Theodoor Damen

US Patent:

6356370, Mar 12, 2002

Filed:

Apr 24, 1998

Appl. No.:

09/066132

Inventors:

Theodoor Charlouis Damen - Colts Neck NJ
Jagdeep Shah - Holmdel Township, Monmouth County NJ
Masahiro Tsuchiya - Tokyo, JP

Assignee:

Agere Systems Optoelectronics Guardian Corp. - Orlando FL

International Classification:

H09J 1402

US Classification:

359134, 359326, 359127, 372 92

Abstract:

A new method and apparatus provide efficient highly non-degenerate four-wave mixing (FWM) signal in a semiconductor quantum well microcavity device. The phase mismatch between beam incidence angle and microcavity resonance frequency is minimized by using obliquely incident pump and probe beams. The FWM device is used to implement a wavelength multiplexer, a demultiplexer, a packet wavelength multiplexer, a packet demultiplexer, a time division multiplexer, a time division demultiplexer, a wavelength converter, and a wavelength switch.

US Patent:

56754361, Oct 7, 1997

Filed:

Apr 5, 1995

Appl. No.:

8/416610

Inventors:

Theodoor Charlouis Damen - Colts Neck NJ
Hailin Wang - Piscataway NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G02B 2746
G06K 900

US Classification:

359561

Abstract:

An optical image processor includes a nonlinear active gain medium for recording an interference pattern that corresponds to the Fourier transform of an input image or the multiplicative product of the Fourier transforms of two respective input images.

US Patent:

41287720, Dec 5, 1978

Filed:

Dec 29, 1977

Appl. No.:

5/865434

Inventors:

Tao-Yuan Chang - Lincroft NJ
Theodoor C. Damen - Colts Neck NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

H03F 700

US Classification:

307 883

Abstract:

A tunable far infrared generator makes use of a four-photon mixing process that cycles among highly excited atomic states, the lowest of which states is reached from the atomic ground state by a visible or ultraviolet photon, and the remainder of which states are connected by transitions in the infrared.

US Patent:

40933440, Jun 6, 1978

Filed:

Nov 5, 1976

Appl. No.:

5/739320

Inventors:

Theodoor Charlouis Damen - Colts Neck NJ
Erich Gornik - Red Bank NJ
Chandra Kumar Naranbhai Patel - Summit NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

B01F 101

US Classification:

350147

Abstract:

An optical polarization rotator is developed for use with infrared radiation using a nonlinear, two-photon interaction in a solid medium. The mechanism employed is resonance dispersion, where the sum frequency of an infrared beam to be rotated and a visible control beam is close to the frequency of a two-photon transition of exciton states, thereby producing different amounts of dispersion for the two orthogonal components of the linearly polarized infrared beam. The result of a phase difference between the two components is a rotation of the plane of polarization of the infrared beam.

US Patent:

45256870, Jun 25, 1985

Filed:

Dec 2, 1983

Appl. No.:

6/558545

Inventors:

Daniel S. Chemla - Rumson NJ
Theodoor C. Damen - Colts Neck NJ
Arthur C. Gossard - Warren NJ
David A. B. Miller - Lincroft NJ
Thomas H. Wood - Highlands NJ

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

H01L 3302
G02B 514

US Classification:

332 751

Abstract:

A semiconductor apparatus is provided. The apparatus has a multiple layer heterostructure having first and second material layers having first and second bandgaps, respectively and a semiconductor layer of a third bandgap being fabricated between said material layers, the bottom of the conduction band of said semiconductor layer is below the bottom of the conduction band of said material layers, and the top of the valence band of said semiconductor layer is above the top of the valence band of said material layers, the thickness of said semiconductor layer is chosen sufficient for carrier confinement effects within said semiconductor layer to influence the optical properties of said multiple layer heterostructure, and means for applying an electric field to the multiple layer heterostructure in order to vary an optical absorption coefficient and an index of refraction of the multiple layer heterostructure in response to the electric field. The apparatus is adapted for use as an optical absorption modulator or optical phase modulator, or as an electrically tuned Fabry-Perot cavity or as a polarization modulator, or as a nonlinear or bistable apparatus in which the operating point is varied by application of an electric field.

US Patent:

43785999, Mar 29, 1983

Filed:

Mar 3, 1981

Appl. No.:

6/240205

Inventors:

Theodoor C. Damen - Colts Neck NJ
Michel A. Duguay - Fair Haven NJ
Julian Stone - Rumson NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

H01S 318

US Classification:

372 43

Abstract:

Broadband laser gain is obtained in semiconductor materials by pumping an ultra-short laser cavity with picosecond excitation pulses. The broadband laser gain is used to provide picosecond laser radiation energy covering a wide spectrum of frequencies.

US Patent:

56893612, Nov 18, 1997

Filed:

Jan 22, 1996

Appl. No.:

8/589224

Inventors:

Theodoor Charlouis Damen - Colts Neck NJ
Martin C. Nuss - Fair Haven NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G02F 109

US Classification:

359284

Abstract:

An apparatus for, and method of, decreasing a temporal duration of an optical input pulse having an input power spectrum associated therewith, the apparatus and method operative on at least unchirped optical input pulses. The apparatus comprises: (1) a zero-dispersion pulse shaper for receiving the optical input pulse and spectrally spreading the input pulse to produce a spectrally-spread pulse and (2) a modulator array interposed within the zero-dispersion pulse shaper for receiving the spectrally-spread pulse and selectively attenuating a portion of the power spectrum of the spectrally-spread pulse by a predetermined amount to produce a selectively-attenuated spectrally-spread pulse, the zero-dispersion pulse shaper focusing and recombining the selectively-attenuated spectrally-spread pulse to produce an output pulse having a broader power spectrum than the input pulse, the output pulse further having a temporal duration less than the input pulse, regardless of whether the input pulse is chirped.

US Patent:

45502498, Oct 29, 1985

Filed:

Apr 21, 1983

Appl. No.:

6/487248

Inventors:

Theodoor C. Damen - Colts Neck NJ
Michael A. Duguay - Fair Haven NJ
Richard E. Howard - Holmdel NJ
Lawrence D. Jackel - Holmdel NJ
William J. Skocpol - East Windsor NJ

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

G01J 120

US Classification:

250201

Abstract:

A read/write system which reduces access time in optical disc apparatus is disclosed. The head includes an array of lenses which covers a substantial portion of the radius of the disc. Access of a particular disc track is achieved by deflection of the reading beam, rather than by any physical movement of the head. For read-out, the array focuses light reflected from the disc onto a corresponding array of photodetectors.