Patents by Inventor Ramesh Sundaram
Ramesh Sundaram 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: 11990936Abstract: An optical isolator includes a polarizer for receiving and passing an optical signal received from an optical signal source to a garnet which rotates a polarization of the optical signal by an angle of 45°??1°, where 5°??1°<42°, and outputs at least a part of this polarization rotated optical signal to an analyzer, having a polarization optical axis at 45°+?2°, where 5°??2°<42°. The analyzer outputs at least a part of the polarization rotated optical signal to an external optical circuit which reflects at least a part of the polarization rotated optical signal back to the garnet via the analyzer. The garnet rotates a polarization of the reflected optical signal by an angle of 45°??1° and outputs this latter polarization rotated optical signal to the polarizer which at least partially blocks it from the optical signal source.Type: GrantFiled: October 10, 2022Date of Patent: May 21, 2024Assignee: II-VI Delaware, Inc.Inventor: Ramesh Sundaram
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Publication number: 20240121001Abstract: An optical isolator includes a polarizer for receiving and passing an optical signal received from an optical signal source to a garnet which rotates a polarization of the optical signal by an angle of 45°??1°, where 5°??1°<42°, and outputs at least a part of this polarization rotated optical signal to an analyzer, having a polarization optical axis at 45°+?2°, where 5°??2°<42°. The analyzer outputs at least a part of the polarization rotated optical signal to an external optical circuit which reflects at least a part of the polarization rotated optical signal back to the garnet via the analyzer. The garnet rotates a polarization of the reflected optical signal by an angle of 45°??1° and outputs this latter polarization rotated optical signal to the polarizer which at least partially blocks it from the optical signal source.Type: ApplicationFiled: October 10, 2022Publication date: April 11, 2024Inventor: Ramesh Sundaram
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Patent number: 8820095Abstract: A vortex-based temperature control system comprises a test chamber configured to receive a test article therein, a sensor disposed within the test chamber for detecting a temperature within the test chamber, a first vortex tube coupled to the test chamber for providing a heating airflow to the test chamber, and a second vortex tube coupled to the test chamber for providing a cooling airflow to the test chamber. The system also comprises a temperature controller coupled to the sensor and configured to control an airflow delivered to the first and second vortex tubes to obtain a desired temperature setting within the test chamber.Type: GrantFiled: June 26, 2008Date of Patent: September 2, 2014Assignee: Finisar CorporationInventors: Ken Lessig, Kevin Cronk, Brian O'Malley, Matt Swain, Ramesh Sundaram
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Patent number: 8104950Abstract: In one example embodiment, a board for measuring device temperatures comprises a base and one or more fingers extending from the base. The base and the one or more fingers comprise a flexible material. One or more first temperature sensors are disposed on the one or more fingers. One or more second temperature sensors are disposed on the base. Each of the first and second temperature sensors comprises a partially thermally isolated temperature sensor.Type: GrantFiled: December 8, 2008Date of Patent: January 31, 2012Assignee: Finisar CorporationInventors: Alex Fishman, Peter A. Scranton, Ramesh Sundaram
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Patent number: 7978974Abstract: The embodiments disclosed herein relate an insertable shield clip for use in controlling electromagnetic interference in an optical transceiver module. The optical transceiver module may include a shell that houses first and second optical subassemblies and an enclosure that cooperates with the shell in defining a covering for the optical transceiver module. The shield clip may comprise a body composed of conductive material. The body may include first and second vertical side members. The body may also include first and second shield members that are each configured to receive a corresponding nosepiece of one of the first and second optical subassemblies. The body may further include a bottom member that interconnects the first and second vertical side members and the first and second shield members.Type: GrantFiled: September 24, 2007Date of Patent: July 12, 2011Assignee: Finisar CorporationInventors: Chris K. Togami, Ramesh Sundaram, Hermando Esguerra
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Publication number: 20090159715Abstract: A vortex-based temperature control system comprises a test chamber configured to receive a test article therein, a sensor disposed within the test chamber for detecting a temperature within the test chamber, a first vortex tube coupled to the test chamber for providing a heating airflow to the test chamber, and a second vortex tube coupled to the test chamber for providing a cooling airflow to the test chamber. The system also comprises a temperature controller coupled to the sensor and configured to control an airflow delivered to the first and second vortex tubes to obtain a desired temperature setting within the test chamber.Type: ApplicationFiled: June 26, 2008Publication date: June 25, 2009Applicant: FINISAR CORPORATIONInventors: Ken LESSIG, Kevin CRONK, Brian O'MALLEY, Matt SWAIN, Ramesh SUNDARAM
