Patents by Inventor Ashok Balakrishnan

Ashok Balakrishnan 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: 10172540
    Abstract: A multi-activity system may be configured to receive, upload, synchronize and process data for a variety of different activity types and/or recorded using multiple types of activity monitoring devices. In one example, an application interface may be defined with a multiple functions that are each useable by various types of devices and for processing multiple types of data. Additionally or alternatively, data for different activity types and/or recorded using different types of monitoring devices may be processed differently. Synchronization of data may further be handled on a device-by-device basis, device-type basis and/or activity-type basis using various tracking parameters.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: January 8, 2019
    Assignee: NIKE, Inc.
    Inventors: Ashok Balakrishnan, Christopher W. Davis, Jefferson Lyman, Sridhar Setti, Wade Convay, Tara Greer, Gaurabh Mathure, Christopher C. Thorwarth
  • Publication number: 20160296798
    Abstract: A multi-activity system may be configured to receive, upload, synchronize and process data for a variety of different activity types and/or recorded using multiple types of activity monitoring devices. In one example, an application interface may be defined with a multiple functions that are each useable by various types of devices and for processing multiple types of data. Additionally or alternatively, data for different activity types and/or recorded using different types of monitoring devices may be processed differently. Synchronization of data may further be handled on a device-by-device basis, device-type basis and/or activity-type basis using various tracking parameters.
    Type: Application
    Filed: March 16, 2016
    Publication date: October 13, 2016
    Inventors: Ashok Balakrishnan, Christopher W. Davis, Jefferson Lyman, Sridhar Setti, Wade Convay, Tara Greer, Gaurabh Mathure, Christopher C. Thorwarth
  • Patent number: 9323868
    Abstract: A multi-activity system may be configured to receive, upload, synchronize and process data for a variety of different activity types and/or recorded using multiple types of activity monitoring devices. In one example, an application interface may be defined with a multiple functions that are each useable by various types of devices and for processing multiple types of data. Additionally or alternatively, data for different activity types and/or recorded using different types of monitoring devices may be processed differently. Synchronization of data may further be handled on a device-by-device basis, device-type basis and/or activity-type basis using various tracking parameters.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: April 26, 2016
    Assignee: Nike, Inc.
    Inventors: Ashok Balakrishnan, Christopher W. Davis, Jefferson Lyman, Sridhar Setti, Wade Convay, Tara Greer, Gaurabh Mathure, Christopher C. Thorwarth
  • Patent number: 8126300
    Abstract: Segmented waveguide structures provide mode matching in planar lightwave circuits between waveguides and other waveguiding structures, e.g. slab waveguides and optical fibers. The present invention eliminates back reflections from the core segments by etching the leading and trailing faces of the core segments with a plurality of parallel facet sections, which are rearwardly offset in the transmission direction by an odd number of quarter wavelengths.
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: February 28, 2012
    Assignee: Enablence Inc.
    Inventors: Serge Bidnyk, Ashok Balakrishnan, Matt Pearson
  • Patent number: 7720335
    Abstract: The present invention relates to a hybrid planar lightwave circuit in which a silicon reflective diffraction grating etched with a highly accurate deep reactive ion etching process is mounted in a trench formed in a high optical performance silica on silicon waveguide device.
    Type: Grant
    Filed: October 1, 2007
    Date of Patent: May 18, 2010
    Assignee: Enablence Inc.
    Inventors: Matt Pearson, Ashok Balakrishnan, Serge Bidnyk
  • Publication number: 20090310912
    Abstract: An etched grating based chip provides a portion of each of a plurality of input optical signals from a plurality of laser diodes as optical feedback to the plurality of laser diodes, and couples the remaining light from the laser diodes onto an optical fiber, all the while maintaining a small form-factor, and meeting strict conditions regarding laser beat frequency. The present invention is applicable for both a single laser diode at a single wavelength and for an array of diodes at multiple wavelengths, which are multiplexed together in accordance with the present invention. The economics of laser diodes is much improved by decoupling the wavelength locking segment from the gain segment of the diode. Furthermore, the additional wavelength stability of such a locked diode will improve the performance and the economics of the network.
    Type: Application
    Filed: June 17, 2009
    Publication date: December 17, 2009
    Inventors: Serge Bidnyk, Ashok Balakrishnan, Matt Pearson
  • Publication number: 20090310913
    Abstract: Segmented waveguide structures provide mode matching in planar lightwave circuits between waveguides and other waveguiding structures, e.g. slab waveguides and optical fibers. The present invention eliminates back reflections from the core segments by etching the leading and trailing faces of the core segments with a plurality of parallel facet sections, which are rearwardly offset in the transmission direction by an odd number of quarter wavelengths.
