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 (°C), less than 5%. Further, the optical amplifier fiber has a coefficient of thermal expansion, measured in (/°C), difference between the core and the cladding is less than 2% and an absorption cross section in the range of 0.60 x 10 -24 m2 to 0.72 x 10 -24 m2, in the range of 1530 nm to 1540 nm.
Abstract:
The application relates to an amplifying optical fiber having a central core and an optical cladding surrounding the central core, wherein the central core is based on a silica matrix comprising nanoparticles, which nanoparticles are composed of a matrix material comprising doping ions of at least one rare earth element. The matrix of the nanoparticle is chosen to favor rare earth solubility and dispersion and to favor the amplification process. In addition, the application relates to an optical amplifier and an optical laser comprising the present optical fiber. The invention relates to a method of preparing nanoparticles by adding compounds comprising the elements forming the nanoparticle to an aqueous solution with pH in the range of 6-10 under stirring. Further the invention relates to a method of manufacturing the present optical fiber comprising a heating step to strengthen the nanoparticles.
Abstract:
A method of producing phosphate glasses uses a liquid phase technique for improved yield and control over previously known gas phase reactions. A halogen containing compound of a glass forming element is hydrolysed in the liquid phase with water or aqueous solution to form the oxide or hydroxide precipitate, which is then reacted with phosphoric acid. The phosphorus containing mixture is then dried and fused to form the glass, which may be drawn for example into optical fibres, optionally after further drying in the fused state.
Abstract:
The present invention relates to an amplifying optical fiber having a central core and an optical cladding surrounding the central core, wherein the central core is based on a silica matrix comprising nanoparticles, which nanoparticles are composed of a matrix material comprising doping ions of at least one rare earth element. The matrix of the nanoparticle is chosen to favor rare earth solubility and dispersion and to favor the amplification process. In addition, the present invention relates to an optical amplifier and an optical laser comprising the present optical fiber. In addition, the invention relates to a method of preparing nanoparticles in an aqueous solution having a predetermined pH, a method of manufacturing the present optical fiber comprising a heat treatment step to eliminate residual water and strengthen the nanoparticles, and uses of said optical fiber.
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.