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Publication number: 20090147820Abstract: In one example embodiment, a board for measuring device temperatures comprises a base and one or more fingers extending from the base. The base and the one or more fingers comprise a flexible material. One or more first temperature sensors are disposed on the one or more fingers. One or more second temperature sensors are disposed on the base. Each of the first and second temperature sensors comprises a partially thermally isolated temperature sensor.Type: ApplicationFiled: December 8, 2008Publication date: June 11, 2009Applicant: FINISAR CORPORATIONInventors: Alex Fishman, Peter A. Scranton, Ramesh Sundaram
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Publication number: 20090028557Abstract: The embodiments disclosed herein relate an insertable shield clip for use in controlling electromagnetic interference in an optical transceiver module. The optical transceiver module may include a shell that houses first and second optical subassemblies and an enclosure that cooperates with the shell in defining a covering for the optical transceiver module. The shield clip may comprise a body composed of conductive material. The body may include first and second vertical side members. The body may also include first and second shield members that are each configured to receive a corresponding nosepiece of one of the first and second optical subassemblies. The body may further include a bottom member that interconnects the first and second vertical side members and the first and second shield members.Type: ApplicationFiled: September 24, 2007Publication date: January 29, 2009Inventors: Chris K. Togami, Ramesh Sundaram, Hermando Esguerra
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Patent number: 7396165Abstract: An optical connector includes a base member having a first hollow bore extending from a first end toward a second end, and a recess coaxially aligned with the first hollow bore. The recess has a first internal perimeter and a second internal perimeter. The first perimeter is smaller than said second perimeter. The base member can have a post extending up from a bottom of the recess. The first hollow bore passes through the past and terminates at an end of the post. The post can have an end that terminates substantially in alignment with at least a portion of a termination region disposed between the first internal perimeter and the second internal perimeter.Type: GrantFiled: October 30, 2003Date of Patent: July 8, 2008Assignee: Finisar CorporationInventors: Jignesh Shah, Subra Nagarajan, Ramesh Sundaram
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Patent number: 7178995Abstract: Embodiments of the invention generally provide an optical component configured to minimize reflectance. The component generally includes an optical housing having a bore formed therethrough, the bore having a central component receiving portion, and a glass block positioned in the component receiving portion in abutment with a fiber receiving bore. The component further includes a fuzzy mount secured in the central component receiving portion, the fuzzy mount being secured via a plurality of extending teeth formed on an outer surface thereof, the teeth being configured to engage an inner surface of the central component receiving portion to secure the fuzzy mount therein.Type: GrantFiled: May 5, 2003Date of Patent: February 20, 2007Assignee: Finisar CorporationInventors: Lew Aronson, Jignesh Shah, Paul Rosenberg, Ramesh Sundaram
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Patent number: 7079746Abstract: Embodiments of the invention generally provide an optical component configured to minimize reflectance. The component generally includes an optical housing having a device receiving end, a fiber receiving end, and an intermediate portion, wherein a bore connects the fiber receiving end to the device receiving end via the intermediate portion. The component further includes a split sleeve assembly press fitted into the intermediate portion, and a fiber stub press fitted into the split sleeve assembly, the fiber stub being positioned proximate a terminating end of the split sleeve.Type: GrantFiled: May 5, 2003Date of Patent: July 18, 2006Assignee: Finisar CorporationInventors: Lew Aronson, Jignesh Shah, Paul Rosenberg, Ramesh Sundaram
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Patent number: 7050694Abstract: Method and apparatus of attenuating an optical signal without adding extra components is presented. The drive current of the optical signal source is set to meet a predetermined bandwidth requirement and exceed a predetermined amplitude requirement. An optical isolator that is used to prevent back-reflections from reaching the optical signal source is used to achieve the desired amount of attenuation. More specifically, the invention includes controlling the attenuation by tuning an angle ? between the transmission axis of a polarizer that is part of the optical isolator and the original polarization state of the optical signal. By increasing the angle ?, the amount of attenuation is increased; by decreasing the angle ?, the amount of attenuation is decreased. The invention allows continuous tuning of the angle ?.Type: GrantFiled: April 29, 2003Date of Patent: May 23, 2006Assignee: Finisar CorporationInventors: Todd L. Gustavson, Konstantinos G. Haritos, Subra Nagarajan, Ramesh Sundaram
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Patent number: 6921213Abstract: A modular TOSA that is compatible with multiple optical fiber connector standards and a method of making the TOSA are presented. With the invention, a modular TOSA can be made compatible with different connector standards by switching the nose assembly while keeping the port assembly design and the adapter assembly design constant. The nose assembly that is compatible with the desired connector standard is selected from a group of nose assemblies, which are designed to be coupled with the same port assembly but having different connector standards.Type: GrantFiled: April 29, 2003Date of Patent: July 26, 2005Assignee: Finisar CorporationInventors: Paul Rosenberg, Martin Wisecarver, Ramesh Sundaram, Dean Haritos, Todd L. Gustavson