    Type: Application
    Filed: June 17, 2009
    Publication date: December 17, 2009
    Inventors: Serge Bidnyk, Ashok Balakrishnan, Matt Pearson
  • Patent number: 7561764
    Abstract: A reflector chip of the present invention integrates a planar lightwave circuit (PLC) waveguide wafer and an active component, such as a photo-detector or laser, e.g. vertical cavity surface emitting laser. Typically, the PLC waveguide wafer includes a waveguide core region bound by upper and lower cladding layers. An end of the waveguide core region is mounted within a channel, trench, notch or recess within the bottom surface of the body of the reflector chip. A V-notch is also formed in the bottom surface of the body of the reflector, including a reflective surface, which redirects the light between the active component and the waveguide core region.
    Type: Grant
    Filed: February 6, 2008
    Date of Patent: July 14, 2009
    Assignee: Enablence Inc.
    Inventors: Serge Bidnyk, Matt Pearson, Ashok Balakrishnan
  • Patent number: 7474824
    Abstract: A planar lightwave circuit including a slab waveguide, with a plurality of different diffraction filtering elements optically coupling a plurality of input and output ports, provides various optical functionalities including multiplexing, demultiplexing, diplexer and triplexer. In the basic configuration one or more output ports are optically coupled to an input port via grating filters etching in the cladding of the slab waveguide, and an additional port is optically coupled to the input port via a diffraction grating etched in an endwall of the slab waveguide. A triplexer platform can be provided by optically coupling photo-detectors to two output ports, which receive wavelength channels demultiplexed from an input signal by two cladding etched filters, and by optically coupling a laser to another input port, which launches an outgoing laser signal at the endwall etched grating filter for coupling into the same fiber that launched the original input signal.
    Type: Grant
    Filed: March 23, 2007
    Date of Patent: January 6, 2009
    Assignee: Enablence Inc.
    Inventors: Serge Bidnyk, Ashok Balakrishnan, Matt Pearson
  • Publication number: 20080240654
    Abstract: The present invention relates to a hybrid planar lightwave circuit in which a silicon reflective diffraction grating etched with a highly accurate deep reactive ion etching process is mounted in a trench formed in a high optical performance silica on silicon waveguide device.
    Type: Application
    Filed: October 1, 2007
    Publication date: October 2, 2008
    Inventors: Matt Pearson, Ashok Balakrishnan, Serge Bidnyk
  • Publication number: 20080226221
    Abstract: A reflector chip of the present invention integrates a planar lightwave circuit (PLC) waveguide wafer and an active component, such as a photo-detector or laser, e.g. vertical cavity surface emitting laser. Typically, the PLC waveguide wafer includes a waveguide core region bound by upper and lower cladding layers. An end of the waveguide core region is mounted within a channel, trench, notch or recess within the bottom surface of the body of the reflector chip. A V-notch is also formed in the bottom surface of the body of the reflector, including a reflective surface, which redirects the light between the active component and the waveguide core region.
    Type: Application
    Filed: February 6, 2008
    Publication date: September 18, 2008
    Inventors: Serge BIDNYK, Matt PEARSON, Ashok BALAKRISHNAN
  • Patent number: 7420734
    Abstract: Diffraction gratings are formed from grooves each having a reflective facet and a non-reflective facet. The net reflection of TE (Transverse Electric) and TM (Transverse Magnetic) polarizations from the grating structure is traded off against the polarization dependent reflection, by controlling the degree of metallization of the reflective facet and by ensuring that there is no metallization of non-reflective sidewalls. other diffraction gratings are manufactured from trenches etched perpendicular to a waveguide. The trenches are metallized and back-filled with a filling material having a refractive index matched to that of the waveguide. The gratings essentially have no non-reflecting sidewalls with insignificant polarization influence from side walls.
    Type: Grant
    Filed: August 26, 2003
    Date of Patent: September 2, 2008
    Assignee: Valorbec Societe En Commandite
    Inventors: Ashok Balakrishnan, Kokou Dossou, Muthukumaran Packirisamy
  • Patent number: 7324195
    Abstract: Planar waveguide based grating devices and spectrometers, for species-specific wavelength detection for example, are disclosed. A planar waveguide spectrometer apparatus may have a microfluidic channel or compartment microfabricated integrally with a planar waveguide or hybrid assembled with the planar waveguide and optically coupled thereto. The planar waveguide may also include a thin planar substrate which is made of a transparent waveguiding optical material and has a planar multilayer, one or more input waveguides, a waveguide-based spectrometer, and one or more output waveguides integrally formed thereon. An apparatus which incorporates a planar waveguide, a diffractive construct for diffracting light through the planar waveguide onto a curved image surface, and a plurality of output waveguides emanating from the curved image surface at locations selected to extract predetermined wavelengths or wavelength ranges, is also disclosed.
    Type: Grant
    Filed: January 10, 2005
    Date of Patent: January 29, 2008
    Assignee: Valorbec Societe Em Commandite
    Inventors: Muthukumaran Packirisamy, Ashok Balakrishnan
  • Patent number: 7304797
    Abstract: The invention relates to a planar waveguide reflective diffraction grating for use in an optical device, such as a wavelength division multiplexer, providing an increased bandwidth over conventional planar waveguide reflection diffraction gratings while eliminating the polarization dependent loss (PDL) typically associated therewith. The multiplexer/demultiplexer according to the present invention includes input and output ports optimally positioned in accordance with the grating facet diffraction envelope to minimized back reflection to the input ports and maximize output light collected from different diffraction orders.
