Patents by Inventor Lothar Brehm
Lothar Brehm 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: 10974991Abstract: A device for coating a fiber includes a fiber receiving arrangement and a coating arrangement which includes an application unit which wets the fiber with a coating agent, and a curing unit arranged downstream of the application unit which optically cures the coating agent. The curing unit includes a lamp which emits at least one light beam which is aimed directly or indirectly at a surface of the fiber. A main radiation direction of the lamp includes a beam angle between the main radiation direction and a longitudinal direction of the fiber of less than 40°. The fiber receiving arrangement and the application unit are movable relative to each other in the longitudinal direction of the fiber via a translational motion arrangement so that a wetting process is implemented substantially along an entire length of the fiber.Type: GrantFiled: December 16, 2016Date of Patent: April 13, 2021Assignee: J-FIBER GMBHInventors: Robert Hanf, Lothar Brehm, Juergen Rosenkranz
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Patent number: 10604440Abstract: A method for a defined deposition of a glass layer on an inner wall of a preform for an optical fiber and/or for setting a refractive index profile of the preform for a multi-mode fiber. The method includes providing the preform having a cavity and an inner wall which defines an inner diameter of the preform, and spreading a deposition gas at a flow speed (v) in the cavity of the preform so as to provide the defined deposition of the glass layer. The defined deposition is performed at a reduced change in the flow speed a*?v, where a<1. Based on the defined deposition, a change in the flow speed (?v): ? ? ? v = 4 ? ? Q ? · ( 1 d i 2 - 1 d i + 1 2 ) forms at a volume flow (Q), a first diameter (di), and a second diameter (di+1).Type: GrantFiled: July 13, 2016Date of Patent: March 31, 2020Assignee: J-FIBER GMBHInventors: Robert Hanf, Christian Genz, Lothar Brehm
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Patent number: 10131565Abstract: Preform for an optical waveguide containing a core with a non-circular geometry and at least one cladding layer, in which the dopand concentration of the cladding layer is increased compared to the dopand concentration of a preform with circular core geometry and identical NA. A method for the production of a preform for an optical fiber is provided. An optical waveguide with a nominal dopand concentration of c(eff)×F?c(nom) in at least one cladding layer is also provided.Type: GrantFiled: April 15, 2015Date of Patent: November 20, 2018Assignee: j-plasma GmbHInventors: Ralitsa Rosenow, Roland Heinze, Jörg Kötzing, Robert Hanf, Lothar Brehm
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Publication number: 20180201536Abstract: A method for a defined deposition of a glass layer on an inner wall of a preform for an optical fiber and/or for setting a refractive index profile of the preform for a multi-mode fiber. The method includes providing the preform having a cavity and an inner wall which defines an inner diameter of the preform, and spreading a deposition gas at a flow speed (v) in the cavity of the preform so as to provide the defined deposition of the glass layer. The defined deposition is performed at a reduced change in the flow speed a*?v, where a<1. Based on the defined deposition, a change in the flow speed (?v): ? ? ? v = 4 ? ? Q ? · ( 1 d i 2 - 1 d i + 1 2 ) forms at a volume flow (Q), a first diameter (di), and a second diameter (di+1).Type: ApplicationFiled: July 13, 2016Publication date: July 19, 2018Applicant: J-FIBER GMBHInventors: ROBERT HANF, CHRISTIAN GENZ, LOTHAR BREHM
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Patent number: 9976880Abstract: A sensor fiber for the detection of changes of temperature, bending, and/or torsion includes a multicore optical waveguide with a fiber Bragg grating (FBG) structure. One embodiment contains at least two FBG cores and a surrounding cladding. The sensor fiber is characterized by one or more distinction and orientation means which produce a marker zone to assign and label each individual FBG core.Type: GrantFiled: July 26, 2013Date of Patent: May 22, 2018Assignee: S-fiber, GmbHInventors: Lothar Brehm, Jurgen Rosenkranz, Otto Bernauer, Ralitsa Rosenow, Armin Landers, Katrin Roessner, Robert Hanf
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Patent number: 9753221Abstract: An optical coupler is used to optically couple a multicore fiber with multiple optical cores to multiple individual fibers and contains a support in which the multicore fiber is embedded, the cores exiting at a polished end surface. The cores are assembled into groups along lines, and each group is oriented along a line. Waveguides of multiple planar support elements, the waveguides being introduced into the surface of the support elements, are connected to the end surface, each group of cores being coupled into a support element. In this manner, the multicore fiber can be coupled to individual fibers using planar waveguide technology.Type: GrantFiled: February 8, 2016Date of Patent: September 5, 2017Assignee: LEONI Kabel Holding GmbHInventors: Peggy Baerenklau, Lothar Brehm, Maria Kufner, Stefan Kufner
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Patent number: 9738556Abstract: A method for producing rod lenses with an enveloping diameter of the rod lens face of up to 200 mm and an edge length of at least 800 mm. The method is characterized in that fabrication is performed from a cylindrical rod lens element made from synthetic quartz glass material configured as a fused silica ingot. This is performed using a flame hydrolysis method with a direct one stage deposition process of SIOx particles from a flame stream onto die that rotates and is moveable in a linear manner with respect to the flame stream.Type: GrantFiled: November 11, 2015Date of Patent: August 22, 2017Assignee: J-PLASMA GMBHInventors: Lothar Brehm, Frank Coriand, Wolfgang Schmidt, Ulrich Strobel
