Patents by Inventor Joshua E. Rothenberg

Joshua E. Rothenberg 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: 6707967
    Abstract: Techniques for designing efficient gratings with multiple frequency response channels based on sampled patterns based predominantly on phase modulation of the underlying grating structure. Each period of the phase sampled patterns may include contiguous, discrete phase segments with different phase values, or alternatively, a continuous spatial phase pattern that changes the phase of the underlying grating structure. Moderate amplitude modulation of the underlying grating structure by the sampling structure may also be used together with phase modulation. The grating period or the sampling period may be chirped.
    Type: Grant
    Filed: January 8, 2001
    Date of Patent: March 16, 2004
    Assignee: Teraxion Inc.
    Inventors: Joshua E. Rothenberg, Hongpu Li, Yao Li, Jason Zweiback, Jan Popelek
  • Patent number: 6654521
    Abstract: The present invention is directed to a system and method for designing efficient multi-channel FBG gratings using a pre-compensated phase mask for diffracting light for side-writing the grating on an optical fiber core. A desired phase function of the FBG is generated, specifically tailored to an effective spacing between the phase mask and the optical fiber core. From the phase function a phase mask is pre-compensated to offset diffraction effects associated with each longitudinal position of the FBG receiving light from two corresponding longitudinal positions of the phase mask substantially symmetrically spaced longitudinally relative to each particular longitudinal position of the FBG. The two corresponding longitudinal positions of the phase mask are spaced longitudinally from each other by a spacing determined by the effective spacing between the phase mask and fiber core and by the first order diffraction angle of light through the phase mask.
    Type: Grant
    Filed: January 23, 2002
    Date of Patent: November 25, 2003
    Assignee: Teraxion Inc.
    Inventors: Yunlong Sheng, Joshua E. Rothenberg, HongPu Li, Ying Wang, Jason Zweiback
  • Patent number: 6647180
    Abstract: Techniques and designs for producing tunable optical dispersion by using two fiber Bragg gratings with nonlinear group delays to sequentially reflect an input optical signal and by tuning at least one of the fiber Bragg gratings.
    Type: Grant
    Filed: April 3, 2001
    Date of Patent: November 11, 2003
    Assignee: Teraxion Inc.
    Inventor: Joshua E. Rothenberg
  • Publication number: 20030138206
    Abstract: The present invention is directed to a system and method for designing efficient multi-channel FBG gratings using a pre-compensated phase mask for diffracting light for side-writing the grating on an optical fiber core. A desired phase function of the FBG is generated, specifically tailored to an effective spacing between the phase mask and the optical fiber core. From the phase function a phase mask is pre-compensated to offset diffraction effects associated with each longitudinal position of the FBG receiving light from two corresponding longitudinal positions of the phase mask substantially symmetrically spaced longitudinally relative to each particular longitudinal position of the FBG. The two corresponding longitudinal positions of the phase mask are spaced longitudinally from each other by a spacing determined by the effective spacing between the phase mask and fiber core and by the first order diffraction angle of light through the phase mask.
    Type: Application
    Filed: January 23, 2002
    Publication date: July 24, 2003
    Inventors: Yunlong Sheng, Joshua E. Rothenberg, HongPu Li, Ying Wang, Jason Zweiback
  • Publication number: 20030086646
    Abstract: Techniques for designing efficient gratings with multiple frequency response channels based on sampled patterns based predominantly on phase modulation of the underlying grating structure. Each period of the phase sampled patterns may include contiguous, discrete phase segments with different phase values, or alternatively, a continuous spatial phase pattern that changes the phase of the underlying grating structure. Moderate amplitude modulation of the underlying grating structure by the sampling structure may also be used together with phase modulation. The grating period or the sampling period may be chirped.
    Type: Application
    Filed: January 8, 2001
    Publication date: May 8, 2003
    Inventors: Joshua E. Rothenberg, Hongpu Li, Yao Li, Jason Zweiback, Jan Popelek
  • Publication number: 20030086647
    Abstract: Techniques, devices, and systems for generating tunable dispersions to control or compensate for dispersions in optical signals by using wave-guiding grating elements with nonlinear group delays.
    Type: Application
    Filed: June 13, 2002
    Publication date: May 8, 2003
    Inventors: Alan E. Willner, Yong-Won Song, Joshua E. Rothenberg, S.M. Reza Motaghian Nezam
  • Patent number: 6532074
    Abstract: Techniques for optically evaluating phase masks for fabricating waveguide Bragg gratings by measuring diffraction orders.
    Type: Grant
    Filed: May 30, 2001
    Date of Patent: March 11, 2003
    Assignee: Teraxion Inc.
    Inventors: Russell Wilcox, Jason Zweiback, HongPu Li, Jan Popelek, Joshua E. Rothenberg
  • Publication number: 20020122626
    Abstract: The invention provides masks that form fiber Bragg gratings (FBGs) in optical fibers without stitching errors from re-scaling or re-positioning. The invention feathers the pixels of the mask lines by adding, removing, and/or displacing one or more pixels from the edges of the bars and spaces of the mask. The feathering of pixels will affect the FBG being written into the fiber. The feathering operates to shift the effective edge of the bars. This allows the achievement of much finer resolution FBGs than the pixel size of the mask.
    Type: Application
    Filed: June 15, 2001
    Publication date: September 5, 2002
    Inventors: Joshua E. Rothenberg, Yunlong Sheng
  • Publication number: 20020102055
    Abstract: The invention reduces the effects of stitching errors from re-scaling or re-positioning in the fabrication of fiber Bragg gratings or the mask used in such fabrication. A first embodiment of the invention preferably uses characteristics of stitching errors to compensate for the stitching errors themselves. By increasing the number of stitching errors, errors caused by the stitching errors can be reduced. A second embodiment uses continuous writing of the desired pattern, wherein the desired pattern is snapped to a grid that can be written by the fabrication equipment. Using continuous writing eliminates stitching errors in the resulting gratings.
    Type: Application
    Filed: September 18, 2001
    Publication date: August 1, 2002
    Inventors: Jason Zweiback, Joshua E. Rothenberg, Jan Popelek, Roger F. Caldwell
  • Publication number: 20020094165
    Abstract: Techniques and designs for producing tunable optical dispersion by using two fiber Bragg gratings with nonlinear group delays to sequentially reflect an input optical signal and by tuning at least one of the fiber Bragg gratings.
    Type: Application
    Filed: April 3, 2001
    Publication date: July 18, 2002
    Inventor: Joshua E. Rothenberg