Patents by Inventor Siu-Ping Hong
Siu-Ping Hong 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: 7946133Abstract: Methods for modifying preform core ovality during and subsequent to the formation of an optical fiber preform. After MCVD deposition forms the core rod, but prior to overcladding of the core rod, the code rod may be etched to change its ovality. In order to etch the core rod, the core rod may be mounted to lathe, rotated by at least two rotors, and subjected to a heat source. Additionally, one of the at least two rotors may be phase-shifted from another one of the at least two rotors after the core rod is mounted on the lathe.Type: GrantFiled: November 12, 2010Date of Patent: May 24, 2011Assignee: Fitel USA Corp.Inventors: James William Fleming, Siu-Ping Hong, Paul Francis Glodis, Thomas John Miller, Zhi Zhou, David Kalish, Shunhe Xiong
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Publication number: 20110056245Abstract: Methods for modifying preform core ovality during and subsequent to the formation of an optical fiber preform. After MCVD deposition forms the core rod, but prior to overcladding of the core rod, the code rod may be etched to change its ovality. In order to etch the core rod, the core rod may be mounted to lathe, rotated by at least two rotors, and subjected to a heat source. Additionally, one of the at least two rotors may be phase-shifted from another one of the at least two rotors after the core rod is mounted on the lathe.Type: ApplicationFiled: November 12, 2010Publication date: March 10, 2011Applicant: FITEL USA CORP.Inventors: James William Fleming, Siu-Ping Hong, Paul Francis Glodis, Thomas John Miller, Zhi Zhou, David Kalish, Shunhe Xiong
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Patent number: 7536877Abstract: An expeditious method for introducing geometric perturbations into lightguide during fabrication offers a perturbation stream of amplitude and periodicity—constant or varying—to satisfy a variety of needs.Type: GrantFiled: April 4, 2003Date of Patent: May 26, 2009Assignee: Fitel USH Corp.Inventors: Siu-Ping Hong, Steven Alan Jacobs, David Kalish, Albert John Ritger, Ian A. White
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Publication number: 20070125127Abstract: Methods for modifying preform core ovality during and subsequent to the formation of an optical fiber preform. After MCVD deposition forms the core rod, but prior to overcladding of the core rod, the code rod may be etched to change its ovality. In order to etch the core rod, the core rod may be mounted to lathe, rotated by at least two rotors, and subjected to a heat source. Additionally, one of the at least two rotors may be phase-shifted from another one of the at least two rotors after the core rod is mounted on the lathe.Type: ApplicationFiled: February 8, 2007Publication date: June 7, 2007Applicant: FITEL USA CORP.Inventors: James Fleming, Siu-Ping Hong, Paul Glodis, Thomas Miller, Zhi Zhou, David Kalish, Shunhe Xiong
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Patent number: 7035525Abstract: Methods and apparatuses negate a measured mechanical twist of an optical fiber by introducing a counteracting twist to bring the net mechanical twist closer to zero, which reduces the fiber's polarization mode dispersion (PMD). A spool of optical fiber having undesirable mechanical twist is mounted and fiber is drawn from the end of the spool to impart a specified counteracting mechanical twist. Additionally, the spool may be controllably rotated by a control system while optical fiber is drawn there from, allowing the system to generate a precise amount of counteracting mechanical twist in the fiber.Type: GrantFiled: September 26, 2002Date of Patent: April 25, 2006Assignee: Fitel USA Corp.Inventors: Gene Kent Weeks, Stephen Mast, Zhi Zhou, John F. Ryan, III, Harry Douglas Garner, Jr., Siu-Ping Hong, John Popwell, Alan H. McCurdy
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Patent number: 7001466Abstract: Systems and methods are disclosed for an automatic and continuous supply of coating material to a coating applicator in optical fiber fabrication. The present invention switches from one coating reservoir to another by way of a transitional period in which both coating reservoirs are supplying coating material to the coating applicator. For example, while an in-use reservoir is supplying the coating material to the coating applicator, a standby reservoir is being filled, settled to off gas air bubbles and then slowly pressurized. A sized orifice is used to slowly bleed off pressure from the in-use reservoir at a rate that does not allow the pressure in the in-use reservoir from falling out of a desired pressure range.Type: GrantFiled: December 20, 2002Date of Patent: February 21, 2006Assignee: Fitel USA Corp.Inventors: Siu-Ping Hong, Jason W. Shiroishi, James A. Hudson
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Patent number: 6923023Abstract: Methods and apparatuses estimate and control optical fiber primary coating diameter for wet-on-wet optical fiber manufacturing. The primary coating diameter for a particular length of optical fiber is calculated based upon a measurement of the weight of primary and/or secondary coating material consumed during optical fiber manufacturing. Control of the primary coating diameter is effected by a coating controller which can increase or decrease the primary coating diameter through control of glass temperature, coating viscosity and/or other parameters during wet-on-wet fiber manufacture.Type: GrantFiled: October 1, 2002Date of Patent: August 2, 2005Assignee: Fitel U.S.A. CorporationInventors: Siu-Ping Hong, Jason W. Shiroishi, Nirupama Kenkare
