Patents by Inventor Sagi Varghese Mathai

Sagi Varghese Mathai 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).

  • Publication number: 20210141171
    Abstract: Examples herein relate to optical modules. In particular, implementations herein relate to optical modules that include top-emitting VCSELs and/or top-entry photodetectors. The optical modules include a first interposer having opposing first and second sides and a second interposer having opposing first and second sides. The optical modules include a plurality of top-emitting vertical-cavity surface-emitting lasers (VCSELs) coupled to the second interposer and a plurality of electrical conductors forming electrical paths between electrical contacts of the top-emitting VCSELs and the second side of the second interposer. The VCSELs are configured to emit optical signals having different wavelengths. The optical signals are configured to be combined and transmitted over a single optical fiber.
    Type: Application
    Filed: November 7, 2019
    Publication date: May 13, 2021
    Inventors: Sagi Varghese Mathai, Paul Kessler Rosenberg, Wayne Victor Sorin, Michael Renne Ty Tan
  • Patent number: 11002926
    Abstract: Examples herein relate to optical modules. In particular, implementations herein relate to optical modules that include top-emitting VCSELs and/or top-entry photodetectors. The optical modules include a first interposer having opposing first and second sides and a second interposer having opposing first and second sides. The optical modules include a plurality of top-emitting vertical-cavity surface-emitting lasers (VCSELs) coupled to the second interposer and a plurality of electrical conductors forming electrical paths between electrical contacts of the top-emitting VCSELs and the second side of the second interposer. The VCSELs are configured to emit optical signals having different wavelengths. The optical signals are configured to be combined and transmitted over a single optical fiber.
    Type: Grant
    Filed: November 7, 2019
    Date of Patent: May 11, 2021
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Sagi Varghese Mathai, Paul Kessler Rosenberg, Wayne Victor Sorin, Michael Renne Ty Tan
  • Patent number: 10985531
    Abstract: A VCSEL device includes a substrate and a first DBR structure disposed on the substrate. The VCSEL device further includes a cathode contact disposed on a top surface of the first DBR structure. In addition, the VCSEL device includes a VCSEL mesa that is disposed on the top surface of the first DBR structure. The VCSEL mesa includes a quantum well, a non-circularly-shaped oxide aperture region disposed above the quantum well, and a second DBR structure disposed above the non-circularly-shaped oxide aperture region. In addition, the VCSEL mesa includes a selective polarization structure disposed above the second DBR structure and an anode contact disposed above the selective polarization structure.
    Type: Grant
    Filed: January 27, 2019
    Date of Patent: April 20, 2021
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Binhao Wang, Wayne Sorin, Michael Renne Ty Tan, Sagi Varghese Mathai, Stanley Cheung
  • Patent number: 10976508
    Abstract: Optical modules are disclosed. An example optical module includes a substrate comprising a grating coupler, an optical connector removably coupled to the substrate adjacent the grating coupler to optically couple the optical connector and the grating coupler and an integrated circuit coupled to the substrate.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: April 13, 2021
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Sagi Varghese Mathai, Wayne Victor Sorin, Michael Renne Ty Tan
  • Patent number: 10897122
    Abstract: An optical apparatus is provided for an optical transceiver. The optical apparatus includes an interposer, a glass lens chip bonded to the interposer, and a plurality of bottom-emitting vertical-cavity surface-emitting lasers (VCSELs) flip chipped to the interposer. Each of the bottom-emitting VCSELs is fabricated on a respective substrate, at least one bottom-emitting VCSEL is capable of emitting an optical signal having a wavelength of about 850 nm, and at least a portion of the respective substrate on which the at least one bottom-emitting VCSEL is fabricated is removed to permit the at least one bottom-emitting VCSEL to emit the optical signal having the wavelength of about 850 nm to the glass lens chip.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: January 19, 2021
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Sagi Varghese Mathai, Michael Renee Ty Tan
  • Publication number: 20200343695
    Abstract: Examples herein relate to optical modules. In particular, implementations herein relate to optical modules that include top-emitting VCSELs and/or top-entry photodetectors. The optical modules include a substrate having opposing first and second sides. The optical modules further includes a first interposer having opposing first and second sides and a plurality of top-emitting vertical-cavity surface-emitting lasers (VCSELs). The VCSELs are flip-chipped to the second side of the first interposer such that they are disposed between the substrate and the first interposer. The VCSELs are configured to emit optical signals having different wavelengths. The optical signals are configured to be combined and transmitted over a single optical fiber. The optical modules include a plurality of electrical conductors forming electrical paths between electrical contacts of the top-emitting VCSELs and the substrate.
