Patents by Inventor Benjamin J Ainslie
Benjamin J Ainslie has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6574406Abstract: The invention provides a selectively absorbing optical fiber that is transparent at pump wavelengths, and highly absorbing at signal wavelengths. The selectively absorbing optical fiber includes selectively absorbing species, such as rare earth ions, in concentrations sufficient to provide the desired absorbance selectivity. The fiber is useful as a fiber pigtail for pump lasers in optical amplifiers, where it can reduce the effects of multi-path interference by absorbing stray light with wavelengths in the signal band.Type: GrantFiled: September 11, 2001Date of Patent: June 3, 2003Assignee: Corning IncorporatedInventors: Benjamin J. Ainslie, Monica K. Davis, Matthew J. Dejneka, David A. S. Loeber, Raymond P. Smith
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Publication number: 20030053773Abstract: The invention provides a selectively absorbing optical fiber that is transparent at pump wavelengths, and highly absorbing at signal wavelengths. The selectively absorbing optical fiber includes selectively absorbing species, such as rare earth ions, in concentrations sufficient to provide the desired absorbance selectivity. The fiber is useful as a fiber pigtail for pump lasers in optical amplifiers, where it can reduce the effects of multi-path interference by absorbing stray light with wavelengths in the signal band.Type: ApplicationFiled: September 11, 2001Publication date: March 20, 2003Inventors: Benjamin J. Ainslie, Monica K. Davis, Matthew J. Dejneka, David A.S. Loeber, Raymond P. Smith
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Patent number: 6229945Abstract: It has been demonstrated that B containing glasses are sensitive to radiation in the band 225-275 nm and, therefore, B2O3 glasses are particularly adapted to receive refractive index modulation, e.g., to make reflection gratings. Glasses containing SiO2 and B2O3 are particularly suitable when the grating is to be localized in the cladding of a fiber. Glasses containing SiO2, GeO2, and B2O3 are suitable when the grating is in the path region of a waveguide, e.g., in the core of a fiber.Type: GrantFiled: August 11, 1999Date of Patent: May 8, 2001Assignee: British Telecommunications public limited companyInventors: Benjamin J Ainslie, Douglas L Williams, Graeme D Maxwell, Raman Kashyap, Jonathan R Armitage
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Patent number: 6097512Abstract: Boron containing glasses are sensitive to radiation in the band 225-275 nm and therefore, B.sub.2 O.sub.3 glasses are particularly adapted to receive refractive index modulation, e.g., to make reflection gratings. Glasses containing SiO.sub.2 and B.sub.2 O.sub.3 are particularly suitable when the grating is to be localized in the cladding of a fibre. Glasses containing SiO.sub.2, GeO.sub.2 and B.sub.2 O.sub.3 are suitable when the grating is in the path region of a waveguide, e.g., in the core of a fibre.Type: GrantFiled: December 21, 1999Date of Patent: August 1, 2000Assignee: British Telecommunications public limited companyInventors: Benjamin J Ainslie, Douglas L Williams, Graeme D Maxwell, Raman Kashyap, Jonathan R Armitage
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Patent number: 6075625Abstract: It has been demonstrated that B containing glasses are sensitive to radiation in the band 225-275 nm and, therefore, B.sub.2 O.sub.3 glasses are particularly adapted to receive refractive index modulation, e.g., to make reflection gratings. Glasses containing SiO.sub.2 and B.sub.2 O.sub.3 are particularly suitable when the grating is to be localized in the cladding of a fiber. Glasses containing SiO.sub.2, GeO.sub.2, and B.sub.2 O.sub.3 are suitable when the grating is in the path region of a waveguide, e.g., in the core of a fiber.Type: GrantFiled: September 22, 1994Date of Patent: June 13, 2000Assignee: British Telecommunications public limited companyInventors: Benjamin J Ainslie, Douglas L Williams, Graeme D Maxwell, Raman Kashyap, Jonathan R Armitage