    Type: Grant
    Filed: June 3, 2005
    Date of Patent: December 4, 2007
    Assignee: Enablence Inc.
    Inventors: Ashok Balakrishnan, Serge Bidnyk, Matt Pearson
  • Publication number: 20070230871
    Abstract: A planar lightwave circuit including a slab waveguide, with a plurality of different diffraction filtering elements optically coupling a plurality of input and output ports, provides various optical functionalities including multiplexing, demultiplexing, diplexer and triplexer. In the basic configuration one or more output ports are optically coupled to an input port via grating filters etching in the cladding of the slab waveguide, and an additional port is optically coupled to the input port via a diffraction grating etched in an endwall of the slab waveguide. A triplexer platform can be provided by optically coupling photo-detectors to two output ports, which receive wavelength channels demultiplexed from an input signal by two cladding etched filters, and by optically coupling a laser to another input port, which launches an outgoing laser signal at the endwall etched grating filter for coupling into the same fiber that launched the original input signal.
    Type: Application
    Filed: March 23, 2007
    Publication date: October 4, 2007
    Inventors: Serge Bidnyk, Ashok Balakrishnan, Matt Pearson
  • Patent number: 7209612
    Abstract: The invention relates to a planar lightwave circuit including a two stage optical filter for use in a bi-directional transceiver. A first stage includes a non-dispersive optical filter, which enables light within in a certain wavelength range, e.g. a signal channel from a laser source, to be launched onto an input/output waveguide, while light within another wavelength range, e.g. one or more detector channels, will be directed from the input/output waveguide to a second stage. The second stage includes a reflective diffraction grating with a higher resolution than the first stage providing passbands 2 to 5 times thinner than the first stage.
    Type: Grant
    Filed: June 1, 2005
    Date of Patent: April 24, 2007
    Assignee: Enablence Inc.
    Inventors: Ashok Balakrishnan, Serge Bidnyk, Matt Pearson
  • Patent number: 7151635
    Abstract: The invention relates to a planar waveguide reflective diffraction grating for use in an optical device, such as a wavelength division multiplexer, providing an increased bandwidth over conventional planar waveguide reflection diffraction gratings while eliminating the polarization dependent loss (PDL) typically associated therewith. Accordingly, a low order (<3), high aspect ratio (>10) grating is provided with a very short side wall (less than the wavelength of the optical signal) for use with incident angles of less than 15°.
    Type: Grant
    Filed: October 25, 2004
    Date of Patent: December 19, 2006
    Assignee: Enablence, Inc.
    Inventors: Serge Bidnyk, Ashok Balakrishnan, Matt Pearson
  • Patent number: 7149387
    Abstract: The invention relates to a double-grating subtractive-dispersion optical channel multiplexer/demultiplexer for combining or separating optical channels and providing the output channels with a flat-top response. The FSR of the first grating is substantially equal to the channel spacing of the optical channels, such that the emission from the first grating achieves a cyclic offset of incidence angle into the second grating of the system.
    Type: Grant
    Filed: June 1, 2005
    Date of Patent: December 12, 2006
    Assignee: Enablence Inc.
    Inventors: Ashok Balakrishnan, Serge Bidnyk, Matt Pearson
  • Patent number: 7068885
    Abstract: The invention relates to a planar lightwave circuit including a pair of opposed concave reflective diffraction gratings sharing the same focal line, which separates first and second slab waveguide regions. The ends of input and output waveguides are positioned along the focal line for launching and receiving light directed by one or both of the diffraction gratings. The invention enables light within in a certain wavelength range to be launched from an input waveguide, directed by a single diffraction grating, and output waveguides, all within a single slab waveguide region, while light within another wavelength range will be directed from one diffraction grating to another for output waveguides in a different slab waveguide region.
    Type: Grant
    Filed: August 24, 2004
    Date of Patent: June 27, 2006
    Assignee: Enablence, Inc.
    Inventors: Serge Bidnyk, Ashok Balakrishnan, Matt Pearson
  • Publication number: 20060119945
    Abstract: Diffraction gratings are formed from grooves each having a reflective facet and a non-reflective facet. The net reflection of TE (Transverse Electric) and TM (Transverse Magnetic) polarizations from the grating structure is traded off against the polarization dependent reflection, by controlling the degree of metallization of the reflective facet and by ensuring that there is no metallization of non-reflective sidewalls. other diffraction gratings are manufactured from trenches etched perpendicular to a waveguide. The trenches are metallized and back-filled with a filling material having a refractive index matched to that of the waveguide. The gratings essentially have no non-reflecting sidewalls with insignificant polarization influence from side walls.
    Type: Application
    Filed: August 26, 2003
    Publication date: June 8, 2006
    Inventors: Ashok Balakrishnan, Kokou Dossou, Muthukumaran Packirisamy