped with a rare earth element and a cladding manufactured from a phosphate glass surrounding the core. The core has a radiative lifetime in the range of 7 to 9 milliseconds at 1535 nm, a fluorescence lifetime of greater than 7.5 milliseconds at 1535 nm. The optical amplifier fiber has a diameter ratio in the range of 0.036 to 0.044, a transformation point difference of the core and the cladding, measured in (nullC.), less than 5%. Further, the optical amplifier fiber has a coefficient of thermal expansion, measured in (/nullC.), difference between the core and the cladding is less than 2% and an absorption cross section in the range of 0.60null10null24m2 to 0.72null10null24 m2, in the range of 1530 nm to 1540 nm.
Abstract:
A glass optical waveguide preform is formed by chemical reaction of gaseous and/or vaporized ingredients within a glass substrate tube. A reactant feed tube extends into a first end of the substrate tube. One of the reactants flows through the feed tube, and another flows through the annular channel between the feed and substrate tubes. The reactants combine just downstream of the end of the feed tube and react to form particulate material, at least a portion of which deposit in the substrate tube. The output end of the feed tube traverses the substrate tube so that the region of maximum soot deposition moves along the length of the substrate tube. A hot zone traverses the substrate tube in synchronism with the feed tube to sinter the deposited soot.
Abstract:
PHOSPHATE GLASSES FOR OPTICAL APPLICATIONS ARE PRODUCED BY AN IMPROVED METHOD IN WHICH THE CERAMIC UTENSILS UTILIZED IN THE PRODUCTION OF THE GLASS ARE FORMED OF TIN OXIDE.
Abstract:
Embodiments of the invention relate to a hydrogen-resistant optical fiber with a core having a central axis. The core may include only silica, or only silica and fluorine, while a cladding region surrounding the core may be made of silica and fluorine, along with at least one of germanium, phosphorus, and titanium.
Abstract:
A photonic band gap fiber and method of making thereof is provided. The fiber is made of a non-silica-based glass and has a longitudinal central opening, a microstructured region having a plurality of longitudinal surrounding openings, and a jacket. The air fill fraction of the microstructured region is at least about 40%. The fiber may be made by drawing a preform into a fiber, while applying gas pressure to the microstructured region. The air fill fraction of the microstructured region is changed during the drawing.
Abstract:
An optical fiber amplifier module (10) is disclosed which comprises a signal path (30) located between a signal input (12) and a signal output(16). A WDM coupler (50) and an amplifying gain medium (70) are disposed along the signal path (30). A pump laser (60) is disposed out of the signal path (30) in a manner that allows a pump signal from the pump laser (60) to reflect off the WDM coupler (50) and enter the signal path (30). An embodiment utilizing a second WDM coupler and a second pump laser is also disclosed.
Abstract:
Optical devices and a method for manufacturing these devices. One optical device includes a core region having a first medium of a first refractive index nl, and includes a cladding region exterior to the core region. The cladding region includes a second medium having a second refractive index n2 higher than the first refractive index nl. The cladding region further includes a third medium having a third refractive index n3 lower than the first refractive index nl . The third medium is dispersed in the second medium to form a plurality of microstructures in the cladding region. Another optical device includes a plurality of core regions including at least one core having a doped first medium, and includes a cladding region exterior to the plurality of core regions. The core regions and the cladding region include a phosphate glass.
Abstract:
An optical fiber amplifier module is disclosed which comprises a signal path located between a signal input and a signal output. A WDM coupler and an amplifying gain medium are disposed along the signal path. A pump laser is disposed out of the signal path in a manner that allows a pump signal from the pump laser to reflect off the WDM coupler and enter the signal path. An embodiment utilizing a second WDM coupler and a second pump laser is also disclosed.