Patents by Inventor Farnaz Parhami
Farnaz Parhami 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: 8988440Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for a display with inactive dummy pixels. A display apparatus may include subpixels having a first electrode layer and a second electrode layer. The first electrode layer of an edge subpixel may include an opening, which may be made large enough to prevent the edge subpixel from actuating. The size of the openings also may be selected to attain a desired overall reflectivity for an array of edge subpixels. For example, the size of the openings may be selected to make the reflectivity of an edge pixel array similar to the reflectivity of a routing area.Type: GrantFiled: December 19, 2011Date of Patent: March 24, 2015Assignee: QUALCOMM MEMS Technologies, Inc.Inventors: Koorosh Aflatooni, Farnaz Parhami, Suryaprakash Ganti
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Publication number: 20120274666Abstract: This disclosure provides systems, methods and apparatuses, including computer programs encoded on computer-readable storage media, for calibrating a display. In one aspect, a method of calibrating a display includes determining one or more array voltages and, based on the determined array voltages, determining one or more drive scheme voltages. The determined drive scheme voltages may include, for example, a single segment voltage applied to all of the display elements of the array, and multiple common voltages applies to multiple subsets of the display elements of the array.Type: ApplicationFiled: October 21, 2011Publication date: November 1, 2012Applicant: QUALCOMM MEMS Technologies, Inc.Inventors: Koorosh Aflatooni, Tao Yu, Court A. Arning, Farnaz Parhami, Nathaniel R. Bennett
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Publication number: 20120236009Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for a display with inactive dummy pixels. A display apparatus may include subpixels having a first electrode layer and a second electrode layer. The first electrode layer of an edge subpixel may include an opening, which may be made large enough to prevent the edge subpixel from actuating. The size of the openings also may be selected to attain a desired overall reflectivity for an array of edge subpixels. For example, the size of the openings may be selected to make the reflectivity of an edge pixel array similar to the reflectivity of a routing area.Type: ApplicationFiled: December 19, 2011Publication date: September 20, 2012Applicant: QUALCOMM MEMS TECHNOLOGIES, INC.Inventors: Koorosh Aflatooni, Farnaz Parhami, Suryaprakash Ganti
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Patent number: 8093719Abstract: In one embodiment, an integrated circuit device includes an active area encompassed by a seal ring. The seal ring may include a deep moat formed on an outer edge of the seal ring. The deep moat may have a depth that extends substantially to the substrate to prevent cracks from propagating into the active area. Alternatively or in addition, the seal ring may include redundant vias.Type: GrantFiled: November 16, 2005Date of Patent: January 10, 2012Assignee: Cypress Semiconductor CorporationInventor: Farnaz Parhami
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Patent number: 7609917Abstract: A method and apparatus for controlling waveguide birefringence by selection of a waveguide core width for a tuned top clad is described herein. In one example, a dopant concentration within a top cladding material is between 3-6% (wt.). Given a tuned top cladding composition, a width of the waveguide core is pre-selected such that birefringence is minimized, i.e., a zero, or near zero. The desirable width of the waveguide core is determined by calculating the distribution of stress in the top cladding over a change in temperature. From this distribution of stress, a relationship between the polarization dependent wavelength and variable widths of the waveguide in the arrayed waveguide grating are determined. This relationship determines a zero value, or near zero value, of polarization dependent wavelength for a given range of waveguide widths. Accordingly, the width of the waveguide may be selected such that the polarization dependent wavelength is minimized.Type: GrantFiled: March 28, 2008Date of Patent: October 27, 2009Assignee: Lightwave Microsystems CorporationInventors: Farnaz Parhami, Liang Zhao, Fan Zhong
