Abstract:
Fibre optique à base de silice comprenant au moins un noyau et un revêtement entourant le noyau, celui-ci ainsi que le matériau de revêtement étant produits par un procédé de dépôt en phase de vapeur. Le noyau et/ou le revêtement comprennent au moins deux substituants, l'un choisi parmi Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, et les terres rares du type 4f (les ''modificateurs''), et l'autre choisi parmi B, Al, Ga, In, P, As et Sb (les ''homogénéiseurs''). La concentration maximum des substituants dans la fibre est telle que 3
Abstract:
Glass preforms for optical fibers or the like having refractive index profiles which vary in stepped or graded fashion across the preform, are made from porous glass preforms by introducing a first dopant into the porous preform during manufacture, partially sintering the preform to selectively modify the internal surface area thereof, introducing a second vapor-infusible dopant into the selectively sintered preform to cause selective doping of the porous glass, and then consolidating the resulting doped preform to clear glass.
Abstract:
본 발명은, 회전 대칭성을 가지며, 실리카를 주성분으로 하고, 적어도 외주부분에 기포를 함유하는 기체와, 이 기체의 내표면 상에 형성된, 투명 실리카 유리로 이루어진 내층을 구비하는 실리카 용기의 제조방법으로서, 적어도, 상기 내층을 성형하기 위한 원료분말로서, 입경이 10~1000μm이고, Ca, Sr, Ba을 50~5000wt.ppm의 합계 농도로 함유하고, 진공 하에서 1000℃로 가열했을 때의 수소분자의 방출량이 3×10 16 ~3×10 19 분자/g인 실리카 분말을 준비하고, 이 내층형성용 원료분말인 실리카 분말로부터, 상기 내층을 형성하는 실리카 용기의 제조방법이다. 이에 따라, 고치수정밀도이고, 내벽이 실질적으로 기포를 포함하지 않는 두꺼운 투명 실리카 유리층이면서, 고온에서도 높은 내구성을 갖는 실리카 용기를 저비용으로 제조할 수 있는 실리카 용기 및 그 제조방법, 그리고 이러한 실리카 용기를 제조하기 위한 실리카 분말 및 그 제조방법이 제공된다.
Abstract:
본 발명은, Li, Na, K의 합계 농도가 50wt ppm 이하인 기체형성용 원료분말과, Ca, Sr, Ba를 합계 50~2000wt ppm으로 함유하는 내부층형성용 원료분말을 제작하고, 형틀 내에서 기체의 가성형체를 형성하고, 그 내부표면 상에 내부층의 가성형체를 형성하고, 수소 혹은 헬륨 또는 이들 혼합 가스를 10vol.%를 초과하는 비율로 함유하는 가스 분위기에서, 방전 가열 용융법에 의해 기체와 내부층의 가성형체의 내측으로부터 가열시킴으로써, 기체의 가성형체의 외주부분을 소결체로 함과 동시에, 기체의 가성형체의 내주부분 및 내부층의 가성형체를 용융 유리체로 함으로써, 외주부분에 기포를 함유하는 기체와, 이 기체의 내부표면 상에 형성된, 투명 실리카 유리로 이루어진 내부층을 갖는 실리카 용기를 제조하는 방법이다. 이에 따라, 고 치수정밀도, 고 내열성을 갖는 실리카 용기를 저비용으로 제조 가능한 실리카 용기의 제조 방법 및 이러한 실리카 용기가 제공된다.
Abstract:
A method of forming an alkali metal oxide-doped optical fiber by diffusing an alkali metal into a surface of a glass article is disclosed. The silica glass article may be in the form of a tube or a rod, or a collection of tubes or rods. The silica glass article containing the alkali metal, and impurities that may have been unintentionally diffused into the glass article, is etched to a depth sufficient to remove the impurities. The silica glass article may be further processed to form a complete optical fiber preform. The preform, when drawn into an optical fiber, exhibits a low attenuation.
Abstract:
PURPOSE: An ultra-low loss glass having low Rayleigh scattering loss is provided which is excellent as the mother material of a glass fiber for long distance forwarding by doping impurities to a high purity glass. CONSTITUTION: An ultra low loss glass is obtained by doping at least one metallic oxide selected from Na2O, K2O, Li2O, MgO, CaO, PbO of 1- 500 wt, ppm to a high purity glass which loosen the tetrahedron network structure of silica. The resultant glass is used for the optical fiber due to low Rayleigh scattering compared with a pure silica glass.
Abstract:
The present invention provides a method of making rare earth (RE) doped optical fiber using BaO as co-dopant instead of Al or P commonly used for incorporation of the RE in silica glass by MCVD and solution doping technique. The method comprises deposition of particulate layer of GeO2 doped SiO2 with or without small P2O5 for formation of the core and solution doping by soaking the porous soot layer into an aqueous solution of RE and Ba containing salt. This is followed by dehydration and sintering of the soaked deposit, collapsing at a high temperature to produce the preform and drawing of fibers of appropriate dimension. The use of Ba-oxide enables to eliminate unwanted core-clad interface defect which is common in case of Al doped fibers. The fibers also show good RE uniformity, relatively low optical loss in the 0.6-1.6 µm wavelength region and good optical properties suitable for their application in amplifiers, fiber lasers and sensor devices.
Abstract:
The present invention concerns a preform for an optical fibre, an optical fibre so obtained and methods for making the same. The fibre is characterized in that porous glass doped with at least one dopant for adsorbing light is used. Resulting fibres can be used to make high attenuation fibres. The expression porous glass designates only glasses containing a plurality of interconnected micro-pores obtained by phase separation, e.g. of a boro-silcate glass, not porous soot obtained by a CVD process.
Abstract:
A borosilicate glass composition comprises SiO2 having a concentration of about 40 mole percent to about 60 mole percent, B2O3 having a concentration of about 10 mole percent to about 30 mole percent, and an alkaline earth and/or alkali compound having a concentration of 10 mole percent to about 40 mole percent. An optical fiber amplification device comprises a borosilicate glass material cladding. The core comprises a germanate glass material doped with Tm3+. The germanate glass material has a first surface configured to receive an optical signal having a wavelength of from about 1400 nm to about 1540 nm and a second surface configured to output an amplified optical signal. In this manner, low cost fiber amplifiers in the 1450-1530 nm wavelength region (corresponding to the S-band) can be achieved.