Patents by Inventor Xiangdong Qiu
Xiangdong Qiu 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: 20140057356Abstract: The subject disclosure relates to matrix acidizing. More specifically, systems and methods are described for estimating a diffusion coefficient for an acid fluid used to stimulate a subterranean reservoir wherein a spent acid is formulated that includes one or more by-products of the reaction between the fluid and rock. A rock sample, such as in the form of a rotating disk is exposed to spent acid under elevated pressure and temperature conditions while the fluid is sampled and analyzed. A diffusion coefficient for the spend acid is estimated.Type: ApplicationFiled: August 21, 2013Publication date: February 27, 2014Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: XIANGDONG QIU, FRANK F. CHANG
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Patent number: 8475056Abstract: A fiber coupled semiconductor device having an improved optical stability with respect to temperature variation is disclosed. The stability improvement is achieved by placing the platform holding the semiconductor chip and the optical fiber onto a spacer mounted on a base. The spacer has an area smaller than the area of the platform, for mechanical decoupling of thermally induced deformation of the base from a deformation of the platform of the semiconductor device. Attaching the optical fiber to a vertical mounting surface of a fiber mount, and additionally attaching the fiber mount to a submount of the semiconductor chip further improves thermal stability of the packaged device.Type: GrantFiled: July 26, 2010Date of Patent: July 2, 2013Assignee: JDS Uniphase CorporationInventors: Prasad Yalamanchili, Xiangdong Qiu, Reddy Raju, Jay A. Skidmore, Michael Au, Laura Zavala, Richard L. Duesterberg
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Patent number: 8215850Abstract: A molded ceramic or glass ferrule has at least one longitudinal passage, which enables an optical fiber feed through, sealed into a metal housing with glass solder. The metal material in the housing has a slightly higher coefficient of thermal expansion (CTE) than the ferrule material and the sealing glass so that hermetic seal is maintained by a compression stress applied to the ferrule and sealing glass by the housing at operating conditions. When the housing has to be fabricated from a low CTE material, e.g. metal or ceramic, a metal sleeve and stress relief bracket is used to apply the compression stress.Type: GrantFiled: December 29, 2009Date of Patent: July 10, 2012Inventors: Prasad Yalamanchili, Xiangdong Qiu, Reddy Raju, Jihua Du
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Publication number: 20110158594Abstract: A molded ceramic or glass ferrule has at least one longitudinal passage, which enables an optical fiber feed through, sealed into a metal housing with glass solder. The metal material in the housing has a slightly higher coefficient of thermal expansion (CTE) than the ferrule material and the sealing glass so that hermetic seal is maintained by a compression stress applied to the ferrule and sealing glass by the housing at operating conditions. When the housing has to be fabricated from a low CTE material, e.g. metal or ceramic, a metal sleeve and stress relief bracket is used to apply the compression stress.Type: ApplicationFiled: December 29, 2009Publication date: June 30, 2011Applicants: JDS Uniphase CorporationInventors: Prasad YALAMANCHILI, Xiangdong Qiu, Reddy Raju, Jihua Du
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Publication number: 20110026877Abstract: A fiber coupled semiconductor device having an improved optical stability with respect to temperature variation is disclosed. The stability improvement is achieved by placing the platform holding the semiconductor chip and the optical fiber onto a spacer mounted on a base. The spacer has an area smaller than the area of the platform, for mechanical decoupling of thermally induced deformation of the base from a deformation of the platform of the semiconductor device. Attaching the optical fiber to a vertical mounting surface of a fiber mount, and additionally attaching the fiber mount to a submount of the semiconductor chip further improves thermal stability of the packaged device.Type: ApplicationFiled: July 26, 2010Publication date: February 3, 2011Inventors: Prasad YALAMANCHILI, Xiangdong QIU, Reddy RAJU, Jay A. SKIDMORE, Michael AU, Laura ZAVALA, Richard L. DUESTERBERG
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Publication number: 20110026558Abstract: A fiber coupled semiconductor device and a method of manufacturing of such a device are disclosed. The method provides an improved stability of optical coupling during assembly of the device, whereby a higher optical power levels and higher overall efficiency of the fiber coupled device can be achieved. The improvement is achieved by attaching the optical fiber to a vertical mounting surface of a fiber mount. The platform holding the semiconductor chip and the optical fiber can be mounted onto a spacer mounted on a base. The spacer has an area smaller than the area of the platform, for mechanical decoupling of thermally induced deformation of the base from a deformation of the platform of the semiconductor device. Optionally, attaching the fiber mount to a submount of the semiconductor chip further improves thermal stability of the packaged device.Type: ApplicationFiled: July 27, 2010Publication date: February 3, 2011Applicant: JDS Uniphase CorporationInventors: Reddy RAJU, Richard L. Duesterberg, Jay A. Skidmore, Prasad Yalamanchili, Xiangdong Qiu