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Publication number: 20040221617Abstract: Methods for modifying preform core ovality during and subsequent to the formation of an optical fiber preform. Prior to MCVD deposition on a starting tube, the outer diameter of the starting tube is altered by etching or a like process to modify its ovality. Additionally, after MCVD deposition forms the core rod, but prior to overcladding of the core rod, the code rod may be etched to change its ovality. Both methods may be used independently or in combination to modify the ovality and reduce PMD of optical fiber drawn from the core rod. An additional method includes etching the cladding material of a core rod having an oval or elliptical core such that the cladding material mirrors the shape of the oval core. During drawing, the perform created there from is placed under a surface tension, or pulled in a manner to generate a circular or near perfect circular optical fiber having desired ovality and low PMD.Type: ApplicationFiled: May 5, 2003Publication date: November 11, 2004Inventors: James William Fleming, Siu-Ping Hong, Paul Francis Glodis, Thomas John Miller, Zhi Zhou, David Kalish, Shunhe Xiong
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Publication number: 20040194512Abstract: An expeditious method for introducing geometric perturbations into lightguide during fabrication offers a perturbation stream of amplitude and periodicity—constant or varying—to satisfy a variety of needs.Type: ApplicationFiled: April 4, 2003Publication date: October 7, 2004Inventors: Siu-Ping Hong, Steven Alan Jacobs, David Kalish, Albert John Ritger, Ian A. White
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Publication number: 20040139766Abstract: Systems and methods for treating spools of fiber using recycled gas. Spools of fiber are placed in chambers which can be sealed for exposure to the treatment gas. When a chamber is closed and sealed the treatment gas is pumped into the chamber to a specified pressure temperature and pressure to react with the fiber. Upon completion of the reaction the gas is pumped from the chamber in order to facilitate the removal of the treated fiber. The gas can be evacuated with a vacuum pump and compressed to be stored in a pressure vessel for reuse. At this time the gas may be analyzed. If the concentration of a component is too low, the gas may be vented or it may be enriched so that it may be recycled; otherwise it is compressed for storage and the process is repeated.Type: ApplicationFiled: January 17, 2003Publication date: July 22, 2004Inventors: Gene K. Weeks, Junjun Wu, Ramdane Assas, Kai H. Chang, Siu-Ping Hong
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Publication number: 20040120671Abstract: Systems and methods are disclosed for an automatic and continuous supply of coating material to a coating applicator in optical fiber fabrication. The present invention switches from one coating reservoir to another by way of a transitional period in which both coating reservoirs are supplying coating material to the coating applicator. For example, while an in-use reservoir is supplying the coating material to the coating applicator, a standby reservoir is being filled, settled to off gas air bubbles and then slowly pressurized. A sized orifice is used to slowly bleed off pressure from the in-use reservoir at a rate that does not allow the pressure in the in-use reservoir from falling out of a desired pressure range.Type: ApplicationFiled: December 20, 2002Publication date: June 24, 2004Inventors: Siu-Ping Hong, Jason W. Shiroishi, James A. Hudson
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Patent number: 6717659Abstract: Defects in optical fibers are detected during manufacturing by using three bandpass filters to separate signals from a scattered light signal produced by a light source in a fiber measurement system. The separated signals include a clad diameter signal, a regular airline signal and a core airline signal. The regular airline signal is compared with the clad diameter signal to produce a normalized regular airline signal, and the core airline signal is compared with the clad diameter signal to produce a normalized core airline signal. The normalized regular airline signal and normalized core airline signal are monitored to determine if they increase, which indicates the presence of a defect in the optical fiber.Type: GrantFiled: June 14, 2002Date of Patent: April 6, 2004Assignee: Fitel USA Corp.Inventors: Haiying Huang, James Hudson, Siu-Ping Hong, Ronald Lamar Adams
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Publication number: 20040062514Abstract: Methods and apparatuses negate a measured mechanical twist of an optical fiber by introducing a counteracting twist to bring the net mechanical twist closer to zero, which reduces the fiber's polarization mode dispersion (PMD). A spool of optical fiber having undesirable mechanical twist is mounted and fiber is drawn from the end of the spool to impart a specified counteracting mechanical twist. Additionally, the spool may be controllably rotated by a control system while optical fiber is drawn there from, allowing the system to generate a precise amount of counteracting mechanical twist in the fiber.Type: ApplicationFiled: September 26, 2002Publication date: April 1, 2004Applicant: Fitel USA Corp.Inventors: Gene Kent Weeks, Stephen Mast, Zhi Zhou, John F. Ryan, Harry Douglas Garner, Siu-Ping Hong, John Popwell, Alan H. McCurdy
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Publication number: 20040062515Abstract: Methods and apparatuses introduce mechanical twist to an optical fiber having relatively large polarization mode dispersion (PMD), such as unspun fiber or fiber spun with constant spatial frequency, which mechanical twist reduces the fiber's PMD. A spool of optical fiber having relatively large PMD is mounted and fiber is pulled from the end of the spool to impart a specified mechanical twist. Additionally, the spool may be controllably rotated by a control system while optical fiber is pulled therefrom, allowing the system to generate a precise amount of mechanical twist to the fiber. Also, it is possible to measure the amount of mechanical twist in an optical fiber and the amount of mechanical twist in an optical fiber as a function of fiber length.Type: ApplicationFiled: May 1, 2003Publication date: April 1, 2004Inventors: Harry Douglas Garner, Siu-Ping Hong, James A. Hudson, David Kalish, Stephen Mast, Alan H. McCurdy, John Popwell, John F. Ryan, Gene Kent Weeks, Zhi Zhou
