Patents by Inventor Lars Gruner-Nielsen
Lars Gruner-Nielsen 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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Publication number: 20040052486Abstract: An optical fiber suited for dispersion compensation with simultaneous Raman amplification. The fiber has a central core and an index profile that defines successively concentric regions radially outward of the core. The core has a diameter of between 2 and 5 microns (&mgr;m) and a refractive index difference (&Dgr;n) with respect to the outer cladding of between 0.012 and 0.035. A trench region adjacent the core is between 2 and 6 &mgr;m wide and has a negative &Dgr;n of between −0.015 and −0.003. A ring region adjacent the trench region is between 1 and 5 &mgr;m wide and has a &Dgr;n of between 0.001 and 0.015, and an inner cladding surrounding the ring region has a width of between zero and 5 &mgr;m and a &Dgr;n of between −0.011 and 0.001. A dispersion slope compensating module (DSCM) including the fiber obtains a relatively high Raman gain with respect to conventional DSCMs that are pumped for Raman amplification.Type: ApplicationFiled: September 13, 2002Publication date: March 18, 2004Applicant: Fitel USA Corp.Inventors: Peter Gaarde, Lars Gruner-Nielsen, Christian Larsen, Bera Palsdottir, Yujun Qian
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Patent number: 6707976Abstract: An inverse dispersion fiber is provided that has a relatively low fiber loss, a relatively low fiber splice loss and a relatively large effective mode-field area. The inverse dispersion fiber includes a doped core region with an index of refraction n1, a cladding region with an index of refraction n2, and a trench region, a first barrier region and a second barrier region with indices of refraction n3, n4, and n5, respectively, formed between the doped core region and the cladding region. The various regions of the inverse dispersion fiber are manufactured in such a way that the refractive index value ranges are, for example, approximately 0.709%<(n1−n2)/n2<1.0%, approximately −0.358%<(n3−n2)/n2<−0.293%, approximately 0.194%<(n4−n2)/n2<0.237%, and approximately −0.045%<(n5−n2)/n2<−0.037%.Type: GrantFiled: September 4, 2002Date of Patent: March 16, 2004Assignee: Fitel USA CorporationInventors: Lars Gruner-Nielsen, Stig Nissen Knudsen, Morten Ostergaard Pedersen
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Publication number: 20040042748Abstract: An inverse dispersion fiber is provided that has a relatively low fiber loss, a relatively low fiber splice loss and a relatively large effective mode-field area. The inverse dispersion fiber includes a doped core region with an index of refraction n1, a cladding region with an index of refraction n2, and a trench region, a first barrier region and a second barrier region with indices of refraction n3, n4, and n5, respectively, formed between the doped core region and the cladding region. The various regions of the inverse dispersion fiber are manufactured in such a way that the refractive index value ranges are, for example, approximately 0.709%<(n1−n2)/n2<1.0%, approximately −0.358%<(n3−n2)/n2<−0.293%, approximately 0.194%<(n4−n2)/n2<0.237%, and approximately −0.045%<(n5−n2)/n2<−0.037%.Type: ApplicationFiled: September 4, 2002Publication date: March 4, 2004Inventors: Lars Gruner-Nielsen, Stig Nissen Knudsen, Morten Ostergaard Pedersen
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Patent number: 6654531Abstract: Disclosed is a dispersion-compensating (DC) module [740] comprising a first length of DC optical fiber [10] in tandem with a second length of a standard singlemode optical fiber. The DC fiber is fabricated from silica glass and has a refractive index profile that includes a core region [51] surrounded by a cladding region [52] having a nominal refractive index n4. The core region includes a central core [511] having a nominal refractive index n1, a “trench” [512] surrounding the central core having a nominal refractive index n2, and a “ridge” [513] surrounding the trench having a nominal refractive index n3. A range of refractive index profiles has been found that provides relative dispersion slopes (RDS) that are greater than 0.012 nm−1 and figures of merit that are greater than 200 ps/(nm·dB).Type: GrantFiled: September 30, 2002Date of Patent: November 25, 2003Assignee: Fitel USA Corp.Inventors: Lars Gruner-Nielsen, Poul Kristensen, Quang Nghi Trong Le, Marie Wandel
