Abstract:
Helium recycling for optical fiber manufacturing in which consolidation process helium is recycled (440) either directly for use in consolidation at high purity or recycled at lower purity adequate for usage in draw or other processes having a lower helium purity. Integrated processes for recycling helium from two or more helium using processes in the optical manufacturing process are also described. Substantial helium and cost savings are recognized.
Abstract:
An ophthalmic filter material having a photopic transmittance (Yp) higher than the scotopic transmittance (Ys), the ratio of Yp:Ys being in the range of 2.0-4.0, a dominant wavelength within the ranges of 580-605 nm and a color purity of 60-75 % whereby colors perceived through the material approximate those of the scene being viewed. A method of producing such a filter material which comprises heating a photochromic glass lens in a reducing atmosphere for a time and at a temperature that is sufficient to impart the recited characteristics to the glass surface and that is equivalent to a flowing hydrogen atmosphere, or immersing a tintable plastic solution in a dye solution for a time sufficient to impart the recited characteristics.
Abstract:
A preform (94) for making an optical fiber is made by depositing silica soot (91) around a tube (90). Pieces of differing glass compositions (81, 82) are placed in the bore of the tube. This preform is then sintered, fused and collapsed. A draw blank is obtained which can be drawn into a low-loss, dispersion managed, single-mode optical fiber.
Abstract:
A single-mode elliptical core optical fiber suitable for the transmission of solitons has a core aspect ratio that changes along the length of the fiber to provide a fiber dispersion that monotonically decreases along the fiber from one end thereof to the other. The fiber preform is drawn from a draw blank having a glass core surrounded by cladding glass and having apertures that are diametrically opposed with respect to the core. The cross-sectional area of the void space within the apertures varies with respect to the longitudinal distance along the apertures.
Abstract:
The invention concerns glasses characterized by the fact that they have a refractive index higher than 1.740; a dilatation coefficient alpha , between 25 and 300 DEG C, between 65 and 70 x 10 / DEG C; and a Littleton point not exceeding 635 DEG C but higher than 600 DEG C; they have the following compositions, expressed in weight percent of oxides: SiO2 23-32.0, Al2O3 1.5-5.0, B2O3 5-9.0, PbO 43-54.0, Li2O 0-0.5, Na2O 0-1.0, K2O 0-1.0, with Li2O + Na2O + K2O
Abstract translation:本发明涉及其折射率高于1.740的事实, 25至300℃之间的膨胀系数α为65至70×10 -7 /℃; Littleton点不超过635℃但高于600℃; 它们具有以氧化物的重量百分数表示的组成:SiO 2 23-32.0,Al 2 O 3 1.5-5.0,B 2 O 3 5-9.0,PbO 43-54.0,Li 2 O 0-0.5,Na 2 O 0-1.0,K 2 O 0-1.0与Li 2 O + Na 2 O + K 2 O <1.0,BaO + SrO 4-9.0,TiO 2 0-4.0,ZrO 2 0-2.0,La 2 O 3 0-3.0,Nb 2 O 5 0-3.0,As 2 O 3 0-0.3,Sb 2 O 3 0-0.4,ZrO 2 + La 2 O 3 + Nb 2 O 5 1.5-4.0。 用于生产用于制造多焦点镜片的片段,特别是光致变色。
Abstract:
A single mode optical waveguide fiber having a core refractive index profile of at least four segments is disclosed. The main features of the core design are at least two non-adjacent core profile segments have positive DELTA %; are, at least two non-adjacent segments have negative DELTA %. The novel waveguide core design provides a single mode waveguide which is suitable for high rate, long regenerator spacing systems which incorporate optical amplifiers. The waveguide core structure also lends itself to the manufacture of dispersion managed waveguide fiber.
Abstract:
Optical signals are dispersed according to their wavelength by an optical path length difference generator (26) that couples a single pathway (12) conveying a plurality of different wavelength signals to multiple pathways (52, 54, 56, 58) separately conveying the different wavelength signals. The optical path length generator (26) can be formed by a reflective stack having a plurality of partially reflective surfaces for reflecting successive portions of the energy of each of the different wavelength signals along different length optical paths.
Abstract:
The invention relates to a thin layer of UV absorbing material, and a method of making such material by grinding UV absorbing glass into fine powder which can be suspended in a liquid matrix, for example, in index matching oil, thereby producing a transparent liquid which can be used to coat any material to impart UV absorption to such material.
Abstract:
Apparatus for forming a refractive index grating in a waveguide (10) in accordance with the invention includes a waveguide (10) formed from a material that changes its index of refraction when exposed to a beam of optical radiation (20), a source of coherent optical radiation for forming a beam of radiation, a mirror (12) arranged to intercept a first part of a beam and to reflect the first part of the beam through an angle, and a phase delay plate (22) arranged to intercept a second part of the beam for delaying the second part of the beam propagating through the plate, in which the mirror (12) and the phase delay plate (22) are arranged so that the first part of the beam and the second delayed part of the beam form an interference pattern on the waveguide for changing the index of refraction of the waveguide, in a pattern corresponding to the interference pattern for forming an index grating in the waveguide (10).
Abstract:
The demultiplexer comprises: a) an inlet wave-guide (1); b) a plurality of outlet wave-guides (5i); c) an assembly (3) of adjacent integrated wave-guides functioning in the form of a phase network; d) a mode-expanding wave-guide (12) arranged at the inlet of the inlet connector (2) and connected to the inlet wave-guides (1); and e) a plurality of mode-reducing wave-guides (16i) arranged at the outlet of the outlet connector (4) and connected in each case to one of the outlet wave-guides (5i). The mode-expanding guide (12) and the aforementioned mode-reducing guides (16i) are of identical geometry with a width that varies linearly in accordance with their length, whereby the width of the aforementioned expanding and reducing guides at their connection to the associated connector is defined in order to optimize the width of the band passing through a channel while limiting the cross-talk between the outlet channels (5i) to a pre-determined level.