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Patent number: 9720264Abstract: The invention relates to a method for producing a polarization-maintaining optical fiber, consisting of a core region and stress-generating elements embedded in the fiber body, having the following method steps: producing a core preform for the core region using internal deposition on a substrate tube, the internally coated substrate tube subsequently being collapsed, generating recesses on the core preform by virtue of the material on the outer surface of the core preform being removed parallel to the longitudinal axis of the core preform at diametrically opposed positions, filling the recesses with stress-generating rods, with the tightest possible rod packing, in a freely selectable first filling geometry, possibly filling the recesses in addition with non-stress-generating rods in a second filling geometry, sheathing the filled core preform with a jacketing tube, preparing the sheathed core preform for a fiber-drawing process, and drawing the sheathed arrangement to form the optical fiber.Type: GrantFiled: May 6, 2015Date of Patent: August 1, 2017Assignee: J-FIBER GMBHInventors: Thomas Gutsche, Wolfgang Hämmerle, Robert Hanf, Lothar Brehm
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Publication number: 20170190614Abstract: A device for coating a fiber includes a fiber receiving arrangement and a coating arrangement which includes an application unit which wets the fiber with a coating agent, and a curing unit arranged downstream of the application unit which optically cures the coating agent. The curing unit includes a lamp which emits at least one light beam which is aimed directly or indirectly at a surface of the fiber. A main radiation direction of the lamp includes a beam angle between the main radiation direction and a longitudinal direction of the fiber of less than 40°. The fiber receiving arrangement and the application unit are movable relative to each other in the longitudinal direction of the fiber via a translational motion arrangement so that a wetting process is implemented substantially along an entire length of the fiber.Type: ApplicationFiled: December 16, 2016Publication date: July 6, 2017Applicant: J-FIBER GMBHInventors: ROBERT HANF, LOTHAR BREHM, JUERGEN ROSENKRANZ
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Publication number: 20170075147Abstract: The invention relates to a method for producing a polarization-maintaining optical fibre, consisting of a core region and stress-generating elements embedded in the fibre body, having the following method steps: producing a core preform for the core region using internal deposition on a substrate tube, the internally coated substrate tube subsequently being collapsed, generating recesses on the core preform by virtue of the material on the outer surface of the core preform being removed parallel to the longitudinal axis of the core preform at diametrically opposed positions, filling the recesses with stress-generating rods, with the tightest possible rod packing, in a freely selectable first filling geometry, possibly filling the recesses in addition with non-stress-generating rods in a second filling geometry, sheathing the filled core preform with a jacketing tube, preparing the sheathed core preform for a fibre-drawing process, and drawing the sheathed arrangement to form in the optical fibre.Type: ApplicationFiled: May 6, 2015Publication date: March 16, 2017Inventors: Thomas Gutsche, Wolfgang Hämmerle, Robert Hanf, Lothar Brehm
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Method for the unidirectional and or bidirectional removal of a cladding layer of an optical preform
Patent number: 9475729Abstract: The invention describes a method for the removal of glass where the parameters of the removal process are set over the length of the substrate (preform) so that a uniform removal can be achieved over the complete substrate length.Type: GrantFiled: October 23, 2015Date of Patent: October 25, 2016Assignee: j-plasma GmbHInventors: Jörg Kötzing, Robert Hanf, Lothar Brehm -
Patent number: 9382149Abstract: Methods for producing a semifinished part for the manufacture of an optical fiber are disclosed. The methods are optimized in terms of bending. The methods include the steps of providing a shell tube with a shell refractive index which is lower in relation to the light-conducting core. Then, at least one protective, intermediate and/or barrier layer is applied to a radially outermost and/or innermost tube surface of the respective shell tube, wherein a build-up of light-conducting layers is realized on the inner side and/or the outer side of the shell tube. Finally, the shell tubes are joined by collapsing so as to form the semifinished part.Type: GrantFiled: May 10, 2012Date of Patent: July 5, 2016Assignee: j-plasma GmbHInventors: Lothar Brehm, Matthias Auth, Jörg Kötzing
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Publication number: 20160170144Abstract: An optical coupler is used to optically couple a multicore fiber with multiple optical cores to multiple individual fibers and contains a support in which the multicore fiber is embedded, the cores exiting at a polished end surface. The cores are assembled into groups along lines, and each group is oriented along a line. Waveguides of multiple planar support elements, the waveguides being introduced into the surface of the support elements, are connected to the end surface, each group of cores being coupled into a support element. In this manner, the multicore fiber can be coupled to individual fibers using planar waveguide technology.Type: ApplicationFiled: February 8, 2016Publication date: June 16, 2016Inventors: PEGGY BAERENKLAU, LOTHAR BREHM, MARIA KUFNER, STEFAN KUFNER
