Patents by Inventor Snigdharaj K. Mishra
Snigdharaj K. Mishra 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: 7272289Abstract: An optical fiber having both low macrobend loss and low microbend loss. The fiber has a MAC number less than 7.0 and a zero dispersion wavelength less than 1450 nm. The optical fiber advantageously comprises a primary coating and a secondary coating. The primary coating has a Young's modulus of less than 1.0 MPa and a glass transition temperature of less than ?25° C. The secondary coating surrounds the primary coating, and the secondary coating has a Young's modulus of greater than 1200 MPa. The macrobend loss as measured by a 20 mm diameter bend test at 1550 nm is not more than 5.0 dB/m. Optical fiber ribbon and optical fiber cable that include the optical fiber is also disclosed.Type: GrantFiled: September 30, 2005Date of Patent: September 18, 2007Assignee: Corning IncorporatedInventors: Scott R. Bickham, Snigdharaj K. Mishra, Steven S. Rosenblum
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Patent number: 7254305Abstract: An optical waveguide fiber having a multi-segmented core surrounded by a cladding, the core having a central segment and an annular segment surrounding the central segment. The central segment has a positive relative refractive index profile, and the annular segment has a negative relative refractive index profile. The optical fiber exhibits an effective area of greater than about 75 ?m2 at a wavelength of about 1550 nm, a dispersion slope of less than 0.07 ps/nm2/km at a wavelength of about 1550 nm, a zero-dispersion wavelength of between about 1290 and 1330 nm, and an attenuation of less than 0.20 dB/km, and preferably less than 0.19 dB/km, at a wavelength of about 1550 nm.Type: GrantFiled: November 6, 2006Date of Patent: August 7, 2007Assignee: Corning IncorporatedInventor: Snigdharaj K. Mishra
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Patent number: 7187833Abstract: An optical waveguide fiber having a multi-segmented core surrounded by a cladding, the core having a central segment and an annular segment surrounding the central segment. The central segment has a positive relative refractive index profile, and the annular segment has a negative relative refractive index profile. The optical fiber exhibits an effective area of greater than about 75 ?m2 at a wavelength of about 1550 nm, a dispersion slope of less than 0.07 ps/nm2/km at a wavelength of about 1550 nm, a zero-dispersion wavelength of between about 1290 and 1330 nm, and an attenuation of less than 0.20 dB/km, and preferably less than 0.19 dB/km, at a wavelength of about 1550 nm.Type: GrantFiled: April 29, 2004Date of Patent: March 6, 2007Assignee: Corning IncorporatedInventor: Snigdharaj K. Mishra
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Patent number: 7106934Abstract: A low attenuation optical waveguide fiber having medium dispersion is disclosed. The core and the cladding are selected to provide a spectral attenuation at 1550 nm of less than 0.195 dB/km. The optical fiber exhibits an effective area of greater than about 60 ?m2 at a wavelength of about 1550 nm, a dispersion slope of less than 0.07 ps/nm2/km at a wavelength of about 1550 nm, and a zero-dispersion wavelength of less than about 1500 nm.Type: GrantFiled: June 30, 2005Date of Patent: September 12, 2006Assignee: Corning IncorporatedInventor: Snigdharaj K. Mishra
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Patent number: 7046891Abstract: An optical waveguide fiber having large effective area, low slope, low cutoff, and low attenuation is disclosed. The optical fiber has at least two core segments and the inner profile volume of the core of the fiber is greater than 2.0%-?m2.Type: GrantFiled: July 13, 2004Date of Patent: May 16, 2006Assignee: Corning IncorporatedInventors: Snigdharaj K. Mishra, Steven S. Rosenblum
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Patent number: 7024083Abstract: An optical waveguide fiber including a central core region extending radially outward from the centerline and having a non-negative relative refractive index percent profile. The optical fiber exhibits an effective area of greater than about 60 ?m2 at a wavelength of about 1550 nm, a dispersion slope of less than 0.07 ps/nm2/km at a wavelength of about 1550 nm, and a zero-dispersion wavelength of less than about 1450 nm.Type: GrantFiled: April 27, 2004Date of Patent: April 4, 2006Assignee: Corning IncorporatedInventors: Scott R. Bickham, Snigdharaj K. Mishra, Steven S. Rosenblum
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Patent number: 6952519Abstract: An optical waveguide fiber having a high threshold for stimulated Brillouin scattering. The optical fiber preferably has large optical effective area, and further preferably has a low zero dispersion wavelength.Type: GrantFiled: April 5, 2004Date of Patent: October 4, 2005Assignee: Corning IncorporatedInventors: Scott R. Bickham, Dipakbin Q. Chowdhury, Madison L. Howard, Shiva Kumar, Daiping Ma, Snigdharaj K. Mishra, A. Boh Ruffin, Sergey Y. Ten
