Jack L Feinberg

US Patent:

6344298, Feb 5, 2002

Filed:

Aug 26, 1999

Appl. No.:

09/383332

Inventors:

Dmitry Starodubov - Los Angeles CA
Jack Feinberg - Manhattan Beach CA
Anton Skorucak - Studio City CA

Assignee:

Sabeus Photonics, Inc. - Long Beach CA

International Classification:

G03F 900

US Classification:

430 5, 2504921, 25049222, 385 37, 359573

Abstract:

A mask for forming gratings in an optical fiber has a pattern that is circumferentially varying about a central axis or region.

US Patent:

6453095, Sep 17, 2002

Filed:

Apr 6, 2001

Appl. No.:

09/827819

Inventors:

Kai-Ming Feng - Milpitas CA
Jin-Xing Cai - Ocean NJ
Alan E. Willner - Los Angeles CA
Victor Grubsky - Los Angeles CA
Dmitry Starodubov - Los Angeles CA
Jack Feinberg - Manhattan Beach CA

Assignee:

University of Southern California - Los Angeles CA

International Classification:

G02B 634

US Classification:

385 37, 385 24, 359130

Abstract:

Techniques and devices based on a wave-guiding element which has a spatial grating pattern that is an oscillatory variation along its optic axis. The wave-guiding element is configured to receive an input optical signal and to produce an output optical signal by reflection within a Bragg reflection band produced by the spatial grating pattern so as to produce time delays of different reflected spectral components as a nonlinear function of spatial positions along said optic axis at which the different reflected spectral components are respectively reflected. Such a wave-guiding element may be a nonlinearly chirped fiber grating A control unit may be engaged to the wave-guiding element and is operable to change a property of the spatial grating pattern along the optic axis to tune at least relative time delays of the different reflected spectral components nonlinearly with respect to wavelength.

US Patent:

47737190, Sep 27, 1988

Filed:

Jul 30, 1987

Appl. No.:

7/079800

Inventors:

Dana Z. Anderson - Boulder CO
Jack L. Feinberg - Manhattan Beach CA

International Classification:

G03H 102
G02B 2700

US Classification:

350 364

Abstract:

Changes in an image are detectable by a tracking novelty filter while an incorporated holographic medium is in disequilibrium. A suitably doped single-domain barium titanate crystal can serve as the holographic medium. Image information is imposed on a laser beam in the form of a spatially varying polarization across the beam cross section spatial position. The modulated beam is directed to the crystal, which cooperates with a polarizing beam splitter and a half wave plate to define a polarization conjugator. The conjugated beam is passed through the modulator a second time and then operated on by a beam splitter. When the crystal is in equilibrium with the incident laser light, the beam splitter directs minimal light to a detector. However, when an image change causes a change in the applied modulation, the changed image elements are intensified at the detector while the holographic medium is in disequilibrium. In alternative embodiments, phase is the variable modulated.

US Patent:

57456178, Apr 28, 1998

Filed:

Dec 30, 1996

Appl. No.:

8/775461

Inventors:

Dmitry S. Starodubov - Moscow, RU
Jack L. Feinberg - Manhattan Beach CA

Assignee:

D-STAR Technologies, LLC - Los Angeles CA

International Classification:

G02B 634

US Classification:

385 37

Abstract:

A grating is induced in the core of a hydrogen-loaded high-germanium-content optical fiber using near-UV (275 nm-390 nm) laser light. An interference pattern is generated at the core using a molded polymer phase mask with a square wave surface relief pattern. The light is directed through the phase mask, through a protective fiber coating, through the cladding, and into the core. The phase mask generates an interference pattern with a period half that of the surface relief pattern. Index of refraction changes occur at the bright fringes of the interference pattern--thus creating the grating. Advantages over existing mid-UV technology include lower fabrication costs for phase masks, simplified grating induction since fiber coatings do not need to be removed, and reduced infrared absorption caused by grating formation in the fiber.