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Publication number: 20030210876Abstract: A pumped Raman fiber optic amplifier includes two optical fibers whose lengths are determined so that the fibers exhibit dispersions of substantially equal magnitude and opposite sign at the wavelength of an input light signal. The fiber having the positive dispersion has a cylindrical core, an outer cladding, and a refractive index profile with respect to the outer cladding. The core has a diameter of between 3 and 6 microns (&mgr;m) and a difference (&Dgr;n) between the index of the core and the cladding is between 0.015 and 0.035. The index profile includes a trench region adjacent the circumference of the core, and the trench region has a width of between 1 and 4 &mgr;m and a &Dgr;n of between −0.005 and −0.015. The two fibers are slope matched so that the net dispersion of the amplifier remains substantially zero over a broad wavelength interval.Type: ApplicationFiled: May 8, 2002Publication date: November 13, 2003Applicant: Fitel USA Corp.Inventors: Peter Gaarde, Lars Gruner-Nielsen, Bera Palsdottir
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Publication number: 20030190118Abstract: A dispersion compensation module (DCM) for compensating dispersion of an optical fiber transmission link is provided. The optical fiber transmission link comprises a transmission fiber and the DCM. The DCM comprises at least first and second dispersion compensating fibers, DCF1 and DCF2, respectively. DCF1 and DCF2 each have a dispersion, D1 and D2, respectively, a dispersion slope, S1 and S2, respectively, and a relative dispersion slope, RDS1 and RDS2, respectively. The transmission fiber also has a dispersion, DTransFiber, a dispersion slope, STransFiber, and a relative dispersion slope, RDSTransFiber. DCF1 and DCF2 are selected based on their respective relative dispersion slopes, RDS1 and RDS2, respectively. DCF1 and DCF2 have particular, lengths, L1 and L2, respectively.Type: ApplicationFiled: April 3, 2002Publication date: October 9, 2003Inventors: Bent Edvold, Lene V. Jorgensen, Lars Gruner-Nielsen, William A. Reed
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Publication number: 20030174981Abstract: A dispersion compensating fiber and module are described for controlling residual dispersion in a dispersion compensated system. The dispersion compensating fiber is designed with dispersion curve having an inflection point at a wavelength near the optical transmission operating wavelength region. The dispersion curve, having an inflection point near the operating wavelength region, produces a relative dispersion slope that closely matches the relative dispersion slope of the transmission fiber over a relatively wide bandwidth surrounding the operating wavelength region.Type: ApplicationFiled: March 15, 2002Publication date: September 18, 2003Applicant: Fitel USA Corp.Inventors: David John DiGiovanni, William A. Reed, Man F. Yan, Lars Gruner-Nielsen, Susanne Dyrbol
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Patent number: 6603914Abstract: A dispersion compensating fiber is described having a core and cladding as well as methods for making such fiber. The cladding has a first cladding region surrounding the core, a second cladding region surrounding the first cladding region, and a third cladding region surrounding the second cladding region. The core, and the first, second, and third cladding regions are doped to create a refraction index profile characteristic of dispersion compensating fiber. The core is doped with germanium, the first cladding region is doped with fluorine, and the second cladding region is doped with germanium and fluorine. A portion of the cladding is doped with phosphorus, thereby resulting in splice loss reduction.Type: GrantFiled: February 7, 2001Date of Patent: August 5, 2003Assignee: Fitel USA Corp.Inventors: Bent Edvold, Lars Gruner-Nielsen, Stig Nissen Knudsen, Torben Erik Veng
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Publication number: 20030118307Abstract: Disclosed is a dispersion-compensating (DC) module [740] comprising a first length of DC optical fiber [10] in tandem with a second length of a standard singlemode optical fiber. The DC fiber is fabricated from silica glass and has a refractive index profile that includes a core region [51] surrounded by a cladding region [52] having a nominal refractive index n4. The core region includes a central core [511] having a nominal refractive index n1, a “trench” [512] surrounding the central core having a nominal refractive index n2, and a “ridge” [513] surrounding the trench having a nominal refractive index n3. A range of refractive index profiles has been found that provides relative dispersion slopes (RDS) that are greater than 0.012 nm−1 and figures of merit that are greater than 200 ps/(nm·dB).Type: ApplicationFiled: September 30, 2002Publication date: June 26, 2003Inventors: Lars Gruner-Nielsen, Poul Kristensen, Quang Nghi Trong Le, Marie Wandel
