Patents by Inventor Prasad Yalamanchili
Prasad Yalamanchili 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: 20240134128Abstract: An optical device may include an optical fiber, a solder material, and a fibermount comprising a non-porous material. The optical fiber may be affixed to the fibermount by the solder material. The non-porous material of the fibermount may have a thermal conductivity of less than 20 Watts per meter-Kelvin (W/m-K). A coefficient of thermal expansion (CTE) of the non-porous material of the fibermount may match a CTE of the solder material. The CTE of the non-porous material of the fibermount may match a CTE of a material of the optical fiber.Type: ApplicationFiled: January 13, 2023Publication date: April 25, 2024Inventors: Zhengwei SHI, Jihua DU, Prasad YALAMANCHILI
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Publication number: 20230178966Abstract: A laser module includes a laser submodule, a polarization beam combiner (PBC), a beam rotator, a grating, and an output fiber (e.g., each disposed on an internal surface of a floor of the laser module). The laser submodule is configured to emit an array pattern of beams, which the PBC is configured to combine into a vertical stack pattern of beams, which the beam rotator is configured to rotate into a horizontal stack pattern of beams, which the grating is configured to combine into an overlapped pattern of beams, which the output fiber is configured to emit. The vertical stack pattern of beams, the horizontal stack pattern of beams, and the overlapped pattern of beams are to transmit through the laser module parallel to a single common plane (e.g., that is parallel to the internal surface of the floor of the laser module).Type: ApplicationFiled: December 7, 2022Publication date: June 8, 2023Inventors: Cailin WEI, John G. BAI, Jihua DU, Prasad YALAMANCHILI, Victor ROSSIN
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Patent number: 11467357Abstract: In some implementations, an emitter module may include an emitter array that includes multiple emitters, and an optical fiber that includes multiple cores within a single cladding. The emitter array may be optically coupled to a tip of the optical fiber such that each emitter, of the multiple emitters of the emitter array, is optically coupled to a respective core of the multiple cores of the optical fiber. The optical fiber may include an integral lens at the tip of the optical fiber. The integral lens at the tip of the optical fiber may be in alignment with the multiple cores of the optical fiber.Type: GrantFiled: February 19, 2021Date of Patent: October 11, 2022Assignee: Lumentum Operations LLCInventors: Cailin Wei, Jihua Du, Prasad Yalamanchili
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Publication number: 20220196932Abstract: In some implementations, an emitter module may include an emitter array that includes multiple emitters, and an optical fiber that includes multiple cores within a single cladding. The emitter array may be optically coupled to a tip of the optical fiber such that each emitter, of the multiple emitters of the emitter array, is optically coupled to a respective core of the multiple cores of the optical fiber. The optical fiber may include an integral lens at the tip of the optical fiber. The integral lens at the tip of the optical fiber may be in alignment with the multiple cores of the optical fiber.Type: ApplicationFiled: February 19, 2021Publication date: June 23, 2022Inventors: Cailin WEI, Jihua DU, Prasad YALAMANCHILI
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Patent number: 10962726Abstract: A fiber attachment structure may comprise a monolithic platform structure having a first trench and a second trench to segment the monolithic platform structure into a chip mount area, a first island, and a second island. A laser chip may be mounted directly on the chip mount area and an optical fiber may be mounted on the first island by a first adhesive joint and on the second island by a second adhesive joint. For example, in some implementations, the first adhesive joint may include a first quantity of adhesive material attaching the optical fiber to the first island at a position at which a tip of the optical fiber is aligned with an output facet of the laser chip, and the second adhesive joint may include a second quantity of the adhesive material to mechanically secure the optical fiber to the second island.Type: GrantFiled: December 2, 2019Date of Patent: March 30, 2021Assignee: Lumentum Operations LLCInventors: Frank Wu, Prasad Yalamanchili, Raman Srinivasan, Huijie Xu
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Publication number: 20210063657Abstract: A fiber attachment structure may comprise a monolithic platform structure having a first trench and a second trench to segment the monolithic platform structure into a chip mount area, a first island, and a second island. A laser chip may be mounted directly on the chip mount area and an optical fiber may be mounted on the first island by a first adhesive joint and on the second island by a second adhesive joint. For example, in some implementations, the first adhesive joint may include a first quantity of adhesive material attaching the optical fiber to the first island at a position at which a tip of the optical fiber is aligned with an output facet of the laser chip, and the second adhesive joint may include a second quantity of the adhesive material to mechanically secure the optical fiber to the second island.Type: ApplicationFiled: December 2, 2019Publication date: March 4, 2021Inventors: Frank WU, Prasad YALAMANCHILI, Raman SRINIVASAN, Huijie XU
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Patent number: 10763639Abstract: A device may include a lead-frame including a first electrode and a second electrode, a carrier, a set of optical devices mechanically and electrically connected to the first electrode, and a set of electrical connections that electrically connects the second electrode to the set of optical devices. The lead-frame and the carrier may be mechanically connected to each other via a set of interlocking structures associated with the lead-frame and the carrier. The lead-frame and the set of optical devices may have matching coefficients of thermal expansion. The first electrode and the second electrode may be electrically isolated from each other.Type: GrantFiled: January 22, 2019Date of Patent: September 1, 2020Assignee: Lumentum Operations LLCInventors: Kong Weng Lee, Vincent V. Wong, Jay A. Skidmore, Prasad Yalamanchili, Gity Samadi, Raman Srinivasan, Yongfeng Guan, Slava Khassine