US Patent:

46480927, Mar 3, 1987

Filed:

Sep 25, 1985

Appl. No.:

6/780057

Inventors:

Mark D. Ewbank - Newbury Park CA
Jack Feinberg - Manhattan Beach CA
Mohsen Khoshnevisan - Newbury Park CA
Pochi A. Yeh - Thousand Oaks CA

Assignee:

Rockwell International Corporation - El Segundo CA

International Classification:

H01S 3098

US Classification:

372 18

Abstract:

Laser energy is combined using dynamic beam splitters that can automatically accommodate changes in the laser cavity mode structure. Nonlinear optical methods and real time holography are employed to achieve phase locking among multiple lasers. A single laser output beam can be produced from a multitude of laser cavities which collectively contribute to the output power. No outside monitoring and servo mechanisms are required, since nonlinear optical processes automatically perform the functions of both monitoring and control. A coupled laser system includes two or more lasers, each laser having a resonant cavity, a laser gain medium in the resonant cavity, and a nonlinear optical element. Each nonlinear optical element is positioned in its respective resonant cavity to diffract laser energy from the cavity to a coupling beam by means of four-wave mixing (phase conjugation). Each cavity is coupled to another resonant cavity within the system by the coupling beams such that nonlinear optical interactions phase lock the outputs of all the lasers.

US Patent:

45008558, Feb 19, 1985

Filed:

Jun 10, 1982

Appl. No.:

6/387068

Inventors:

Jack Feinberg - Manhattan Beach CA

Assignee:

University of Southern California - Los Angeles CA

International Classification:

H01S 3098
H01S 323
H01S 330

US Classification:

332 751

Abstract:

An apparatus and method of producing a phase conjugate replica of a light beam involves internal reflection of the beam within a body of mixing material which lacks inversion symmetry. The orientation of the body relative to the incoming beam is adjusted such that at least one auxiliary beam splits off from the incoming beam, is internally reflected at least twice by the surface of the material and returns to the incoming beam within the material for scattering as an oppositely directed phase conjugate replica thereof.

US Patent:

59829630, Nov 9, 1999

Filed:

Feb 20, 1998

Appl. No.:

9/027345

Inventors:

Kai-Ming Feng - Alhambra CA
Jin-Xing Cai - Los Angeles CA
Alan Eli Willner - Los Angeles CA
Victor Grubsky - Los Angeles CA
Dmtry Starodubov - Los Angeles CA
Jack Feinberg - Manhattan Beach CA

Assignee:

University of Southern California - Los Angeles CA

International Classification:

G02B 634

US Classification:

385 37

Abstract:

A nonlinearly chirped fiber grating for achieving tunable dispersion compensation, chirp reduction in directly modulated diode lasers, and optical pulse manipulation. A dynamical dispersion compensation mechanism can be implemented in a fiber communication system based on such a nonlinearly chirped fiber grating.

US Patent:

57175160, Feb 10, 1998

Filed:

Apr 4, 1997

Appl. No.:

8/825835

Inventors:

Marvin B. Klein - Pacific Palisades CA
David M. Pepper - Malibu CA
Ronald R. Stephens - Westlake Village CA
Thomas R. O'Meara - Malibu CA
David Welch - Menlo Park CA
Robert J. Lang - Pleasanton CA
Jack L. Feinberg - Manhattan Beach CA
Stuart MacCormack - Venice CA

Assignee:

Hughes Electronics - Los Angeles CA
SDL, Inc. - San Jose CA

International Classification:

H01S 300
G02B 626

US Classification:

359334

Abstract:

An optical amplification system directs a diffraction-limited signal beam through a series of approximately 90. degree. crossings with a number of non-diffraction-limited pump beams in a photorefractive medium. All of the beams are s-polarized, resulting in an energy transfer from the pumps to the signal beam while leaving the signal beam diffraction-limited. The photorefractive medium is preferably a series of BaTiO. sub. 3 :Rh crystals that receive the pump and signal beams through orthogonal faces, with their C-axes at approximately 45. degree. to both beams. A binary tree optical distribution network is used to minimize waveguide splits in forming a large number of pump beams. The outputs of several amplification modules are combined into a single output beam using adaptive optics, with the outputs from the different modules phase matched to each other by diverting two minor portions of the combined beam, partially overlapping the diverted beams and adjusting the amplification module phases to cancel phase differentials between the overlapped portions. Similarly, sets of combined and phase-matched beams can be combined with each other (again using adaptive optics) to generate still higher powers using a super module approach.