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Patent number: 6498887Abstract: Disclosed is a dispersion-compensating (DC) optical fiber 10 that is designed to support the fundamental mode of radiation at 1550 nm. The DC fiber is fabricated from silica glass and has a refractive index profile that includes a core region 51 surrounded by a cladding region 52 having a nominal refractive index n4. The core region includes a central core 511 having a nominal refractive index n1, a “trench” 512 surrounding the central core having a nominal refractive index n2, and a “ridge” 513 surrounding the trench having a nominal refractive index n3. A range of refractive index profiles has been found that provides relative dispersion slopes (RDS) that are greater than 0.012 nm−1 and figures of merit that are greater than 200 ps/(nm·dB). The range is conveniently expressed in terms of index differences and radial dimensions: central core: radius=1.5±0.5 &mgr;m, and 0.015<n1−n4<0.035; trench: width=4.3±1.0 &mgr;m, and −0.Type: GrantFiled: March 15, 2002Date of Patent: December 24, 2002Assignee: Fitel USA Corp.Inventors: Lars Gruner-Nielsen, Poul Kristensen, Quang Nghi Trong Le, Marie Wandel
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Publication number: 20020181912Abstract: Disclosed is a dispersion-compensating (DC) optical fiber 10 that is designed to support the fundamental mode of radiation at 1550 nm. The DC fiber is fabricated from silica glass and has a refractive index profile that includes a core region 51 surrounded by a cladding region 52 having a nominal refractive index n4. The core region includes a central core 511 having a nominal refractive index n1, a “trench” 512 surrounding the central core having a nominal refractive index n2, and a “ridge” 513 surrounding the trench having a nominal refractive index n3. A range of refractive index profiles has been found that provides relative dispersion slopes (RDS) that are greater than 0.012 nm−1 and figures of merit that are greater than 200 ps/(nm·dB).Type: ApplicationFiled: March 15, 2002Publication date: December 5, 2002Inventors: Lars Gruner-Nielsen, Poul Kristensen, Quang Nghi Trong Le, Marie Wandel
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Patent number: 6490398Abstract: Disclosed is a dispersion-compensating (DC) optical fiber 10 that is designed to support only the fundamental mode of radiation at 1550 nm. The DC fiber is fabricated from silica glass and has a refractive index profile that includes a core region 51 surrounded by a cladding region 52 having a nominal refractive index n4. The core region includes a central core 511 having a nominal refractive index n1, a “trench” 512 surrounding the central core having a nominal refractive index n2, and a “ridge” 513 surrounding the trench having a nominal refractive index n3. A range of refractive index profiles has been found that provides figures of merit that are greater than 300 ps/(nm·dB) and relative dispersion slopes that are greater than 0.01 nm−1. The range is conveniently expressed in terms of index differences and radial dimensions: central core: radius=1.5±0.5 &mgr;m, and 0.015<n1−n4<0.035; trench: width=3.5±1.0 &mgr;m, and −0.Type: GrantFiled: February 21, 2001Date of Patent: December 3, 2002Assignee: Fitel USA Corp.Inventors: Lars Gruner-Nielsen, Quang Nghi Trong Le
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Publication number: 20020159731Abstract: Disclosed is a dispersion-compensating (DC) optical fiber 10 that is designed to support only the fundamental mode of radiation at 1550 nm. The DC fiber is fabricated from silica glass and has a refractive index profile that includes a core region 51 surrounded by a cladding region 52 having a nominal refractive index n4. The core region includes a central core 511 having a nominal refractive index n1, a “trench” 512 surrounding the central core having a nominal refractive index n2, and a “ridge” 513 surrounding the trench having a nominal refractive index n3. A range of refractive index profiles has been found that provides figures of merit that are greater than 300 ps/(nm·dB) and relative dispersion slopes that are greater than 0.01 nm−1.Type: ApplicationFiled: February 21, 2001Publication date: October 31, 2002Inventors: Lars Gruner-Nielsen, Quang Nghi Trong Le
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Publication number: 20020159735Abstract: A dispersion compensating fiber is described having a core and cladding. The cladding has a first cladding region surrounding the core, a second cladding region surrounding the first cladding layer, and a third cladding region surrounding the second cladding layer. The core, and the first, second, and third cladding regions are doped to create a refraction index profile characteristic of dispersion compensating fiber. A portion of the cladding is doped with phosphorus, thereby resulting in splice loss reduction.Type: ApplicationFiled: February 7, 2001Publication date: October 31, 2002Inventors: Bent Edvold, Lars Gruner-Nielsen, Stig Nissen Knudsen, Torben Erik Veng