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Patent number: 6899456Abstract: Glide heads for the detection of asperities on a storage disc have a thermal transducer oriented along the air bearing surface. The thermal transducer generally is in electrical contact with a circuit to measure the electrical resistance of the thermal transducer. Preferred methods of depositing the thermal transducer involve the deposition of the thermal transducer on the smooth surface of a wafer prior to the slicing of individual sliders.Type: GrantFiled: October 21, 1998Date of Patent: May 31, 2005Assignee: Seagate Technology LLCInventors: Ramesh Sundaram, Wei H. Yao
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Patent number: 6891698Abstract: An improved glide head has an air bearing surface with a flatness of less than about 1 ?inch. The air bearing surfaces are formed from the very smooth and flat surface of a wafer, preferably prior to slicing the glide heads from the wafer. Thus, a wafer is formed having a flat surface with a plurality of air bearing surface contoured onto the surface. To form a glide head, a transducer can be mounted on the air bearing surface or the surface opposite the air bearing surface, preferably at the wafer level before slicing.Type: GrantFiled: December 11, 2001Date of Patent: May 10, 2005Assignee: Seagate Technology LLCInventors: Ramesh Sundaram, Wei Yao
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Publication number: 20040120655Abstract: An optical connector includes a base member having a first hollow bore extending from a first end toward a second end, and a recess coaxially aligned with the first hollow bore. The recess has a first internal perimeter and a second internal perimeter. The first perimeter is smaller than said second perimeter. The base member can have a post extending up from a bottom of the recess. The first hollow bore passes through the past and terminates at an end of the post. The post can have an end that terminates substantially in alignment with at least a portion of a termination region disposed between the first internal perimeter and the second internal perimeter.Type: ApplicationFiled: October 30, 2003Publication date: June 24, 2004Applicant: FINISAR CORPORATIONInventors: Jignesh Shah, Subra Nagarajan, Ramesh Sundaram
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Publication number: 20040086239Abstract: A modular TOSA that is compatible with multiple optical fiber connector standards and a method of making the TOSA are presented. With the invention, a modular TOSA can be made compatible with different connector standards by switching the nose assembly while keeping the port assembly design and the adapter assembly design constant. The nose assembly that is compatible with the desired connector standard is selected from a group of nose assemblies, which are designed to be coupled with the same port assembly but having different connector standards.Type: ApplicationFiled: April 29, 2003Publication date: May 6, 2004Inventors: Paul Rosenberg, Martin Wisecarver, Ramesh Sundaram, Dean Haritos, Todd L. Gustavson
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Publication number: 20040086233Abstract: Embodiments of the invention generally provide an optical component configured to minimize reflectance. The component generally includes an optical housing having a bore formed therethrough, the bore having a central component receiving portion, and a glass block positioned in the component receiving portion in abutment with a fiber receiving bore. The component further includes a fuzzy mount secured in the central component receiving portion, the fuzzy mount being secured via a plurality of extending teeth formed on an outer surface thereof, the teeth being configured to engage an inner surface of the central component receiving portion to secure the fuzzy mount therein.Type: ApplicationFiled: May 5, 2003Publication date: May 6, 2004Applicant: Finisar CorporationInventors: Lew Aronson, Jignesh Shah, Paul Rosenberg, Ramesh Sundaram
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Publication number: 20040086234Abstract: Embodiments of the invention generally provide an optical component configured to minimize reflectance. The component generally includes an optical housing having a device receiving end, a fiber receiving end, and an intermediate portion, wherein a bore connects the fiber receiving end to the device receiving end via the intermediate portion. The component further includes a split sleeve assembly press fitted into the intermediate portion, and a fiber stub press fitted into the split sleeve assembly, the fiber stub being positioned proximate a terminating end of the split sleeve.Type: ApplicationFiled: May 5, 2003Publication date: May 6, 2004Applicant: Finisar CorporationInventors: Lew Aronson, Jignesh Shah, Paul Rosenberg, Ramesh Sundaram
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Publication number: 20040086256Abstract: Method and apparatus of attenuating an optical signal without adding extra components is presented. The drive current of the optical signal source is set to meet a predetermined bandwidth requirement and exceed a predetermined amplitude requirement. An optical isolator that is used to prevent back-reflections from reaching the optical signal source is used to achieve the desired amount of attenuation. More specifically, the invention includes controlling the attenuation by tuning an angle &thgr; between the transmission axis of a polarizer that is part of the optical isolator and the original polarization state of the optical signal. By increasing the angle &thgr;, the amount of attenuation is increased; by decreasing the angle &thgr;, the amount of attenuation is decreased. The invention allows continuous tuning of the angle &thgr;.Type: ApplicationFiled: April 29, 2003Publication date: May 6, 2004Inventors: Todd L. Gustavson, Konstantinos G. Haritos, Subra Nagarajan, Ramesh Sundaram