    Type: Application
    Filed: April 29, 2019
    Publication date: October 29, 2020
    Inventors: Sagi Varghese Mathai, Paul Kessler Rosenberg, Wayne Victor Sorin, Michael Renne Ty Tan
  • Publication number: 20200341200
    Abstract: Examples herein relate to multi-layer grating couplers. In particular, implementations herein relate to multi-layer grating couplers that include a first grating layer, an angle correction layer disposed over the first grating layer, and an oxide layer disposed between the first grating layer and the angle correction layer. The multi-layer grating coupler further includes a waveguide layer disposed at a same elevation as or below the first grating layer. The first grating layer is configured to convert a propagation direction of light from an in-plane direction through the waveguide layer to a near-vertical or non-in-plane direction into the angle correction layer. The angle correction layer is configured to tilt an output coupling angle of the light from the first grating layer such that the light exits the multi-layer grating coupler into an optical fiber at a same angle as the optical fiber.
    Type: Application
    Filed: April 29, 2019
    Publication date: October 29, 2020
    Inventors: Thomas Van Vaerenbergh, Peng Sun, Sagi Varghese Mathai
  • Publication number: 20200244040
    Abstract: A VCSEL device includes a substrate and a first DBR structure disposed on the substrate. The VCSEL device further includes a cathode contact disposed on a top surface of the first DBR structure. In addition, the VCSEL device includes a VCSEL mesa that is disposed on the top surface of the first DBR structure. The VCSEL mesa includes a quantum well, a non-circularly-shaped oxide aperture region disposed above the quantum well, and a second DBR structure disposed above the non-circularly-shaped oxide aperture region. In addition, the VCSEL mesa includes a selective polarization structure disposed above the second DBR structure and an anode contact disposed above the selective polarization structure.
    Type: Application
    Filed: January 27, 2019
    Publication date: July 30, 2020
    Inventors: Binhao Wang, Wayne Sorin, Michael Renne Ty Tan, Sagi Varghese Mathai, Stanley Cheung
  • Patent number: 10700494
    Abstract: In the examples provided herein, a data center transmission system includes a VCSEL (vertical-cavity surface-emitting laser) that lases in a single spatial mode with a side mode suppression ratio of at least 25 dB, where the VCSEL is formed on a substrate and lases at a wavelength transparent to the substrate, and further where an output of the VCSEL exits through the substrate. Also, the VCSEL is directly modulated. The system further includes an optical fiber having a first end to receive the output of the VCSEL for propagation along the optical fiber. The optical fiber supports a single spatial mode without supporting higher order spatial modes over a range of wavelengths between 1260 nm and 1360 nm. The system also includes a receiver to receive the directly modulated output of the VCSEL after propagation through the optical fiber.
    Type: Grant
    Filed: April 1, 2016
    Date of Patent: June 30, 2020
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Wayne Victor Sorin, Michael Renne Ty Tan, Sagi Varghese Mathai
  • Patent number: 10680714
    Abstract: Techniques related to optical devices including a high contrast grating (HCG) lens are described herein. In an example, an optical device includes a transparent substrate. A laser emitter or detector at a first side of the transparent substrate to emit or detect a laser light transmitted via the transparent substrate. A HCG lens is at a second side of the transparent substrate to transmit and refract the laser light.