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Publication number: 20080240655Abstract: A method and apparatus for controlling waveguide birefringence by selection of a waveguide core width for a tuned top clad is described herein. In one example, a dopant concentration within a top cladding material is between 3-6% (wt.). Given a tuned top cladding composition, a width of the waveguide core is pre-selected such that birefringence is minimized, i.e., a zero, or near zero. The desirable width of the waveguide core is determined by calculating the distribution of stress in the top cladding over a change in temperature. From this distribution of stress, a relationship between the polarization dependent wavelength and variable widths of the waveguide in the arrayed waveguide grating are determined. This relationship determines a zero value, or near zero value, of polarization dependent wavelength for a given range of waveguide widths. Accordingly, the width of the waveguide may be selected such that the polarization dependent wavelength is minimized.Type: ApplicationFiled: March 28, 2008Publication date: October 2, 2008Applicant: Lightwave Microsystems CorporationInventors: Farnaz Parhami, Liang Zhao, Fan Zhong
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Patent number: 6850670Abstract: A method and apparatus for controlling waveguide birefringence by selection of a waveguide core width for a tuned top clad is described herein. A tuned top cladding describes a pre-existing dopant concentration within a top cladding material. Given a tuned top cladding composition, a width of the waveguide core is pre-selected such that birefringence is minimized, i.e., a zero, or near zero. The desirable width of the waveguide core is determined by calculating the distribution of stress in the top cladding over a change in temperature. From this distribution of stress, a relationship between the polarization dependent wavelength and variable widths of the waveguide in the arrayed waveguide grating are determined. This relationship determines a zero value, or near zero value, of polarization dependent wavelength for a given range of waveguide widths. Accordingly, the width of the waveguide may be selected such that the polarization dependent wavelength is minimized.Type: GrantFiled: June 28, 2001Date of Patent: February 1, 2005Assignee: Lightwave Microsytstems CorporationInventors: Farnaz Parhami, Liang Zhao, Fan Zhong
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Patent number: 6826345Abstract: One aspect of the invention relates to a PLC containing at least one waveguide on a bottom clad layer, each waveguide having a top cap layer on an upper surface thereof, and a top clad layer over the waveguides having the top cap on the upper portion thereof. The presence of the top cap reduces waveguide birefringence and resultant polarization dependence in PLCs, particularly for reducing polarization dependent wavelength shift in AWGs. Another aspect of the invention relates to methods of making PLCs involving forming a waveguide layer on a bottom clad layer, forming a top cap layer on the waveguide layer, patterning the waveguide layer and the top cap layer using a mask to form waveguides having a top cap on an upper portion thereof, and forming a top clad layer over the waveguides having the top cap on the upper portion thereof.Type: GrantFiled: June 10, 2002Date of Patent: November 30, 2004Assignee: Lightwave Microsystems CorporationInventors: Fan Zhong, Farnaz Parhami, Zhigang Zhou
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Patent number: 6704487Abstract: A method of making an optical waveguide structure for an active PLC device having a reduced dn/dt birefringence. The method includes the step of forming a waveguide core layer on a bottom cladding, the waveguide core layer having a higher refractive index than the bottom cladding. The waveguide core layer is then etched to define a waveguide core. A top cladding is subsequently formed over the waveguide core and the bottom cladding. The top cladding also has a lower refractive index than the waveguide core. The top cladding is then etched to define a first trench and a second trench parallel to the waveguide core. The first trench and the second trench are configured to relieve a stress on the waveguide core. This stress can be induced by a heater, as in a case where the active PLC is a thermo-optic PLC. The first trench and the second trench can extend from an upper surface of the top cladding to an upper surface of the bottom cladding.Type: GrantFiled: August 10, 2001Date of Patent: March 9, 2004Assignee: Lightwave Microsystems CorporationInventors: Farnaz Parhami, Alice Liu, Pamela S. Trammel
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Publication number: 20030133684Abstract: A method of making a polarization insensitive optical waveguide structure. An optical core layer is formed on a substrate, wherein the optical core layer has a higher refractive index than the substrate. A mask is formed over the optical core layer. The unmasked areas of the optical core layer are then over-etched to define the core, wherein the over-etching removes the unmasked area of the optical core layer and a portion of the substrate disposed beneath the unmasked area, and defines the optical core. The mask is subsequently removed from the optical core. A cladding layer is then formed over the optical core and the substrate, the cladding layer having a lower refractive index than the optical core, to form a polarization insensitive optical waveguide structure. The amount of over-etching can be controlled to control an amount of substrate disposed beneath the unmasked area of the optical core layer that is removed.Type: ApplicationFiled: January 23, 2003Publication date: July 17, 2003Applicant: LIGHTWAVE MICROSYSTEMS CORPORATIONInventors: Jongik Won, Fan Zhong, Farnaz Parhami, Nizar S. Kheraj
