Patents by Inventor John N. Hait

John N. Hait 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: 20030072051
    Abstract: Delay domain multiplexing, differing from coherence multiplexing of digital data signals, may use orthogonal encoding to reduce cross-channel interference compared to traditional techniques. A plurality of photonic encoders may receive laser pulses from a laser pulse source, converting the pulses into n sets of orthogonal codes, such as Walsh codes, depending on the number of channels to be multiplexed. A passive apparatus may use orthogonal codes, creating them fast enough to function in an optical or photonic environment. The orthogonal codes may subsequently be modulated with n digital data signals before being multiplexed and demultiplexed in a delay domain or coherence multiplexing apparatus. At a receiver, the encoded signals are decoded and the original digital data signals are extracted therefrom.
    Type: Application
    Filed: June 13, 2001
    Publication date: April 17, 2003
    Inventors: Michael H. Myers, Clark C. Guest, John N. Hait, Peter D. Sahagen
  • Publication number: 20020181038
    Abstract: A particular signal from a legacy photonic source may have a distribution of wavelengths in a particular signal that is excessively broad for modem, narrowband equipment. In order to provide a drop-in apparatus for integrating modem narrowband signal carrying and handling devices with legacy equipment as either sender or receiver, various implementations of a data stabilizer are provided. Data stabilizers may rely on information transfer mechanisms, signal directors, wavelength shifters, cross-gain modulation, cross-phase modulation, and four-wave mixers. Moreover, data stabilizers may be implemented directly as multiplexers, or integrated into systems using conventional multiplexers.
    Type: Application
    Filed: June 1, 2001
    Publication date: December 5, 2002
    Inventors: John N. Hait, Arkady S. Bablumyan
  • Patent number: 6477287
    Abstract: A polarization insensitive photonic information router that can use polarization sensitive switches is disclosed. A photonic input signal is polarization separated into two paths having mutually orthogonal fixed polarizations and complementary amplitude fluctuations in accordance with polarization fluctuations of the input signal. Duplicate-acting switches, one for each fixed polarization, produce switched, polarized signal pairs. These are connected so as to recombine energy from both polarization contributions in each of the switched outputs. Recombining can standardize output polarizations, or reproduce the input polarization fluctuations. Polarization stabilization can also be used before switching. Decoding packet data to operate the switch produces a polarization insensitive packet switching router.
    Type: Grant
    Filed: October 2, 2000
    Date of Patent: November 5, 2002
    Inventor: John N. Hait
  • Patent number: 6473222
    Abstract: Multi-domain, phase-compensated, differential-coherence detection of photonic signals for interferometric processes and devices may be manufactured holographically and developed in situ or with an automatic registration between holograms and photonic sources in a single frame. Photonic or electronic post processing may include outputs from a cycling or rotation between differently phased complementary outputs of constructive and destructive interference. A hyper-selective, direct-conversion, expanded-bandpass filter may rely on an expanded bandpass for ease of filtering, with no dead zones for zero beat frequency cases. A hyper-heterodyning, expanded bandpass system may also provide improved filtering and signal-to-noise ratios. An ultra-high-resolution, broadband spectrum analyzer may operate in multiple domains, including complex “fingerprints” of phase, frequency, and other parameters.
    Type: Grant
    Filed: December 27, 2000
    Date of Patent: October 29, 2002
    Inventors: John N. Hait, Robert L. Carter, Ronald E. Preston
  • Patent number: 6462877
    Abstract: A method and apparatus for hyper-dense communications provides a photonic signal, such as an optical or radio frequency signal produced with substantially reduced sidebands. Signals may be filtered photonically, such as by a photonic transistor or photonic drop filter, to remove such frequency components. The resulting bandwidth of the photonic output signal is narrower in the photonic domain than the bandwidth of the information it carries in the original domain of the information. This hyper-dense signal is then transmitted and received. Such signals retain their reduced spectral distributions while in the photonic domain. Upon reception and conversion into electronic form, the full spectrum of the original information may be restored, including the sidebands, by passing the transmitted signal through a non-linear device.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: October 8, 2002
    Inventor: John N. Hait
  • Patent number: 6459827
    Abstract: A polarization insensitive photonic information router that can use polarization sensitive switches is disclosed. A photonic input signal is polarization separated into two paths having mutually orthogonal fixed polarizations and complementary amplitude fluctuations in accordance with polarization fluctuations of the input signal. Duplicate-acting switches, one for each fixed polarization, produce switched, polarized signal pairs. These are connected so as to recombine energy from both polarization contributions in each of the switched outputs. Recombining can standardize output polarizations, or reproduce the input polarization fluctuations. Polarization stabilization can also be used before switching. Decoding packet data to operate the switch produces a polarization insensitive packet switching router.