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Method for the Unidirectional and or Bidirectional Removal of a Cladding Layer of an Optical Preform
Publication number: 20160115075Abstract: The invention describes a method for the removal of glass where the parameters of the removal process are set over the length of the substrate (preform) so that a uniform removal can be achieved over the complete substrate length.Type: ApplicationFiled: October 23, 2015Publication date: April 28, 2016Inventors: Jörg Kötzing, Robert Hanf, Lothar Brehm -
Publication number: 20160060155Abstract: A method for producing rod lenses with an enveloping diameter of the rod lens face of up to 200 mm and an edge length of at least 800 mm. The method is characterized in that fabrication is performed from a cylindrical rod lens element made from synthetic quartz glass material configured as a fused silica ingot. This is performed using a flame hydrolysis method with a direct one stage deposition process of SIOx particles from a flame stream onto die that rotates and is moveable in a linear manner with respect to the flame stream.Type: ApplicationFiled: November 11, 2015Publication date: March 3, 2016Inventors: Lothar Brehm, Frank Coriand, Wolfgang Schmidt, Ulrich Strobel
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Patent number: 9255026Abstract: Methods for making active laser fibers include the production of an optical fiber with disturbed (or deviated) cylindrical symmetry on the glass surface of the fiber. The methods include a preform containing a central core made of glass. In one embodiment, the preform is circular and surrounded by additional glass rods and an outer glass jacket tube. In a first alternative embodiment, this preform is merged during fiber drawing. In a second alternative embodiment, the preform merged in a process forming a compact glass body with disturbed cylindrical symmetry. This compact preform is drawn into a fiber under conditions maintaining the disturbed cylindrical symmetry.Type: GrantFiled: March 6, 2013Date of Patent: February 9, 2016Assignee: j-fiber, GmbHInventors: Jurgen Rosenkranz, Wolfgang Haemmerle, Lothar Brehm, Katrin Roessner, Robert Hanf
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Patent number: 9249046Abstract: Methods for making a preform for a graded-index multimode fiber by using an inside deposition process are disclosed. The methods are characterized by an iterative refractive index profile correction with the following steps: determining a target refractive index profile for the preform to be produced, carrying out an inside deposition process with fixed volume flows for the reacting gases inside a tube and a given burner speed for all deposited layers, collapsing the tube and measuring the actual refractive index profile, comparing the target profile with the actual profile and calculating a correction value of index differences, converting this correction value in corrected burner speeds as varying process parameter, carrying out a inside deposition process with fixed gas flows and corrected burner speeds for all layers to be deposited.Type: GrantFiled: July 18, 2013Date of Patent: February 2, 2016Assignee: j-fiber, GmbHInventors: Christian Genz, Wolfgang Haemmerle, Lothar Brehm
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Publication number: 20150301278Abstract: Preform for an optical waveguide containing a core with a non-circular geometry and at least one cladding layer, in which the dopand concentration of the cladding layer is increased compared to the dopand concentration of a preform with circular core geometry and identical NA. A method for the production of a preform for an optical fiber is provided. An optical waveguide with a nominal dopand concentration of c(eff) x F?c(nom) in at least one cladding layer is also provided.Type: ApplicationFiled: April 15, 2015Publication date: October 22, 2015Inventors: Ralitsa Rosenow, Roland Heinze, Jörg Kötzing, Robert Hanf, Lothar Brehm
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Patent number: 9164229Abstract: The invention relates to a bend insensitive gradient index multi-mode light conducting fiber comprising a leakage mode dependent optical core diameter that is uniform over its length and a numerical aperture that is uniform over its length, wherein for a light wavelength of 850 nm and an overfilled launch (OFL), the optical core diameter for a fiber length in a range between 2 m and 100 m decreases by less than 5% and the numerical aperture decreases by less than 2.5% and the curvature related attenuation increase for two turns and a curvature radius of 7.5 mm is less than 0.2 db.Type: GrantFiled: July 23, 2014Date of Patent: October 20, 2015Assignee: J-FIBER GMBHInventors: Wolfgang Hämmerle, Christian Genz, Lothar Brehm, Falk Wirth
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Publication number: 20150043880Abstract: Methods for producing a semifinished part for the manufacture of an optical fiber are disclosed. The methods are optimized in terms of bending. The methods include the steps of providing a shell tube with a shell refractive index which is lower in relation to the light-conducting core. Then, at least one protective, intermediate and/or barrier layer is applied to a radially outermost and/or innermost tube surface of the respective shell tube, wherein a build-up of light-conducting layers is realized on the inner side and/or the outer side of the shell tube. Finally, the shell tubes are joined by collapsing so as to form the semifinished part.Type: ApplicationFiled: May 10, 2012Publication date: February 12, 2015Applicant: j-plasma GmbHInventors: Lothar Brehm, Matthias Auth, Jörg Kötzing