Patents by Inventor Steven C. Dohmeier
Steven C. Dohmeier 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: 6999663Abstract: An improved fiber optic tap monitor has characteristics that are flatter over the wavelength range of interest. The polarization dependence of the characteristics of the tap monitor is reduced, and the package for the tap monitor is smaller. The tap monitor reduces the amount of light reflected back to the source. The tap monitor is also assembled in a manner to improve temperature stability, so that its characteristics over a range of temperatures are more nearly constant.Type: GrantFiled: October 31, 2001Date of Patent: February 14, 2006Assignee: ADC Telecommunications, Inc.Inventors: Edward C. Gage, Steven C. Dohmeier, Ronald E. Gerber, Craig A. Parsons, Thomas J. Schmitt, Eric K. Lindmark, John C. Holman, Kevin D. Batko, Timothy S. Gardner
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Publication number: 20040156596Abstract: An improved fiber optic tap monitor has characteristics that are flatter over the wavelength range of interest. The tap monitor includes a filter that reflects a major fraction of the light from a first fiber to a second fiber. A photodetector located behind the filter detects the light transmitted by the filter. The reflectance spectrum of the filter is selected to compensate for nonuniformities in the detection response characteristic of the photodetector over the wavelength range of interest, so that the overall response of the tap monitor is relatively flat.Type: ApplicationFiled: September 5, 2003Publication date: August 12, 2004Applicant: ADC Telecommunications, Inc.Inventors: Craig A. Parsons, Steven C. Dohmeier, Timothy S. Gardner, Edward C. Gage, Ye Feng
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Publication number: 20030081901Abstract: An improved fiber optic tap monitor has characteristics that are flatter over the wavelength range of interest. The polarization dependence of the characteristics of the tap monitor is reduced, and the package for the tap monitor is smaller. The tap monitor reduces the amount of light reflected back to the source. The tap monitor is also assembled in a manner to improve temperature stability, so that its characteristics over a range of temperatures are more nearly constant.Type: ApplicationFiled: October 31, 2001Publication date: May 1, 2003Applicant: ADC Telecommunications, Inc.Inventors: Edward C. Gage, Steven C. Dohmeier, Ronald E. Gerber, Craig A. Parsons, Thomas J. Schmitt, Eric K. Lindmark, John C. Holman, Kevin D. Batko, Timothy S. Gardner
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Patent number: 5903537Abstract: A recording apparatus and method are disclosed for forming marks on a recording medium. The recording apparatus includes an arrangement having an adjustable light source for producing a beam of light having first and second portions, with the second portion for recording marks on the medium, and an arrangement responsive to the first portion of the light beam and including a front facet detector positioned to receive the first portion of the light beam directly from the light source for producing a front facet signal. The recording apparatus also includes an arrangement for detecting light from the second portion of the light beam which is reflected from the medium and for producing a mark formation signal, and circuitry responsive to the front facet signal and the mark formation signal for producing a mark formation effectiveness signal.Type: GrantFiled: April 7, 1997Date of Patent: May 11, 1999Assignee: Eastman Kodak CompanyInventors: Edward C. Gage, Clarke K. Eastman, Roger A. Hajjar, Steven C. Dohmeier
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Patent number: 5828630Abstract: A magneto-optic head for reading and writing information on a magneto-optic recording medium so that diffraction effects can be monitored during writing is disclosed.Type: GrantFiled: May 7, 1997Date of Patent: October 27, 1998Assignee: Eastman Kodak CompanyInventors: Edward C. Gage, Clarke K. Eastman, Steven C. Dohmeier, James A. Barnard
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Patent number: 5809001Abstract: Apparatus for reading data from an optical medium having improved settling time characteristics and reduced bandwidth requirements is disclosed. The apparatus includes a front facet detector for producing a front facet monitor signal from a laser light beam; first and second detectors for producing first and second data signals, respectively; and a first gain control circuit responsive to the front facet monitor signal to produce a gain adjusted front facet monitor signal.Type: GrantFiled: November 7, 1996Date of Patent: September 15, 1998Assignee: Eastman Kodak CompanyInventors: Edward C. Gage, Steven C. Dohmeier, Mark V. Hettel
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Patent number: 5805536Abstract: A method for reading data from an optical medium having improved settling time characteristics and reduced bandwidth requirements, including producing a gain adjusted front facet monitor signal from a laser light beam, producing first and second data signals from data read from the medium, and producing first and second gain adjusted data signals in response to the gain adjusted front facet monitor signal and first and second data signals, respectively.Type: GrantFiled: November 7, 1996Date of Patent: September 8, 1998Assignee: Eastman Kodak CompanyInventors: Edward C. Gage, Steven C. Dohmeier, Mark V. Hettel