    Type: Grant
    Filed: October 2, 2000
    Date of Patent: October 1, 2002
    Inventor: John N. Hait
  • Publication number: 20020131134
    Abstract: A method and apparatus for hyper-dense communications provides a photonic signal, such as an optical or radio frequency signal produced with substantially reduced sidebands. Signals may be filtered photonically, such as by a photonic transistor or photonic drop filter, to remove such frequency components. The resulting bandwidth of the photonic output signal is narrower in the photonic domain than the bandwidth of the information it carries in the original domain of the information. This hyper-dense signal is then transmitted and received. Such signals retain their reduced spectral distributions while in the photonic domain. Upon reception and conversion into electronic form, the full spectrum of the original information may be restored, including the sidebands, by passing the transmitted signal through a non-linear device.
    Type: Application
    Filed: March 16, 2001
    Publication date: September 19, 2002
    Inventor: John N. Hait
  • Publication number: 20020131107
    Abstract: A method and apparatus for hyper-dense communications provides a photonic signal, such as an optical or radio frequency signal produced with substantially reduced sidebands. Signals may be filtered photonically, such as by a photonic transistor or photonic drop filter, to remove such frequency components. The resulting bandwidth of the photonic output signal is narrower in the photonic domain than the bandwidth of the information it carries in the original domain of the information. This hyper-dense signal is then transmitted and received. Such signals retain their reduced spectral distributions while in the photonic domain. Upon reception and conversion into electronic form, the full spectrum of the original information may be restored, including the sidebands, by passing the transmitted signal through a non-linear device.
    Type: Application
    Filed: March 16, 2001
    Publication date: September 19, 2002
    Inventor: John N. Hait
  • Publication number: 20020130251
    Abstract: An apparatus and method for detecting photonic wavelength errors is described. A photonic signal comprised of one or more channels is received. The photonic signal is wavelength shifted by a pair of wavelength shifters with slightly offset shift values to provide a pair of photonic signals with slightly offset wavelengths. The pair of photonics signals is filtered and differentially compared to provide a wavelength error signal.
    Type: Application
    Filed: March 16, 2001
    Publication date: September 19, 2002
    Inventors: Michael H. Myers, John N. Hait, Steven McDaniel
  • Publication number: 20020131108
    Abstract: A method and apparatus for hyper-dense communications provides a photonic signal, such as an optical or radio frequency signal produced with substantially reduced sidebands. Signals may be filtered photonically, such as by a photonic transistor or photonic drop filter, to remove such frequency components. The resulting bandwidth of the photonic output signal is narrower in the photonic domain than the bandwidth of the information it carries in the original domain of the information. This hyper-dense signal is then transmitted and received. Such signals retain their reduced spectral distributions while in the photonic domain. Upon reception and conversion into electronic form, the full spectrum of the original information may be restored, including the sidebands, by passing the transmitted signal through a non-linear device.
    Type: Application
    Filed: August 3, 2001
    Publication date: September 19, 2002
    Inventor: John N. Hait
  • Publication number: 20020131100
    Abstract: Detecting photonic wavelength errors relies on wavelength shifting a photonic signal comprised of one or more channels. The photonic signal is wavelength shifted by slightly offset shift values to provide a pair of photonic signals with slightly offset wavelengths. The pair of photonics signals is filtered and differentially compared to provide a wavelength error signal.
    Type: Application
    Filed: September 13, 2001
    Publication date: September 19, 2002
    Inventors: Michael H. Myers, John N. Hait, Steven F. McDaniel
  • Publication number: 20020131112
    Abstract: A method and apparatus for hyper-dense communications provides a photonic signal, such as an optical or radio frequency signal produced with substantially reduced sidebands. Signals may be filtered photonically, such as by a photonic transistor or photonic drop filter, to remove such frequency components. The resulting bandwidth of the photonic output signal is narrower in the photonic domain than the bandwidth of the information it carries in the original domain of the information. This hyper-dense signal is then transmitted and received. Such signals retain their reduced spectral distributions while in the photonic domain. Upon reception and conversion into electronic form, the full spectrum of the original information may be restored, including the sidebands, by passing the transmitted signal through a non-linear device.
    Type: Application
    Filed: September 14, 2001
    Publication date: September 19, 2002
    Inventor: John N. Hait
  • Publication number: 20020131109
    Abstract: A method and apparatus for hyper-dense communications provides a photonic signal, such as an optical or radio frequency signal produced with substantially reduced sidebands. Signals may be filtered photonically, such as by a photonic transistor or photonic drop filter, to remove such frequency components. The resulting bandwidth of the photonic output signal is narrower in the photonic domain than the bandwidth of the information it carries in the original domain of the information. This hyper-dense signal is then transmitted and received. Such signals retain their reduced spectral distributions while in the photonic domain. Upon reception and conversion into electronic form, the full spectrum of the original information may be restored, including the sidebands, by passing the transmitted signal through a non-linear device.
    Type: Application
    Filed: August 3, 2001
    Publication date: September 19, 2002
    Inventor: John N. Hait
  • Publication number: 20020130254
    Abstract: A method and apparatus for hyper-dense communications provides a photonic signal, such as an optical or radio frequency signal produced with substantially reduced sidebands. Signals may be filtered photonically, such as by a photonic transistor or photonic drop filter, to remove such frequency components. The resulting bandwidth of the photonic output signal is narrower in the photonic domain than the bandwidth of the information it carries in the original domain of the information. This hyper-dense signal is then transmitted and received. Such signals retain their reduced spectral distributions while in the photonic domain. Upon reception and conversion into electronic form, the full spectrum of the original information may be restored, including the sidebands, by passing the transmitted signal through a non-linear device.