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Patent number: 5594578Abstract: An optical telecommunications system suitable for operation as a wavelength division multiplex, which system contains at least one filter for attenuating signals at wavelength which are unwanted at a location of the filter, characterized in that the filter comprises an optical fiber which contains a dopant adapted to absorb the unwanted signals.Type: GrantFiled: August 25, 1993Date of Patent: January 14, 1997Assignee: British Telecommunications public limited companyInventors: Benjamin J. Ainslie, Iain J. Wilkinson, Timothy Finegan
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Patent number: 5533156Abstract: A planar waveguiding device has the cores of fibre tails directly connected to the path regions of the waveguiding structure. The devices are produced by attaching the fibre tails before the path layer is deposited. The direct connections are produced when the path layer is sintered.Type: GrantFiled: May 12, 1995Date of Patent: July 2, 1996Assignee: British Telecommunications, plcInventors: Graeme D. Maxwell, Benjamin J. Ainslie
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Patent number: 5465312Abstract: A planar waveguiding device has the cores of the fibre tails directly connected to the path regions of the waveguiding structure. The devices are produced by attaching the fibre tails before the path layer is deposited. The direct connections are produced when the path layer is sintered.Type: GrantFiled: August 10, 1993Date of Patent: November 7, 1995Assignee: British Telecommunications, plcInventors: Graeme D. Maxwell, Benjamin J. Ainslie
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Patent number: 5412672Abstract: Optical wave-guides, e.g. fibres, for use as photonic amplifiers have a path region partly or, preferably, wholly composed as a silica/germania glass with 0.1 to 5000 ppm mole of Er.sup.3+ as a lasing additive and alumina to adjust the bandwidth, the Ge:Al mole ratio being more than 2.8, e.g. 1:0.001 to 0.25. It is surprising that low amounts of alumina have a useful and significant effect on the lasing bandwidth whereby frequency division multiplex is facilitated.Type: GrantFiled: December 10, 1993Date of Patent: May 2, 1995Assignee: British Telecommunications public limited companyInventors: Benjamin J. Ainslie, Susan P. Craig-Ryan
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Patent number: 5278850Abstract: Optical wave-guides, e.g. fibres, for use as photonic amplifiers have a path region partly or, preferably, wholly composed as a silica/germania glass with 0.1 to 5000 ppm mole of Er.sup.3+ as a lasing additive and alumina to adjust the bandwidth, the Ge:Al mole ratio being more than 2.8, e.g. 1:0.001 to 0.25. It is surprising that low amounts of alumina have a useful and significant effect on the lasing bandwidth whereby frequency division multiplex is facilitated.Type: GrantFiled: December 16, 1992Date of Patent: January 11, 1994Assignee: British TelecommunicationsInventors: Benjamin J. Ainslie, Susan P. Craig-Ryan
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Patent number: 5129021Abstract: An optical 1.times.N star coupler has a single mode input fibre (I) and N single mode output fibres (O.sub.1) forming an output fibre assembly. The output fibres (O) are tapered within a former (2) which holds each output fibre (O) so it is positioned substantially identically relative to the remaining output fibres. The input fibre (I) is also tapered such that the fundamental mode field of the input fibre (I) and output fibre assembly are substantially equal. The identical relative positions of the output fibres (O) provides a wavelength independent 1.times.N star coupler.Type: GrantFiled: January 10, 1991Date of Patent: July 7, 1992Assignee: British Telecommunications Public Limited CompanyInventors: David B. Mortimore, David B. Payne, Benjamin J. Ainslie
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Patent number: 4974933Abstract: Optical fibre contains a colloidal semiconductor dispersed in the core or the cladding or both. The fibre may have active regions in which the semiconductor is dispersed and passive regions in which the semiconductor is dissolved. This is obtained by drawing a preform to get fibre in which the semiconductor is dispersed and selected portions (or else the whole fibre) are treated to precipitate the semiconductor in colloidal form.Type: GrantFiled: May 22, 1987Date of Patent: December 4, 1990Assignee: British Telecommunications plcInventors: Benjamin J. Ainslie, Howard P. Girdlestone