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Patent number: 5784348Abstract: An optical recording system for recording data on an optical medium comprising: an optical source capable of providing at least one write pulse incident upon the optical medium; a direct read during write (DRDW) verification and control system within the optical source having a capability of measuring light reflected from the optical medium into a return beam aperture, the DRDW system including a plurality of detectors configured to receive light from different areas of the return aperture; and a comparison circuit for comparing light received in different portions of the return aperture.Type: GrantFiled: June 19, 1996Date of Patent: July 21, 1998Assignee: Eastman Kodak CompanyInventors: Clarke K. Eastman, Roger A. Hajjar, Edward C. Gage, Steven C. Dohmeier
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Patent number: 5612938Abstract: Method for correcting the length of marks and lands representing information taken from an optical disk is disclosed. The method includes digitizing amplified analog data having marks and lands played back from an optical disk and providing a data synchronization clock by using a phase lock loop (PLL). The method further includes providing an adjustment to a threshold signal level based upon the difference in timing position in mark and land edge marks with reference to the data synchronization clock and changing the data mark and land lengths with reference to the adjusted threshold signal.Type: GrantFiled: April 20, 1995Date of Patent: March 18, 1997Assignee: Eastman Kodak CompanyInventors: Steven C. Dohmeier, Michael Meichle, Michael G. Fairchild
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Patent number: 5586101Abstract: An apparatus and method for detecting a data signal read from a magneto-optic (MO) storage medium. First and second detected signals are generated from first and second portions, respectively, of a radiation beam reflected from the medium. First and second gain control circuits are coupled to the first and second detectors, respectively. Each of the gain control circuits is operative to alter the gain of a signal path of the corresponding detected signal in response to a control signal which varies in accordance with a difference between the corresponding detected signal and a reference signal. The reference signals in each gain control circuit may be a common reference voltage level. A signal difference circuit produces a data signal corresponding to the difference between the detected signals.Type: GrantFiled: March 1, 1995Date of Patent: December 17, 1996Assignee: Eastman Kodak CompanyInventors: Edward C. Gage, Steven C. Dohmeier
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Patent number: 5537383Abstract: An apparatus and method for providing differential detection and source noise subtraction in data signals read from magneto-optic (MO), write-once (WO) or other types of optical storage media using an incident radiation beam. A source monitor signal is generated by detecting radiation from an optical source providing the radiation beam. An error detector generates an error signal corresponding to a difference between the source monitor signal and a reference signal. A power level of the radiation beam is adjusted in response to the error signal. A data signal generator is adapted to receive a return beam resulting from application of the radiation beam to the medium and to generate a WO data signal from the return beam. A signal combiner combines the data signal and the source monitor signal to provide a compensated WO data signal.Type: GrantFiled: March 1, 1995Date of Patent: July 16, 1996Assignee: Eastman Kodak CompanyInventors: Edward C. Gage, Steven C. Dohmeier
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Patent number: 5495466Abstract: An optical recording system and method which provide verification of recorded data, while the data is being written onto an optical recording medium, by detecting the rate of change of a reflected write pulse. The system includes an optical source for supplying a intensity-modulated incident write signal, having at least one write pulse, to an optical recording medium. The write signal records a logic level of the data on the medium as a mark having a distinct reflectivity. An optical detector detects a reflection of the incident write signal from the medium to provide a reflected write signal which includes a reflected write pulse corresponding to the incident write pulse. The reflected write pulse has a rate of change resulting from a change in reflectivity of the optical medium as the mark is formed thereon.Type: GrantFiled: January 10, 1994Date of Patent: February 27, 1996Assignee: Eastman Kodak CompanyInventors: Steven C. Dohmeier, Clarke K. Eastman, Jeffrey T. Klaus, Michael E. Meichle
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Patent number: 5491682Abstract: An apparatus and method for reducing optical source noise and other common-mode system noise in a data signal read from an optical storage medium. An exemplary apparatus in accordance with one aspect of the present invention includes a first detector to generate the data signal by detecting a return beam resulting from application of a radiation beam to the medium; a second detector to generate a source monitor signal by detecting radiation from an optical source providing the radiation beam; a correction circuit adapted to receive the data signal and the source monitor signal and generate a corrected data signal therefrom; and means for controlling the gain of a signal path of at least one of the data signal and the source monitor signal in response to, for example, low-frequency amplitude differences between the data signal and the source monitor signal. One or more delay lines may be included to provide phase matching of the data signal and source monitor signal at the correction circuit input.Type: GrantFiled: September 21, 1994Date of Patent: February 13, 1996Assignee: Eastman Kodak CompanyInventors: Steven C. Dohmeier, Edward C. Gage