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Patent number: 6925237Abstract: A dispersion compensating optical fiber that includes a segmented core having a central core segment, a moat segment, and a ring segment wherein the ring segment is preferably offset from the moat outer radius, r2, by a ring offset, Xo, greater than 0.4 ?m. The refractive index profile is selected to provide a total dispersion at 1550 nm of between about ?120 and ?145 ps/nm/km, and a total dispersion slope at 1550 nm of between about ?0.36 and ?0.56 ps/nm2/km. The refractive index profile is preferably further selected to provide a kappa, defined as the total dispersion at 1550 nm divided by the dispersion slope at 1550 nm, of between about 250 and 320 nm. Optical transmission systems including the present invention dispersion compensating optical fiber which have residual dispersion less than +/?15 ps/nm per 100 km of standard single mode transmission fiber are also disclosed.Type: GrantFiled: September 24, 2003Date of Patent: August 2, 2005Assignee: Corning IncorporatedInventors: Peter G. Hebgen, Snigdharaj K. Mishra
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Patent number: 6904215Abstract: The present invention provides an optical fiber suitable for the manufacture of optical fiber couplers and having low macrobending loss, low cutoff wavelength, low attenuation, and low sensitivity to variations in overclad mass. One aspect of the present invention provides an optical fiber having a core having an index profile, the index profile of the core having a value of ? of between about 1.7 and about 3.0; and a cladding region surrounding and in contact with the core, the cladding region having an outer radius of at least about 40 ?m, wherein the optical fiber has a cutoff wavelength of between about 870 nm and about 970 nm, and a macrobending loss of below about 1 dB at a wavelength of 1550 nm when wrapped one turn around a 32 mm mandrel.Type: GrantFiled: May 23, 2003Date of Patent: June 7, 2005Assignee: Corning IncorporatedInventors: William R. Christoff, Kristina M. Jeric, David T. Marlowe, Snigdharaj K. Mishra
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Patent number: 6829422Abstract: Disclosed is a dispersion compensating and dispersion slope compensating single mode optical waveguide fiber. The refractive index profiles of waveguide fibers in accord with the invention are disclosed and described. These index profiles provide a waveguide fiber having negative total dispersion and negative total dispersion slope so that a standard waveguide fiber is compensated over an extended wavelength range. A telecommunications link using the fiber in accord with the invention is also disclosed and described. A standard fiber to compensating fiber length ratio in the range of 1:1 to 3:1 is shown to give optimum link performance with respect to limiting non-linear dispersion effects.Type: GrantFiled: January 30, 2003Date of Patent: December 7, 2004Assignee: Corning IncorporatedInventors: George E. Berkey, Scott R. Bickham, Michael B. Cain, Pamela A. Hajcak, Upendra H. Manyam, Snigdharaj K. Mishra, V. Srikant
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Publication number: 20040218882Abstract: An optical waveguide fiber having a high threshold for stimulated Brillouin scattering. The optical fiber preferably has large optical effective area, and further preferably has a low zero dispersion wavelength.Type: ApplicationFiled: April 5, 2004Publication date: November 4, 2004Inventors: Scott R. Bickham, Dipakbin Q. Chowdhury, Madison L. Howard, Shiva Kumar, Daiping Ma, Snigdharaj K. Mishra, A. Boh Ruffin, Sergey Y. Ten
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Patent number: 6760527Abstract: An optical waveguide fiber having a relatively large effective area which exhibits low attenuation, low PMD and low microbending sensitivity. A step-index refractive index profile is advantageously used.Type: GrantFiled: May 29, 2003Date of Patent: July 6, 2004Assignee: Corning IncorporatedInventors: George E. Berkey, Daiping Ma, Snigdharaj K. Mishra
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Patent number: 6701052Abstract: Disclosed is a dispersion compensating and dispersion slope compensating single mode optical waveguide fiber. The refractive index profiles of waveguide fibers in accord with the invention are disclosed and described. These index profiles provide a waveguide fiber having negative total dispersion and negative total dispersion slope so that a standard waveguide fiber is compensated over an extended wavelength range. A telecommunications link using the fiber in accord with the invention is also disclosed and described. A standard fiber to compensating fiber length ratio in the range of 1:1 to 3:1 is shown to give optimum link performance with respect to limiting non-linear dispersion effects.Type: GrantFiled: March 30, 2001Date of Patent: March 2, 2004Assignee: Corning IncorporatedInventors: George E. Berkey, Scott R. Bickham, Michael B. Cain, Pamela A. Hajcak, Upendra H. Manyam, Snigdharaj K. Mishra, V. Srikant