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Patent number: 4946251Abstract: The guiding layers of optical waveguides are formed of arsenosilicate glass (ASG). By varying the arsenic content from 2 to 13 mole percent it is possible to vary the refractive index in the range 1.45 to 1.53. Pure silica or less heavily doped ASG can be used for the cladding layers. The ASG is preferably formed as the result of a heterogeneous reaction between silane and oxygen in the presence of arsine. Such a reaction can be carried out at temperatures down to 390.degree. C., allowing the ASG to be used on substrates of III-V compounds.Type: GrantFiled: September 5, 1989Date of Patent: August 7, 1990Assignee: British Telecommunications public limited companyInventors: Gareth W. B. Ashwell, Benjamin J. Ainslie
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Patent number: 4923279Abstract: An optical fibre for use in fibre lasers has the lasing additive eg Er.sup.3+, concentrated in center of the core. Preferably the core has an inner region which contains the additive and an outer region which is dopant free. The concentration of the dopant reduces the pump threshold for a laser and improves the gain performance for a given pump power. The fibre is conveniently made in MCVD. The use of Al.sub.2 O.sub.3 in the inner zone appears to reduce loss of dopant during tube collapse.Type: GrantFiled: October 13, 1988Date of Patent: May 8, 1990Assignee: British Telecommunications plcInventors: Benjamin J. Ainslie, Susan P. Craig, Jonathan R. Armitage
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Patent number: 4799946Abstract: Rare earth elements, e.g. Nd, are introduced into optical glass fibre for telecommunications by evaporating a suitable salt, e.g. NdCl.sub.3, from a glass sponge into the gas stream used to deposit core material. Preferred sponges are in the form of tubes having an outer impervious layer and an inner porous layer. These sponges are conveniently made by MCVD and the impregnation is preferably carried out using an alcoholic solution of the impregnant.Type: GrantFiled: March 20, 1987Date of Patent: January 24, 1989Assignee: British Telecommunications plcInventors: Benjamin J. Ainslie, Susan P. Craig
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Patent number: 4675038Abstract: An improved method of manufacturing an optical fibre by vapor phase deposition of layers of cladding and core material for an optical fibre on the inside of a tubular substrate, followed by heating of the tube to cause it to collapse into a preform and drawing of the preform to form the fibre, includes performing the collapse with the introduction of chlorine gas acting as a drying agent. An alternative to chlorine gas is a vapor which decomposes in situ to yield chlorine without producing a solid deposit.Type: GrantFiled: April 21, 1986Date of Patent: June 23, 1987Assignee: British Telecommunications Public Limited CompanyInventors: Benjamin J. Ainslie, Clive R. Day, Keith J. Beales
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Patent number: 4566754Abstract: An optical fibre capable of monomode transmission in, and having a wavelength of zero dispersion in, the 1.55 .mu.m window and having a core comprising silica and germanium dioxide and a cladding comprising silica is drawn from an appropriate preform at a temperature in the range from 1900.degree. C. to 2000.degree. C. Fibres thus produced have low loss compared with fibres drawn at higher temperature.Type: GrantFiled: March 23, 1982Date of Patent: January 28, 1986Assignee: British TelecommunicationsInventors: Keith J. Beales, Clive R. Day, Benjamin J. Ainslie, James D. Rush
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Patent number: RE35946Abstract: An optical fibre for use in fibre lasers has the lasing additive eg Er.sup.3+, concentrated in center of the core. Preferably the core has an inner region which contains the additive and an outer region which is dopant free. The concentration of the dopant reduces the pump threshold for a laser and improves the gain performance for a given pump power. The fibre is conveniently made in MCVD. The use of Al.sub.2 O.sub.3 in the inner zone appears to reduce loss of dopant during tube collapse.Type: GrantFiled: May 6, 1992Date of Patent: November 3, 1998Assignee: British Telecommunications plcInventors: Benjamin J. Ainslie, Susan P. Craig, Jonathan R. Armitage