Christopher W Tischhauser

US Patent:

7679755, Mar 16, 2010

Filed:

Aug 28, 2008

Appl. No.:

12/200627

Inventors:

Christopher W. Tischhauser - San Mateo CA, US
James E. Mason - Palo Alto CA, US

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

G01B 9/02
G02B 27/10

US Classification:

356519, 356491, 359618

Abstract:

Optical filters tunable for both center wavelength and bandwidth, having applications such as in astronomy, remote sensing, laser spectroscopy, and other laser-based sensing applications, using Michelson interferometers or Mach-Zehnder interferometers modified with Gires-Tournois interferometers (“GTIs”) are disclosed. A GTI nominally has unity magnitude reflectance as a function of wavelength and has a phase response based on its resonator characteristics. Replacing the end mirrors of a Michelson interferometer or the fold mirrors of a Mach-Zehnder interferometer with GTIs results in both high visibility throughput as well as the ability to tune the phase response characteristics to change the width of the bandpass/notch filters. A range of bandpass/bandreject optical filter modes, including a Fabry-Perot (“FP”) mode, a wideband, low-ripple FP mode, a narrowband notch/bandpass mode, and a wideband notch/bandpass mode, are all tunable and wavelength addressable.

US Patent:

7880968, Feb 1, 2011

Filed:

Jan 27, 2010

Appl. No.:

12/695117

Inventors:

Christopher W. Tischhauser - San Mateo CA, US
James E. Mason - Palo Alto CA, US

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

G01B 9/02
G02B 27/10

US Classification:

359618, 356519

Abstract:

Optical filters tunable for both center wavelength and bandwidth, having applications such as in astronomy, remote sensing, laser spectroscopy, and other laser-based sensing applications, using Michelson interferometers or Mach-Zehnder interferometers modified with Gires-Tournois interferometers (“GTIs”) are disclosed. A GTI nominally has unity magnitude reflectance as a function of wavelength and has a phase response based on its resonator characteristics. Replacing the end mirrors of a Michelson interferometer or the fold minors of a Mach-Zehnder interferometer with GTIs results in both high visibility throughput as well as the ability to tune the phase response characteristics to change the width of the bandpass/notch filters. A range of bandpass/bandreject optical filter modes, including a Fabry-Perot (“FP”) mode, a wideband, low-ripple FP mode, a narrowband notch/bandpass mode, and a wideband notch/bandpass mode, are all tunable and wavelength addressable.

US Patent:

7952807, May 31, 2011

Filed:

Dec 22, 2010

Appl. No.:

12/976939

Inventors:

Christopher W. Tischhauser - San Mateo CA, US
James E. Mason - Palo Alto CA, US

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

G01B 9/02
G02B 27/10

US Classification:

359618, 356519

Abstract:

Optical filters tunable for both center wavelength and bandwidth, having applications such as in astronomy, remote sensing, laser spectroscopy, and other laser-based sensing applications, using Michelson interferometers or Mach-Zehnder interferometers modified with Gires-Tournois interferometers (“GTIs”) are disclosed. A GTI nominally has unity magnitude reflectance as a function of wavelength and has a phase response based on its resonator characteristics. Replacing the end mirrors of a Michelson interferometer or the fold mirrors of a Mach-Zehnder interferometer with GTIs results in both high visibility throughput as well as the ability to tune the phase response characteristics to change the width of the bandpass/notch filters. A range of bandpass/bandreject optical filter modes, including a Fabry-Perot (“FP”) mode, a wideband, low-ripple FP mode, a narrowband notch/bandpass mode, and a wideband notch/bandpass mode, are all tunable and wavelength addressable.

US Patent:

7433054, Oct 7, 2008

Filed:

Aug 7, 2006

Appl. No.:

11/499725

Inventors:

Christopher W. Tischhauser - San Mateo CA, US
James E. Mason - Palo Alto CA, US

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

G01B 9/02
G02B 27/10

US Classification:

356519, 359618

Abstract:

Optical filters tunable for both center wavelength and bandwidth, having applications such as in astronomy, remote sensing, laser spectroscopy, and other laser-based sensing applications, using Michelson interferometers or Mach-Zehnder interferometers modified with Gires-Tournois interferometers (“GTIs”) are disclosed. A GTI nominally has unity magnitude reflectance as a function of wavelength and has a phase response based on its resonator characteristics. Replacing the end mirrors of a Michelson interferometer or the fold mirrors of a Mach-Zehnder interferometer with GTIs results in both high visibility throughput as well as the ability to tune the phase response characteristics to change the width of the bandpass/notch filters. A range of bandpass/bandreject optical filter modes, including a Fabry-Perot (“FP”) mode, a wideband, low-ripple FP mode, a narrowband notch/bandpass mode, and a wideband notch/bandpass mode, are all tunable and wavelength addressable.

US Patent:

20180026721, Jan 25, 2018

Filed:

Jul 22, 2016

Appl. No.:

15/217833

Inventors:

- Bethesda MD, US
Patrick Eliot PERKINS - Woodside CA, US
Christopher William TISCHHAUSER - Campbell CA, US
Danielle Marie Rawles WUCHENICH - Palo Alto CA, US

International Classification:

H04B 10/40
H04B 10/64
H04B 10/548
H04B 10/11

Abstract:

A phased-array coherent transceiver system includes a transceiver array including multiple receive (RX) optical elements, a number of RX optical fibers, and an optical receiver. The RX optical elements are coupled to the optical receiver via the RX optical fibers. The optical receiver includes multiple phase modulators, each phase modulator processes a phase of an optical signal received from an RX optical element.

US Patent:

20180013497, Jan 11, 2018

Filed:

Jul 7, 2016

Appl. No.:

15/204898

Inventors:

- Bethesda MD, US
Patrick Eliott PERKINS - Woodside CA, US
Christopher William TISCHHAUSER - Campbell CA, US

International Classification:

H04B 10/64
H04B 10/11
H04B 10/40
H04B 10/61

Abstract:

A coherent transceiver system includes a local oscillator (LO) light source to generate an LO optical signal. An adaptive fiber array is coupled to the LO light source to dephase the LO optical signal. A balanced detector is coupled to the adaptive fiber array to receive a dephased LO signal from the adaptive fiber array and an optical input signal and to generate a heterodyne signal. A controller receives the heterodyne signal and generates one or more control signals. The adaptive fiber array utilizes the control signals to dephase the LO optical signal.