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Patent number: 7668214Abstract: An apparatus for coupling radiation of individual laser diode emitters into a common optical fiber is disclosed. The radiation is collimated along fast axis and combined by using crossed pairs of flat mirrors. The combined beams are collimated by a common slow axis collimating lens. The laser diode emitters are disposed on both sides of an optical axis of the slow axis collimating lens such that the optical path lengths from the emitters to the slow axis collimating lens are equal.Type: GrantFiled: May 7, 2008Date of Patent: February 23, 2010Assignee: JDS Uniphase CorporationInventors: Gordon Wilson, Xiangdong Qiu, YuZhong Dai
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Publication number: 20080310027Abstract: An apparatus for coupling radiation of individual laser diode emitters into a common optical fiber is disclosed. The radiation is collimated along fast axis and combined by using crossed pairs of flat mirrors. The combined beams are collimated by a common slow axis collimating lens. The laser diode emitters are disposed on both sides of an optical axis of the slow axis collimating lens such that the optical path lengths from the emitters to the slow axis collimating lens are equal.Type: ApplicationFiled: May 7, 2008Publication date: December 18, 2008Applicant: JDS Uniphase CorporationInventors: Gordon Wilson, Xiangdong Qiu, YuZhong Dai
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Patent number: 7130121Abstract: An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section connected to the amplifying erbium-doped optical fiber section. The fiber section is formed from an optical fiber which better matches the transmission modes in the erbium-doped optical fiber section and has an end subsection of the single mode fiber for a larger numerical aperture. Collimating lenses also increase the coupling efficiency of the laser diode to the erbium-doped fiber section. The integrated output module has a photodiode with a tap filter to monitor the output power of the EDFA, an optical isolator to prevent interference in the erbium-doped optical fiber section. With a twin optical isolator, the integrated input and output modules can be arranged in different ways and combinations with the erbium-doped optical fiber section.Type: GrantFiled: March 20, 2006Date of Patent: October 31, 2006Assignee: Lightwaves 2020, Inc.Inventors: Jing-Jong Pan, Xiangdong Qiu, Kejian Guan, Mingjie Zhang
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Publication number: 20060158718Abstract: An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section connected to the amplifying erbium-doped optical fiber section. The fiber section is formed from an optical fiber which better matches the transmission modes in the erbium-doped optical fiber section and has an end subsection of the single mode fiber for a larger numerical aperture. Collimating lenses also increase the coupling efficiency of the laser diode to the erbium-doped fiber section. The integrated output module has a photodiode with a tap filter to monitor the output power of the EDFA, an optical isolator to prevent interference in the erbium-doped optical fiber section. With a twin optical isolator, the integrated input and output modules can be arranged in different ways and combinations with the erbium-doped optical fiber section.Type: ApplicationFiled: March 20, 2006Publication date: July 20, 2006Applicant: Lightwaves 2020, Inc.Inventors: Jing-Jong Pan, Xiangdong Qiu, Kejian Guan, Mingjie Zhang
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Patent number: 7044660Abstract: An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section connected to the amplifying erbium-doped optical fiber section. The fiber section is formed from an optical fiber which better matches the transmission modes in the erbium-doped optical fiber section and has an end subsection of the single mode fiber for a larger numerical aperture. Collimating lenses also increase the coupling efficiency of the laser diode to the erbium-doped fiber section. The integrated output module has a photodiode with a tap filter to monitor the output power of the EDFA, an optical isolator to prevent interference in the erbium-doped optical fiber section. With a twin optical isolator, the integrated input and output modules can be arranged in different ways and combinations with the erbium-doped optical fiber section.Type: GrantFiled: July 21, 2005Date of Patent: May 16, 2006Assignee: Lightwaves 2020, Inc.Inventors: Jing-Jong Pan, Xiangdong Qiu, Kejian Guan, Mingjie Zhang