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Patent number: 6542687Abstract: A method of making a polarization insensitive optical waveguide structure. An optical core layer is formed on a substrate, wherein the optical core layer has a higher refractive index than the substrate. A mask is formed over the optical core layer. The unmasked areas of the optical core layer are then over-etched to define the core, wherein the over-etching removes the unmasked area of the optical core layer and a portion of the substrate disposed beneath the unmasked area, and defines the optical core. The mask is subsequently removed from the optical core. A cladding layer is then formed over the optical core and the substrate, the cladding layer having a lower refractive index than the optical core, to form a polarization insensitive optical waveguide structure. The amount of over-etching can be controlled to control an amount of substrate disposed beneath the unmasked area of the optical core layer that is removed.Type: GrantFiled: May 31, 2001Date of Patent: April 1, 2003Assignee: Lightwave Microsystems, Inc.Inventors: Jongik Won, Fan Zhong, Farnaz Parhami, Nizar S. Kheraj
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Publication number: 20030031445Abstract: A method of making an optical waveguide structure for an active PLC device having a reduced dn/dt birefringence. The method includes the step of forming a waveguide core layer on a bottom cladding, the waveguide core layer having a higher refractive index than the bottom cladding. The waveguide core layer is then etched to define a waveguide core. A top cladding is subsequently formed over the waveguide core and the bottom cladding. The top cladding also has a lower refractive index than the waveguide core. The top cladding is then etched to define a first trench and a second trench parallel to the waveguide core. The first trench and the second trench are configured to relieve a stress on the waveguide core. This stress can be induced by a heater, as in a case where the active PLC is a thermo-optic PLC. The first trench and the second trench can extend from an upper surface of the top cladding to an upper surface of the bottom cladding.Type: ApplicationFiled: August 10, 2001Publication date: February 13, 2003Inventors: Farnaz Parhami, Alice Liu, Pamela S. Trammel
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Publication number: 20030021513Abstract: A method and apparatus for controlling waveguide birefringence by selection of a waveguide core width for a tuned top clad is described herein. A tuned top cladding describes a pre-existing dopant concentration within a top cladding material. Given a tuned top cladding composition, a width of the waveguide core is pre-selected such that birefringence is minimized, i.e., a zero, or near zero. The desirable width of the waveguide core is determined by calculating the distribution of stress in the top cladding over a change in temperature. From this distribution of stress, a relationship between the polarization dependent wavelength and variable widths of the waveguide in the arrayed waveguide grating are determined. This relationship determines a zero value, or near zero value, of polarization dependent wavelength for a given range of waveguide widths. Accordingly, the width of the waveguide may be selected such that the polarization dependent wavelength is minimized.Type: ApplicationFiled: June 28, 2001Publication date: January 30, 2003Inventors: Farnaz Parhami, Liang Zhao, Fan Zhong
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Publication number: 20020181916Abstract: A method of making a polarization insensitive optical waveguide structure. An optical core layer is formed on a substrate, wherein the optical core layer has a higher refractive index than the substrate. A mask is formed over the optical core layer. The unmasked areas of the optical core layer are then over-etched to define the core, wherein the over-etching removes the unmasked area of the optical core layer and a portion of the substrate disposed beneath the unmasked area, and defines the optical core. The mask is subsequently removed from the optical core. A cladding layer is then formed over the optical core and the substrate, the cladding layer having a lower refractive index than the optical core, to form a polarization insensitive optical waveguide structure. The amount of over-etching can be controlled to control an amount of substrate disposed beneath the unmasked area of the optical core layer that is removed.Type: ApplicationFiled: May 31, 2001Publication date: December 5, 2002Inventors: Jongik Won, Fan Zhong, Farnaz Parhami, Nizar S. Kheraj