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Publication number: 20190252849Abstract: A device may comprise a lead-frame comprising a first electrode and a second electrode, a carrier, a set of optical devices mechanically and electrically connected to the first electrode, and a set of electrical connections that electrically connects the second electrode to the set of optical devices. The lead-frame and the carrier may be mechanically connected to each other via a set of interlocking structures associated with the lead-frame and the carrier. The lead-frame and the set of optical devices may have matching coefficients of thermal expansion. The first electrode and the second electrode may be electrically isolated from each other.Type: ApplicationFiled: January 22, 2019Publication date: August 15, 2019Inventors: Kong Weng Lee, Vincent V. Wong, Jay A. Skidmore, Prasad Yalamanchili, Gity Samadi, Raman Srinivasan, Yongfeng Guan, Slava Khassine
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Patent number: 9036678Abstract: 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: GrantFiled: July 27, 2010Date of Patent: May 19, 2015Assignee: JDS Uniphase CorporationInventors: Reddy Raju, Richard L. Duesterberg, Jay A. Skidmore, Prasad Yalamanchili, Xiangdong Qiu
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Patent number: 9008139Abstract: A high field of view, low height package and wafer-level packaging process are provided. The top surface of a first wafer has recesses defined by sidewalls, with a reflector, and a floor. The reflector is incident a horizontal light path form an edge-emitting diode on the floor, directing the light path vertically. A second optically diffusing wafer receives the vertically directed light. A vertical ring to surround each recess is wafer-level fabricated on one of the wafers. The vertical ring may have a high aspect ratio to increase light diffusion. The second wafer is connected above the first such that each vertical ring encloses its corresponding recess and such that the light vertically exits the optically diffusing media after spanning the height of the vertical ring. Diode electrical connections are provided for externally controlling the diode. Individual packages are separated by double-dicing the connected wafers between the recesses.Type: GrantFiled: June 28, 2013Date of Patent: April 14, 2015Assignee: JDS Uniphase CorporationInventors: Pezhman Monadgemi, Vincent V. Wong, Prasad Yalamanchili, Reddy Raju, Erik Paul Zucker, Jay A. Skidmore
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Publication number: 20150003482Abstract: A high field of view, low height package and wafer-level packaging process are provided. The top surface of a first wafer has recesses defined by sidewalls, with a reflector, and a floor. The reflector is incident a horizontal light path form an edge-emitting diode on the floor, directing the light path vertically. A second optically diffusing wafer receives the vertically directed light. A vertical ring to surround each recess is wafer-level fabricated on one of the wafers. The vertical ring may have a high aspect ratio to increase light diffusion. The second wafer is connected above the first such that each vertical ring encloses its corresponding recess and such that the light vertically exits the optically diffusing media after spanning the height of the vertical ring. Diode electrical connections are provided for externally controlling the diode. Individual packages are separated by double-dicing the connected wafers between the recesses.Type: ApplicationFiled: June 28, 2013Publication date: January 1, 2015Applicant: JDS Uniphase CorporationInventors: Pezhman MONADGEMI, Vincent V. WONG, Prasad YALAMANCHILI, Reddy RAJU, Erik Paul ZUCKER, Jay A. SKIDMORE
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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: 6969205Abstract: A fiber tail assembly (FTA) with a micro-lens formed in the fiber tip is used to couple the laser light out of the package and along the fiber. The FTA is soldered at two points where metallized bands are deposited on the fiber pigtail, one at a fiber mount near the diode where it can be soldered into alignment with the laser diode, and two at the snout which forms a feed through the housing and seal for the package. Typically, the FTA is metallized along its entire length within the package. In this invention the two-metallized bands are separated by a region that is unmetallized.Type: GrantFiled: December 4, 2003Date of Patent: November 29, 2005Assignee: JDS Uniphase CorporationInventors: Richard L. Duesterberg, Edmund L. Wolak, Marc K. Von Gunten, Nina Morozova, Donald C. Hargreaves, Prasad Yalamanchili, Hilary Clarke, Jay A. Skidmore, Lei Xu, Christopher L. Hart, William Bardy, Jeffrey Zack, Kuochou Tai
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Publication number: 20050074217Abstract: A fiber tail assembly (FTA) with a micro-lens formed in the fiber tip is used to couple the laser light out of the package and along the fiber. The FTA is soldered at two points where metallized bands are deposited on the fiber pigtail, one at a fiber mount near the diode where it can be soldered into alignment with the laser diode, and two at the snout which forms a feed through the housing and seal for the package. Typically, the FTA is metallized along its entire length within the package. In this invention the two-metallized bands are separated by a region that is unmetallized.Type: ApplicationFiled: December 4, 2003Publication date: April 7, 2005Applicant: JDS Uniphase CorporationInventors: Richard Duesterberg, Edmund Wolak, Marc Gunten, Nina Morozova, Donald Hargreaves, Prasad Yalamanchili, Hilary Clarke, Jay Skidmore, Lei Xu, Christopher Hart, William Bardy, Jeffrey Zack, Kuochou Tai