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Publication number: 20050280888Abstract: An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section connected to the amplifying erbium-doped optical fiber section. The fiber section is formed from an optical fiber which better matches the transmission modes in the erbium-doped optical fiber section and has an end subsection of the single mode fiber for a larger numerical aperture. Collimating lenses also increase the coupling efficiency of the laser diode to the erbium-doped fiber section. The integrated output module has a photodiode with a tap filter to monitor the output power of the EDFA, an optical isolator to prevent interference in the erbium-doped optical fiber section. With a twin optical isolator, the integrated input and output modules can be arranged in different ways and combinations with the erbium-doped optical fiber section.Type: ApplicationFiled: July 21, 2005Publication date: December 22, 2005Inventors: Jing-Jong Pan, Xiangdong Qiu, Kejian Guan, Mingjie Zhang
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Patent number: 6922281Abstract: An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section connected to the amplifying erbium-doped optical fiber section. The fiber section is formed from an optical fiber which better matches the transmission modes in the erbium-doped optical fiber section and has an end subsection of the single mode fiber for a larger numerical aperture. Collimating lenses also increase the coupling efficiency of the laser diode to the erbium-doped fiber section. The integrated output module has a photodiode with a tap filter to monitor the output power of the EDFA, an optical isolator to prevent interference in the erbium-doped optical fiber section. With a twin optical isolator, the integrated input and output modules can be arranged in different ways and combinations with the erbium-doped optical fiber section.Type: GrantFiled: May 3, 2002Date of Patent: July 26, 2005Assignee: Lightwaves 2020, Inc.Inventors: Jing-Jong Pan, Xiangdong Qiu, Kejian Guan, Mingjie Zhang
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Patent number: 6801183Abstract: A temperature compensation circuit arrangement for liquid crystal cells in optical devices is presented. In an optical device, a liquid crystal cell typically manipulates the optical signals according to an output optical property, such as attenuation, responsive to an AC voltage source electrical signal. A feedback circuit arrangement is connected to the liquid crystal cell and controls the current through the liquid crystal cell with respect to temperature by a predetermined control equations for the output optical property so that the device manipulates the optical signals independently of temperature. The current follows the control equations, which are empirically determined with respect to temperature for one equation.Type: GrantFiled: April 10, 2002Date of Patent: October 5, 2004Assignee: Lightwaves 2020, Inc.Inventors: Jing-Jong Pan, Xiangdong Qiu, Hai-Ming Wu
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Publication number: 20030206335Abstract: An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section connected to the amplifying erbium-doped optical fiber section. The fiber section is formed from an optical fiber which better matches the transmission modes in the erbium-doped optical fiber section and has an end subsection of the single mode fiber for a larger numerical aperture. Collimating lenses also increase the coupling efficiency of the laser diode to the erbium-doped fiber section. The integrated output module has a photodiode with a tap filter to monitor the output power of the EDFA, an optical isolator to prevent interference in the erbium-doped optical fiber section. With a twin optical isolator, the integrated input and output modules can be arranged in different ways and combinations with the erbium-doped optical fiber section.Type: ApplicationFiled: May 3, 2002Publication date: November 6, 2003Applicant: Lightwaves 2020, Inc.Inventors: Jing-Jong Pan, Xiangdong Qiu, Kejian Guan, Mingjie Zhang
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Publication number: 20030128986Abstract: The invention relates to an add/drop multiplexer utilizing at least two stages of wavelength interleaver technology to provide high isolation, while dropping and adding subsets of periodically spaced wavelength channels. The primary function is to separate a first subset of periodically spaced wavelength channels, e.g. even ITU channels, from an input signal, and then to combine the remaining channels, e.g. odd ITU channels, with another subset of channels having the same center wavelengths as the separated channels. The separation and combination are conducted in separate wavelength interleavers providing two stages of filtering to the output signals. Any form of wavelength interleaver is useable in the present invention, including multi-cavity etalon interleavers, Michelson Gires-Tournois interleavers, birefringent crystal interleavers, and birefringent Michelson Gires-Tournois interleavers.Type: ApplicationFiled: December 18, 2002Publication date: July 10, 2003Applicant: JDS Uniphase CorporationInventors: Kuochou Tai, Xiangdong Qiu