Patents by Inventor Utpal Chakrabarti

Utpal Chakrabarti 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).

  • Patent number: 10735101
    Abstract: A method of manufacturing an optical communication device includes preparing first and second pre-defined break lines in a carrier wafer. A first sub-mount is positioned near the first break line to accommodate an optical laser and a second sub-mount is positioned near the second break line to accommodate an optical modulator. The first sub-mount is secured to a thermally conductive and electrically nonconductive spacer which is secured to a thermo-electrical cooler that defines a gap between the first submount and the thermo-electrical cooler. A portion of the carrier wafer between the sub-mounts is removed.
    Type: Grant
    Filed: July 31, 2017
    Date of Patent: August 4, 2020
    Assignee: Cisco Technology, Inc.
    Inventors: Stefan Pfnuer, Ravi Kachru, John Fangman, Utpal Chakrabarti
  • Publication number: 20170331557
    Abstract: In one embodiment, a method of manufacturing an optical communication device is disclosed. An optical sub-assembly and optical platform can form the optical communication device. Pre-defined break lines are placed on a carrier wafer. The wafer can accommodate a modulator sub-mount and a laser sub-mount. A tooling process is used to place the modulator sub-mount on an optical platform and the laser sub-mount adjacent to a thermo-electrical cooler. The laser sub-mount can be hermetically enclosed and aligned to communicate with the modulator sub-mount.
    Type: Application
    Filed: July 31, 2017
    Publication date: November 16, 2017
    Inventors: Stefan Pfnuer, Ravi Kachru, John Fangman, Utpal Chakrabarti
  • Patent number: 9755752
    Abstract: A method of manufacturing an optical communication device aligns an optical sub-assembly and an optical modulator on a carrier wafer. A first sub-mount supports the optical sub-assembly and a second sub-mount supports the optical modulator. Pre-defined break lines are placed on the carrier wafer to accommodate separation of the sub-assembly and the optical modulator. The first sub-mount connects the optical sub-assembly to a thermoelectric cooler by either an epoxy, a spacer layer, or both. The optical sub-assembly is aligned in the x/y/z directions relative to the second sub-mount in a position to match an optical height of the optical modulator in the z-direction, wherein the z-direction is a vertical direction relative to the carrier wafer.
    Type: Grant
    Filed: January 13, 2014
    Date of Patent: September 5, 2017
    Assignee: Cisco Technology, Inc.
    Inventors: Stefan Pfnuer, Ravi Kachru, John Fangman, Utpal Chakrabarti
  • Patent number: 9235019
    Abstract: An apparatus for providing self-aligned optical coupling between an opto-electronic substrate and a fiber array, where the substrate is enclosed by a transparent lid such that the associated optical signals enter and exit the arrangement through the transparent lid. The apparatus takes the form of a two-part connectorized fiber array assembly where the two pieces uniquely mate to form a self-aligned configuration. A first part, in the form of a plate, is attached to the transparent lid in the area where the optical signals pass through. The first plate includes a central opening with inwardly-tapering sidewalls surrounding its periphery. A second plate is also formed to include a central opening and has a lower protrusion with inwardly-tapering sidewalls that mate with the inwardly-tapering sidewalls of the first plate to form the self-aligned connectorized fiber array assembly. The fiber array is then attached to the second plate in a self-aligned fashion.
    Type: Grant
    Filed: September 26, 2014
    Date of Patent: January 12, 2016
    Assignee: Cisco Technology, Inc.
    Inventors: Kalpendu Shastri, Soham Pathak, Utpal Chakrabarti, Vipulkumar Patel, Bipin Dama, Ravinder Kachru, Kishor Desai
  • Publication number: 20150121683
    Abstract: In one embodiment, a method of manufacturing an optical communication device is disclosed. An optical sub-assembly and optical platform can form the optical communication device. Pre-defined break lines are placed on a carrier wafer. The wafer can accommodate a modulator sub-mount and a laser sub-mount. A tooling process is used to place the modulator sub-mount on an optical platform and the laser sub-mount adjacent to a thermo-electrical cooler. The laser sub-mount can be hermetically enclosed and aligned to communicate with the modulator sub-mount.
    Type: Application
    Filed: January 13, 2014
    Publication date: May 7, 2015
    Inventors: Stefan Pfnuer, Ravi Kachru, John Fangman, Utpal Chakrabarti
  • Publication number: 20150016784
    Abstract: An apparatus for providing self-aligned optical coupling between an opto-electronic substrate and a fiber array, where the substrate is enclosed by a transparent lid such that the associated optical signals enter and exit the arrangement through the transparent lid. The apparatus takes the form of a two-part connectorized fiber array assembly where the two pieces uniquely mate to form a self-aligned configuration. A first part, in the form of a plate, is attached to the transparent lid in the area where the optical signals pass through. The first plate includes a central opening with inwardly-tapering sidewalls surrounding its periphery. A second plate is also formed to include a central opening and has a lower protrusion with inwardly-tapering sidewalls that mate with the inwardly-tapering sidewalls of the first plate to form the self-aligned connectorized fiber array assembly. The fiber array is then attached to the second plate in a self-aligned fashion.