    Type: Grant
    Filed: January 17, 2019
    Date of Patent: June 9, 2020
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Wayne Victor Sorin, Michael Renne Ty Tan, David A. Fattal, Sagi Varghese Mathai
  • Publication number: 20200057212
    Abstract: In the examples provided herein, an apparatus has a first substrate upon which one or more first filters have been fabricated on a first surface of the first substrate. The apparatus also has a second substrate upon which one or more second filters have been fabricated on a second surface of the second substrate, wherein the one or more first filters and the one or more second filters each transmit a different band of wavelengths. Additionally, the apparatus has a bonding material that bonds the first substrate to the second substrate.
    Type: Application
    Filed: October 28, 2019
    Publication date: February 20, 2020
    Inventors: Sagi Varghese Mathai, Georgios Panotopoulos, Michael Renne Ty Tan, Paul K. Rosenberg, Wayne V. Sorin
  • Patent number: 10564335
    Abstract: In the examples provided herein, an apparatus has an optically transparent block having a filter surface. The apparatus also has two or more filters, where each of the filters has thin films fabricated on an optically transparent substrate, and further wherein the thin films of the filters are coupled to the filter surface. Additionally, the apparatus has an optically transparent overmold material encasing the two or more filters, where the overmold material fills a volume between and above neighboring ones of the two or more filters.
    Type: Grant
    Filed: April 10, 2015
    Date of Patent: February 18, 2020
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Sagi Varghese Mathai, Paul Kessler Rosenberg, Michael Renne Ty Tan
  • Patent number: 10488593
    Abstract: In the examples provided herein, a polarization diversity receiver system includes a loop waveguide, and a two-dimensional grating coupler formed on the loop waveguide to couple light impinging on the grating coupler having a first polarization into the loop waveguide in a first direction, and to couple light having a second polarization orthogonal to the first polarization into the loop waveguide in a second direction. The system also includes a first output waveguide positioned near the loop waveguide in a first coupling region, a first distributed perturbation having a first resonant wavelength in the first coupling region to cause coupling of light at the first resonant wavelength between the loop waveguide and the first output waveguide, and a first photodetector to detect light propagating out of a first end and a second end of the first output waveguide.
    Type: Grant
    Filed: April 8, 2016
    Date of Patent: November 26, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Joaquin Matres, Wayne Victor Sorin, Stanley Cheung, Sagi Varghese Mathai, Michael Renne Ty Tan
  • Patent number: 10459174
    Abstract: In the examples provided herein, an apparatus has a first substrate upon which one or more first filters have been fabricated on a first surface of the first substrate. The apparatus also has a second substrate upon which one or more second filters have been fabricated on a second surface of the second substrate, wherein the one or more first filters and the one or more second filters each transmit a different band of wavelengths. Additionally, the apparatus has a bonding material that bonds the first substrate to the second substrate.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: October 29, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Sagi Varghese Mathai, Georgios Panotopoulos, Michael Renne Ty Tan, Paul K Rosenberg, Wayne V Sorin
  • Publication number: 20190326731
    Abstract: An optical apparatus is provided for an optical transceiver. The optical apparatus includes an interposer, a glass lens chip bonded to the interposer, and a plurality of bottom-emitting vertical-cavity surface-emitting lasers (VCSELs) flip chipped to the interposer. Each of the bottom-emitting VCSELs is fabricated on a respective substrate, at least one bottom-emitting VCSEL is capable of emitting an optical signal having a wavelength of about 850 nm, and at least a portion of the respective substrate on which the at least one bottom-emitting VCSEL is fabricated is removed to permit the at least one bottom-emitting VCSEL to emit the optical signal having the wavelength of about 850 nm to the glass lens chip.