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Patent number: 6671445Abstract: Disclosed are refractive index profiles for total dispersion compensating optical waveguide fibers for use in high data rate, long length telecommunications systems. The optical waveguide fibers in accord with the invention provide substantially equal compensation of total dispersion over a range of wavelengths, thus facilitating wavelength division multiplexed systems. Also disclosed are spans of optical waveguide fiber that include a length of transmission fiber together with a length of the compensating fiber. The spans are joined end to end in series arrangement to form the optical waveguide fiber part of a telecommunication system.Type: GrantFiled: May 30, 2001Date of Patent: December 30, 2003Assignee: Corning IncorporatedInventors: Scott R. Bickham, Michael B. Cain, Shiva Kumar, Snigdharaj K. Mishra, V. Srikant, Jeffery S. Stone
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Publication number: 20030223716Abstract: The present invention provides an optical fiber suitable for the manufacture of optical fiber couplers and having low macrobending loss, low cutoff wavelength, low attenuation, and low sensitivity to variations in overclad mass. One aspect of the present invention provides an optical fiber having a core having an index profile, the index profile of the core having a value of &agr; of between about 1.7 and about 3.0; and a cladding region surrounding and in contact with the core, the cladding region having an outer radius of at least about 40 &mgr;m, wherein the optical fiber has a cutoff wavelength of between about 870 nm and about 970 nm, and a macrobending loss of below about 1 dB at a wavelength of 1550 nm when wrapped one turn around a 32 mm mandrel.Type: ApplicationFiled: May 23, 2003Publication date: December 4, 2003Inventors: William R. Christoff, Kristina M. Jeric, David T. Marlowe, Snigdharaj K. Mishra
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Publication number: 20030210877Abstract: An optical waveguide fiber having a relatively large effective area which exhibits low attenuation, low PMD and low microbending sensitivity. A step-index refractive index profile is advantageously used.Type: ApplicationFiled: May 29, 2003Publication date: November 13, 2003Inventors: George E. Berkey, Daiping Ma, Snigdharaj K. Mishra
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Patent number: 6611647Abstract: An optical waveguide fiber having a relatively large effective area which exhibits low attenuation, low PMD and low microbending sensitivity. A step-index refractive index profile is advantageously used.Type: GrantFiled: November 28, 2001Date of Patent: August 26, 2003Assignee: Corning IncorporatedInventors: George E. Berkey, Daiping Ma, Snigdharaj K. Mishra
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Publication number: 20030142941Abstract: Disclosed is a dispersion compensating and dispersion slope compensating single mode optical waveguide fiber. The refractive index profiles of waveguide fibers in accord with the invention are disclosed and described. These index profiles provide a waveguide fiber having negative total dispersion and negative total dispersion slope so that a standard waveguide fiber is compensated over an extended wavelength range. A telecommunications link using the fiber in accord with the invention is also disclosed and described. A standard fiber to compensating fiber length ratio in the range of 1:1 to 3:1 is shown to give optimum link performance with respect to limiting non-linear dispersion effects.Type: ApplicationFiled: January 30, 2003Publication date: July 31, 2003Inventors: George E. Berkey, Scott R. Bickham, Michael B. Cain, Pamela A. Hajcak, Upendra H. Manyam, Snigdharaj K. Mishra, V. Srikant
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Publication number: 20030086667Abstract: An optical waveguide fiber having a relatively large effective area which exhibits low attenuation, low PMD and low microbending sensitivity. A step-index refractive index profile is advantageously used.Type: ApplicationFiled: November 28, 2001Publication date: May 8, 2003Inventors: George E. Berkey, Daiping Ma, Snigdharaj K. Mishra
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Publication number: 20030021561Abstract: Disclosed is a dispersion compensating and dispersion slope compensating single mode optical waveguide fiber. The refractive index profiles of waveguide fibers in accord with the invention are disclosed and described. These index profiles provide a waveguide fiber having negative total dispersion and negative total dispersion slope so that a standard waveguide fiber is compensated over an extended wavelength range. A telecommunications link using the fiber in accord with the invention is also disclosed and described. A standard fiber to compensating fiber length ratio in the range of 1:1 to 3:1 is shown to give optimum link performance with respect to limiting non-linear dispersion effects.Type: ApplicationFiled: March 30, 2001Publication date: January 30, 2003Inventors: George E. Berkey, Scott R. Bickham, Michael B. Cain, Pamela A. Hajcak, Upendra H. Manyam, Snigdharaj K. Mishra, V. Srikant