    Type: Application
    Filed: September 26, 2014
    Publication date: January 15, 2015
    Inventors: Kalpendu SHASTRI, Soham PATHAK, Utpal CHAKRABARTI, Vipulkumar PATEL, Bipin DAMA, Ravinder KACHRU, Kishor DESAI
  • Patent number: 8876410
    Abstract: An apparatus for providing self-aligned optical coupling between an opto-electronic substrate and a fiber array, where the substrate is enclosed by a transparent lid such that the associated optical signals enter and exit the arrangement through the transparent lid. The apparatus takes the form of a two-part connectorized fiber array assembly where the two pieces uniquely mate to form a self-aligned configuration. A first part, in the form of a plate, is attached to the transparent lid in the area where the optical signals pass through. The first plate includes a central opening with inwardly-tapering sidewalls surrounding its periphery. A second plate is also formed to include a central opening and has a lower protrusion with inwardly-tapering sidewalls that mate with the inwardly-tapering sidewalls of the first plate to form the self-aligned connectorized fiber array assembly. The fiber array is then attached to the second plate in a self-aligned fashion.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: November 4, 2014
    Assignee: Cisco Technology, Inc.
    Inventors: Kalpendu Shastri, Soham Pathak, Utpal Chakrabarti, Vipulkumar Patel, Bipin Dama, Ravinder Kachru, Kishor Desai
  • Publication number: 20130188970
    Abstract: An apparatus for transmitting optical signals includes an interposer for supporting opto-electronic components used to create optical output signals. An enclosure is used to encapsulate the populated interposer assembly and includes a silicon sidewall and a transparent lid. The sidewall is etched to include a turning mirror feature with a reflecting surface at a predetermined angle ?, the turning mirror disposed to intercept the optical output signals and re-direct them through the enclosure's transparent lid. A coverplate is disposed over and aligned with the enclosure, where the coverplate includes a silicon sidewall member that is etched to include a turning mirror element with a reflecting surface at the same angle ? as the enclosure's turning mirror element. The optical signals re-directed by the enclosure then pass through the transparent lid of the enclosure, impinge the turning mirror element of the coverplate, and are then re-directed along the longitudinal axis.
    Type: Application
    Filed: January 19, 2013
    Publication date: July 25, 2013
    Inventors: Kalpendu Shastri, Vipulkumar Patel, Soham Pathak, Utpal Chakrabarti, Bipin Dama, Ravinder Kachru, Kishor Desai
  • Publication number: 20130183008
    Abstract: An apparatus for providing self-aligned optical coupling between an opto-electronic substrate and a fiber array, where the substrate is enclosed by a transparent lid such that the associated optical signals enter and exit the arrangement through the transparent lid. The apparatus takes the form of a two-part connectorized fiber array assembly where the two pieces uniquely mate to form a self-aligned configuration. A first part, in the form of a plate, is attached to the transparent lid in the area where the optical signals pass through. The first plate includes a central opening with inwardly-tapering sidewalls surrounding its periphery. A second plate is also formed to include a central opening and has a lower protrusion with inwardly-tapering sidewalls that mate with the inwardly-tapering sidewalls of the first plate to form the self-aligned connectorized fiber array assembly. The fiber array is then attached to the second plate in a self-aligned fashion.
    Type: Application
    Filed: January 9, 2013
    Publication date: July 18, 2013
    Inventors: Kalpendu Shastri, Soham Pathak, Utpal Chakrabarti, Vipulkumar Patel, Bipin Dama, Ravinder Kachru, Kishor Desai
  • Patent number: 8268663
    Abstract: In a method of annealing a Cd1-xZnxTe sample/wafer, surface contamination is removed from the sample/wafer and the sample/wafer is then introduced into a chamber. The chamber is evacuated and Hydrogen or Deuterium gas is introduced into the evacuated chamber. The sample/wafer is heated to a suitable annealing temperature in the presence of the Hydrogen or Deuterium gas for a predetermined period of time.
    Type: Grant
    Filed: June 2, 2009
    Date of Patent: September 18, 2012
    Assignee: II-VI Incorporated
    Inventors: Csaba Szeles, Michael Prokesch, Utpal Chakrabarti
  • Publication number: 20110136287
    Abstract: In a method of annealing a Cd1?xZnxTe sample/wafer, surface contamination is removed from the sample/wafer and the sample/wafer is then introduced into a chamber. The chamber is evacuated and Hydrogen or Deuterium gas is introduced into the evacuated chamber. The sample/wafer is heated to a suitable annealing temperature in the presence of the Hydrogen or Deuterium gas for a predetermined period of time.
    Type: Application
    Filed: June 2, 2009
    Publication date: June 9, 2011
    Applicant: II-VI INCORPORATED
    Inventors: Csaba Szeles, Michael Prokesch, Utpal Chakrabarti