    Type: Application
    Filed: April 20, 2018
    Publication date: October 24, 2019
    Inventors: Sagi Varghese Mathai, Michael Renee Ty Tan
  • Patent number: 10388807
    Abstract: An example device in accordance with an aspect of the present disclosure includes a photodetector disposed on a substrate, and a mirror disposed on the photodetector. The mirror is to reflect light back into the photodetector. The mirror includes a reflective layer and a second layer. The second layer is disposed between the reflective layer and the photodetector.
    Type: Grant
    Filed: April 30, 2014
    Date of Patent: August 20, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Sagi Varghese Mathai, Michael Renne Ty Tan
  • Publication number: 20190173584
    Abstract: Techniques related to optical devices including a high contrast grating (HCG) lens are described herein. In an example, an optical device includes a transparent substrate. A laser emitter or detector at a first side of the transparent substrate to emit or detect a laser light transmitted via the transparent substrate. A HCG lens is at a second side of the transparent substrate to transmit and refract the laser light.
    Type: Application
    Filed: January 17, 2019
    Publication date: June 6, 2019
    Inventors: Wayne Victor Sorin, MIchael Renne Ty Tan, David A. Fattal, Sagi Varghese Mathai
  • Publication number: 20190154920
    Abstract: In the examples provided herein, a polarization diversity receiver system includes a loop waveguide, and a two-dimensional grating coupler formed on the loop waveguide to couple light impinging on the grating coupler having a first polarization into the loop waveguide in a first direction, and to couple light having a second polarization orthogonal to the first polarization into the loop waveguide in a second direction. The system also includes a first output waveguide positioned near the loop waveguide in a first coupling region, a first distributed perturbation having a first resonant wavelength in the first coupling region to cause coupling of light at the first resonant wavelength between the loop waveguide and the first output waveguide, and a first photodetector to detect light propagating out of a first end and a second end of the first output waveguide.
    Type: Application
    Filed: April 8, 2016
    Publication date: May 23, 2019
    Inventors: Joaquin Matres, Wayne Victor Sorin, Stanley Cheung, Sagi Varghese Mathai, Michael Renne Ty Tan
  • Patent number: 10290996
    Abstract: A bottom-emitting vertical-cavity surface-emitting laser (VCSEL) structure includes a first substrate permitting the passage of light therethrough, an n-doped distributed Bragg reflector (nDBR), a p-doped distributed Bragg reflector (pDBR), one or more active layers, at least one of a high contrast grating mirror and a dielectric-enhanced metal mirror, and a plurality of layers, where the VCSEL structure is configured to be flip chipped to a second substrate. The pDBR and the nDBR define a laser cavity extending vertically therebetween and containing the one or more active layers. The at least one of a high contrast grating mirror and a dielectric-enhanced metal mirror may be disposed over the pDBR. The plurality of layers may be disposed over the at least one of the high contrast grating mirror and the dielectric-enhanced metal mirror to optically and hermetically seal the laser cavity.
    Type: Grant
    Filed: April 25, 2018
    Date of Patent: May 14, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Sagi Varghese Mathai, Stanley Cheung, Wayne V. Sorin, Michael Renne Ty Tan
  • Publication number: 20190115722
    Abstract: In the examples provided herein, a data center transmission system includes a VCSEL (vertical-cavity surface-emitting laser) that lases in a single spatial mode with a side mode suppression ratio of at least 25 dB, where the VCSEL is formed on a substrate and lases at a wavelength transparent to the substrate, and further where an output of the VCSEL exits through the substrate. Also, the VCSEL is directly modulated. The system further includes an optical fiber having a first end to receive the output of the VCSEL for propagation along the optical fiber. The optical fiber supports a single spatial mode without supporting higher order spatial modes over a range of wavelengths between 1260 nm and 1360 nm. The system also includes a receiver to receive the directly modulated output of the VCSEL after propagation through the optical fiber.
    Type: Application
    Filed: April 1, 2016
    Publication date: April 18, 2019
    Applicant: Hewlett Packard Enterprise Development LP
    Inventors: Wayne Victor Sorin, Michael Renne Ty Tan, Sagi Varghese Mathai