JACK FU
Broker in Boston, MA
License number
Massachusetts 9006987
Issued Date
Apr 14, 1994
Expiration Date
Sep 21, 2000
Type
Salesperson
Address
Address
Boston, MA 02135
Professional information
Independent Computer Software Professional
Location:
Greater Boston Area
Industry:
Computer Software
Jack Fu
Location:
Greater Boston Area
Industry:
Computer Networking
Photorefractive Limiting Quadratic Processor
US Patent:
5594586, Jan 14, 1997
Filed:
May 2, 1994
Appl. No.:
8/236936
Inventors:
Jehad Khoury - Arlington MA
Charles L. Woods - Stow MA
Mark Cronin-Golomb - Reading MA
Jack Fu - Brighton MA
Charles L. Woods - Stow MA
Mark Cronin-Golomb - Reading MA
Jack Fu - Brighton MA
Assignee:
The United States of America as represented by the Secretary of the Air
Force - Washington DC
Force - Washington DC
International Classification:
G02B 2746, G02B 523
US Classification:
359559
Abstract:
Limiting quadratic processing and compansion in photorefractive two beam coupling is disclosed. Two-beam coupling in photorefractive barium titanate employs the imaged intensity of the signal to amplify the reference beam while maintaining the phase of the reference beam. The phase distorted signal beam is converted to that of the controlled phase of the reference beam. The high pump limit of amplification in this two-beam coupling device produces an amplitude compressed output to reduce multiplicative noise. Lost contrast of the image is thereafter restored. Beam clean-up of a non-intelligence bearing beam can be carried out by a similar process; a low pass filter consisting of a pinhole plate can be used in place of the second photorefractive crystal in the Fourier plane and only the planar wavefront portion will pass through the pinhole and may be collimated by a lens to provide a cleaned planar output beam.
Pseudo Deconvolution Method Of Recovering A Distorted Optical Image
US Patent:
6229649, May 8, 2001
Filed:
Oct 4, 1994
Appl. No.:
8/319143
Inventors:
Charles L. Woods - Stow MA
Jehad Khoury - Concord NH
Jack Fu - Brighton MA
Jehad Khoury - Concord NH
Jack Fu - Brighton MA
Assignee:
The United States of America as represented by the Secretary of the Air
Force - Washington DC
Force - Washington DC
International Classification:
G02B 2746
US Classification:
359560
Abstract:
A first lens produces a Fourier transform of the wavefront distorted optical image at the Fourier transform plane. A phase encoded filter is positioned at the transform plane and a second filter is tandemly positioned with respect to the first filter, the second filter having a transmittance which is statistically similar to the reciprocal spatial frequency spectrum of the Fourier transform of the distortion function, to in turn produce an intermediate signal at the transform plane, which is now Fourier transformed by a second lens to recover the optical image having a substantially reduced degree of distortion.
Phase Coding Technique For One-Way Image Transmission Through An Aberrating Medium
US Patent:
5555128, Sep 10, 1996
Filed:
Oct 4, 1994
Appl. No.:
8/319144
Inventors:
Jehad Khoury - Concord NH
Charles L. Woods - Stow MA
Jack Fu - Brighton MA
Charles L. Woods - Stow MA
Jack Fu - Brighton MA
Assignee:
The United States of America as represented by the Secretary of the Air
Force - Washington DC
Force - Washington DC
International Classification:
G03H 108, G03H 116
US Classification:
359559
Abstract:
An object beam is passed through an aberrating medium to produce a diffraction distorted image therein, which is imaged upon a spatial light modulator. A probe beam measures the phase aberrated wavefront within the aberrating medium and is used to produce an interference pattern which is employed to produce phase encoding signals to be fed back to the spatial light modulator for compensating in part for the phase distortion of the phase aberrated wavefront. The result is an output image having a substantially reduced degree of distortion.