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Publication number: 20040060323Abstract: Methods and apparatuses estimate and control optical fiber primary coating diameter for wet-on-wet optical fiber manufacturing. The primary coating diameter for a particular length of optical fiber is calculated based upon a measurement of the weight of primary and/or secondary coating material consumed during optical fiber manufacturing. Control of the primary coating diameter is effected by a coating controller which can increase or decrease the primary coating diameter through control of glass temperature, coating viscosity and/or other parameters during wet-on-wet fiber manufacture.Type: ApplicationFiled: October 1, 2002Publication date: April 1, 2004Applicant: Fitel U.S.A. Corp.Inventors: Siu-Ping Hong, Jason W. Shiroishi, Nirupama Kenkare
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Patent number: 6701753Abstract: Embodiments of the invention include a method and apparatus for making optical fiber preforms and optical fiber. The method includes the steps of positioning an overclad tube around a preform core rod, heating the overclad tube along the length thereof in the presence of a pressure gradient to collapse onto the preform core to form the overclad optical fiber preform, and adjusting the radial size of a heated portion of the preform core rod and/or the overclad tube to actively match the radial dimensions of the preform core rod along the length thereof with corresponding portions of the overclad tube. The active matching reduces variations in the physical dimensions of the preform core rod and/or the overclad tube, which improves transmission and other performance characteristics of fiber drawn from the created preform, e.g., by maintaining a relatively constant D/d ratio of the preform.Type: GrantFiled: February 11, 2001Date of Patent: March 9, 2004Assignee: Fitel USA Corp.Inventors: Xiaoyuan Dong, Siu-Ping Hong
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Publication number: 20030231296Abstract: Defects in optical fibers are detected during manufacturing by using three bandpass filters to separate signals from a scattered light signal produced by a light source in a fiber measurement system. The separated signals include a clad diameter signal, a regular airline signal and a core airline signal. The regular airline signal is compared with the clad diameter signal to produce a normalized regular airline signal, and the core airline signal is compared with the clad diameter signal to produce a normalized core airline signal. The normalized regular airline signal and normalized core airline signal are monitored to determine if they increase, which indicates the presence of a defect in the optical fiber.Type: ApplicationFiled: June 14, 2002Publication date: December 18, 2003Inventors: Haiying Huang, James Hudson, Siu-Ping Hong, Ronald Lamar Adams
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Patent number: 6460378Abstract: Embodiments of the invention include a method and apparatus for making a multiple overclad optical fiber preform. The method includes positioning a first overclad tube around a preform core rod, positioning at least one second overclad tube around the first overclad tube, and collectively heating the preform core and the overclad tubes under pressure to collapse the overclad tubes onto the preform core rod thus producing a multiple overclad optical fiber preform. The apparatus includes a preform core rod, a first overclad tube surrounding the preform core rod, and at least one second overclad tube surrounding the first overclad tube. A quartz disc with or without one or more quartz spacers is used for supporting the preform core rod and the first overclad tube within the additional overclad tubes.Type: GrantFiled: February 29, 2000Date of Patent: October 8, 2002Inventors: Xiaoyuan Dong, Siu-Ping Hong, Thomas John Miller, Don H Smith
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Publication number: 20020108403Abstract: Embodiments of the invention include a method and apparatus for making optical fiber preforms and optical fiber. The method includes the steps of positioning an overclad tube around a preform core rod, heating the overclad tube along the length thereof in the presence of a pressure gradient to collapse onto the preform core to form the overclad optical fiber preform, and adjusting the radial size of a heated portion of the preform core rod and/or the overclad tube to actively match the radial dimensions of the preform core rod along the length thereof with corresponding portions of the overclad tube. The active matching reduces variations in the physical dimensions of the preform core rod and/or the overclad tube, which improves transmission and other performance characteristics of fiber drawn from the created preform, e.g., by maintaining a relatively constant D/d ratio of the preform.Type: ApplicationFiled: February 11, 2001Publication date: August 15, 2002Inventors: Xiaoyuan Dong, Siu-Ping Hong
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Patent number: 6260386Abstract: Glass preforms are cleaned by contacting each preform (11) with supercritical carbon dioxide which dissolves residual index-matching oil on the preform. The liquefied carbon dioxide is then converted to gaseous carbon dioxide which conveniently separates the index-matching oil so that it can be recovered and reused. The gaseous carbon dioxide is likewise recycled for use in cleaning other preforms, and so there is substantially no waste.Type: GrantFiled: March 10, 1994Date of Patent: July 17, 2001Assignee: Lucent Technologies Inc.Inventors: Jeffrey Jonathan Evans, Siu-Ping Hong, Urmi Ray, Trudy Murrell Thiele