Benjamin J Greene

US Patent:

6568219, May 27, 2003

Filed:

Jul 31, 2000

Appl. No.:

09/629757

Inventors:

Alastair Malcolm Glass - Rumson NJ
Benjamin Irvin Greene - Westfield NJ
Nonna Kopylov - Scotch Plains NJ
Ahmet Refik Kortan - Warren NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

C03B 37027

US Classification:

65386, 65391, 65 331, 385130, 385 2, 385141, 501 10, 501 41, 501135, 501137, 501 37

Abstract:

The specification describes ceram-glass compositions useful for electro-optic devices. The compositions have active ferroelectric ingredients in a tellurium oxide host. Proper processing of the ceram-glass produces highly transparent material with desirable ferroelectric properties. The ceram-glass materials can be used for electro-optic devices in both bulk and thin film applications.

US Patent:

56257236, Apr 29, 1997

Filed:

Feb 28, 1995

Appl. No.:

8/396031

Inventors:

Corrado Dragone - Little Silver NJ
Benjamin I. Greene - Westfield NJ
Thomas A. Strasser - Chatham NJ
Cynthia A. Volkert - Murray Hill NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G02B 612

US Classification:

385 11

Abstract:

A method for reducing the inherent polarization shift caused by birefringence between the TE and TM modes of an optical signal propagating in an optical grating which has a plurality of waveguides includes the step of: irradiating the waveguides of the optical grating for different periods of time to induce a compensating polarization shift that substantially reduces the inherent polarization shift. If desired, a compensating polarization shift may be induced which not only reduces but also substantially eliminates the inherent polarization shift.

US Patent:

59388110, Aug 17, 1999

Filed:

May 23, 1997

Appl. No.:

8/862557

Inventors:

Benjamin Irvin Greene - Westfield NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

C03B 3200

US Classification:

65385

Abstract:

In accordance with the invention glass waveguide devices are provided with enhanced temperature stability by incorporating within appropriate lengths of the waveguides a transparent compensating material having a refractive index variation with temperature that differs substantially from that of the waveguide. The compensating material can be a non-glass material, such as a liquid, driven into the glass by heat and pressure. In a preferred embodiment, D. sub. 2 O is incorporated into waveguides for optical communications. The D. sub. 2 O is transparent to the preferred communications wavelengths centered at about 1. 55. mu. m and has a dn/dT opposite in polarity to the dn/dT of glass. The resulting structure exhibits enhanced temperature stability with reduced magnitude of dn/dT. The technique is particularly useful in devices based on interference between multiple waveguides, as it is not necessary to reduce dn/dT to zero in the respective waveguides.

US Patent:

44008147, Aug 23, 1983

Filed:

May 1, 1981

Appl. No.:

6/259548

Inventors:

Richard L. Fork - Middletown NJ
Benjamin I. Greene - Matawan NJ
Charles V. Shank - Holmdel NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

H01S 3083

US Classification:

372 94

Abstract:

A ring cavity laser is disclosed wherein a Rhodamine 6G dye stream is used as the gain medium, and a saturable absorber stream is positioned in the ring cavity at a point such that the time difference between pulses arriving at the gain stream is not small compared to the recovery time of the gain medium. The saturable absorber is DODCI dissolved in ethylene glycol passed through a specially constructed nozzle that creates a dye stream having a thickness of about 10 microns in the optical cavity. As a result of this thin saturable absorber, the two counterpropagating pulses that collide in the saturable absorber are caused to interact in a way that results in a decrease of the pulse duration and an equalization of the pulse intensities.

US Patent:

47877146, Nov 29, 1988

Filed:

Jun 17, 1986

Appl. No.:

6/875268

Inventors:

Benjamin I. Greene - Westfield NJ
Rebecca R. Millard - New Providence NJ
Joseph Orenstein - Red Bank NJ
Leah R. Williams - Cambridge MA

Assignee:

American Telephone and Telegraph Company, AT&T Bell Laboratories - Murray Hill NJ

International Classification:

G02B 523
G02B 610
G02F 101
H01S 310

US Classification:

350354

Abstract:

An optical system is disclosed which includes at least a first source of electromagnetic radiation (signal beam radiation), a device for processing the signal beam radiation, and a detector for detecting the processed signal beam radiation. The processing device functions, for example, as an amplitude modulator, a demultiplexer, or a switch, and includes a material region exhibiting a nonlinear optical response at one or more resonant wavelengths of electromagnetic radiation, as well as at least a second source of electromagnetic radiation (control beam radiation) for selectively inducing the nonlinear optical response. Significantly, the wavelength, duration and intensity of the control beam radiation are chosen to induce a resonant, nonlinear optical response, essentially free of any relatively slow component, in said material region at repetition rates higher than about 1. 25. times. 10. sup. 4 Hz, or higher than about 3. 3. times. 10. sup. 10 Hz, or even as high, or higher, than about 2. 5. times. 10. sup. 11 Hz.

US Patent:

55880851, Dec 24, 1996

Filed:

Apr 17, 1996

Appl. No.:

8/633323

Inventors:

Benjamin I. Greene - Westfield NJ
Chellappan Narayanan - North Plainfield NJ
Herman M. Presby - Highland Park NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G02B 602
C03B 37023

US Classification:

385123

Abstract:

A method of making a silicate optical waveguide structure for transforming an optical beam of a first modal spot size to a beam of a second modal spot size includes the step of selecting an irradiation energy which is at least partially absorbed by the cladding of the structure. A variable dosage of radiation is then provided along the length of the structure. The radiation has an energy equal to the selected irradiation energy so that a refractive index change of the cladding is greater than a refractive index change of the core.

US Patent:

55069258, Apr 9, 1996

Filed:

Feb 28, 1995

Appl. No.:

8/396023

Inventors:

Benjamin I. Greene - Westfield NJ
Thomas A. Strasser - Chatham NJ
Cynthia A. Volkert - Murray Hill NJ

Assignee:

AT&T Corp. - Murray Hill NJ

International Classification:

G02B 610
C03B 37023

US Classification:

385129

Abstract:

A method for reducing birefringence in a silicate waveguide structure having a waveguide core and cladding includes the step of selecting an irradiation energy that induces compaction in the cladding. The waveguide structure is then irradiated with radiation having an energy equal to the irradiation energy to induce a reduction in birefringence.

US Patent:

48712353, Oct 3, 1989

Filed:

Jun 9, 1988

Appl. No.:

7/207004

Inventors:

Benjamin I. Greene - Westfield NJ
Kuochou Tai - North Plainfield NJ
Mrinal Thakur - Summit NJ

Assignee:

American Telephone and Telegraph Company, AT&T Bell Laboratories - Murray Hill NJ

International Classification:

G02B 523
G02B 610
G02F 101
H01S 310

US Classification:

350354

Abstract:

An optical system is disclosed which includes at least a first source of electromagnetic radiation (signal beam radiation), a device for processing the signal beam radiation, and a detector for detecting the processed signal beam radiation. The processing device functions, for example, as an amplitude modulator, a demultiplexer, or a switch, and includes a material region exhibiting a nonlinear optical response at one or more resonant wavelengths of electromagnetic radiation, as well as at least a second source of electromagnetic radiation (control beam radiation) for selectively inducing the nonlinear optical response. Significantly, the wavelength, duration and intensity of the control beam radiation are chosen to induce a resonant, nonlinear optical response, essentially free of any relatively slow component, in said material region at repetition rates higher than about 1. 25. times. 10. sup. 4 Hz, or higher than about 3. 3. times. 10. sup. 10 Hz, or even as high, or higher, than about 2. 5. times. 10. sup. 11 Hz.