    Type: Application
    Filed: March 16, 2001
    Publication date: September 19, 2002
    Inventor: John N. Hait
  • Publication number: 20020131111
    Abstract: A method and apparatus for hyper-dense communications provides a photonic signal, such as an optical or radio frequency signal produced with substantially reduced sidebands. Signals may be filtered photonically, such as by a photonic transistor or photonic drop filter, to remove such frequency components. The resulting bandwidth of the photonic output signal is narrower in the photonic domain than the bandwidth of the information it carries in the original domain of the information. This hyper-dense signal is then transmitted and received. Such signals retain their reduced spectral distributions while in the photonic domain. Upon reception and conversion into electronic form, the full spectrum of the original information may be restored, including the sidebands, by passing the transmitted signal through a non-linear device.
    Type: Application
    Filed: September 14, 2001
    Publication date: September 19, 2002
    Inventor: John N. Hait
  • Publication number: 20020131110
    Abstract: A method and apparatus for hyper-dense communications provides a photonic signal, such as an optical or radio frequency signal produced with substantially reduced sidebands. Signals may be filtered photonically, such as by a photonic transistor or photonic drop filter, to remove such frequency components. The resulting bandwidth of the photonic output signal is narrower in the photonic domain than the bandwidth of the information it carries in the original domain of the information. This hyper-dense signal is then transmitted and received. Such signals retain their reduced spectral distributions while in the photonic domain. Upon reception and conversion into electronic form, the full spectrum of the original information may be restored, including the sidebands, by passing the transmitted signal through a non-linear device.
    Type: Application
    Filed: September 14, 2001
    Publication date: September 19, 2002
    Inventor: John N. Hait
  • Publication number: 20020131133
    Abstract: A method and apparatus for hyper-dense communications provides a photonic signal, such as an optical or radio frequency signal produced with substantially reduced sidebands. Signals may be filtered photonically, such as by a photonic transistor or photonic drop filter, to remove such frequency components. The resulting bandwidth of the photonic output signal is narrower in the photonic domain than the bandwidth of the information it carries in the original domain of the information. This hyper-dense signal is then transmitted and received. Such signals retain their reduced spectral distributions while in the photonic domain. Upon reception and conversion into electronic form, the full spectrum of the original information may be restored, including the sidebands, by passing the transmitted signal through a non-linear device.
    Type: Application
    Filed: March 16, 2001
    Publication date: September 19, 2002
    Inventor: John N. Hait
  • Publication number: 20020131057
    Abstract: An apparatus and method are provided to spatially multiplex information into a rainbow spectrum by filtering out certain frequencies or colors of the spectrum. The frequencies that are filtered or blocked out may depend on a value of a system input such as a level indicator, temperature gauge, pressure indicator, and the like. The spectrum, absent the filtered out frequencies, is sequentially focused into a single composite beam for transport through an optical path or fiber. Upon arrival to a destination, the composite beam is spatially separated into the original rainbow spectrum and projected onto a display. A viewer may subsequently view the spectrum and any dark areas within the spectrum associated with filtered or blocked frequencies and may, therefore, monitor a remotely located system.
    Type: Application
    Filed: March 16, 2001
    Publication date: September 19, 2002
    Inventors: Michael V. Lee, John N. Hait
  • Patent number: 6427033
    Abstract: A polarization insensitive photonic information router that can use polarization sensitive switches is disclosed. A photonic input image is polarization separated into two paths having mutually orthogonal fixed polarizations and complementary amplitude fluctuations in accordance with polarization fluctuations of the input image. Duplicate-acting switches, one for each fixed polarization, produce switched, polarized image pairs. These are connected so as to recombine energy from both polarization contributions in each of the switched outputs. Recombining can standardize output polarizations, or reproduce the input polarization fluctuations. Polarization stabilization can also be used before switching. Decoding packet data to operate the switch produces a polarization insensitive packet switching router.
    Type: Grant
    Filed: October 2, 2000
    Date of Patent: July 30, 2002
    Inventor: John N. Hait
  • Publication number: 20020085207
    Abstract: Multi-domain, phase-compensated, differential-coherence detection of photonic signals for interferometric processes and devices may be manufactured holographically and developed in situ or with an automatic registration between holograms and photonic sources in a single frame. Photonic or electronic post processing may include outputs from a cycling or rotation between differently phased complementary outputs of constructive and destructive interference. A hyper-selective, direct-conversion, expanded-bandpass filter may rely on an expanded bandpass for ease of filtering, with no dead zones for zero beat frequency cases. A hyper-heterodyning, expanded bandpass system may also provide improved filtering and signal-to-noise ratios. An ultra-high-resolution, broadband spectrum analyzer may operate in multiple domains, including complex “fingerprints” of phase, frequency, and other parameters.
    Type: Application
    Filed: December 27, 2000
    Publication date: July 4, 2002
    Inventors: John N. Hait, Maran C. Pate