Robert M Pafchek

6643441, Nov 4, 2003

Aug 29, 2000

09/651543

Robert M. Pafchek - Blandon PA
John Salama - Lawrenceville GA

Agere Sytems Inc. - Allentown PA

G02B 610

385129, 385130, 385141

The present invention provides an optoelectronic device with superior qualities. The optoelectronic device includes an optical core feature located over a substrate, an outer cladding layer located over the optical core feature and a direct patch mask formed on an outer cladding layer. In an exemplary embodiment of the invention, the direct patch mask has a light source passed therethrough that corrects birefringence in the optical core feature and the outer cladding layer.

6697544, Feb 24, 2004

Jul 25, 2001

09/911623

Robert M. Pafchek - Blandon PA
Christopher R. Doerr - Middletown NJ

Agere Systems, Inc. - Allentown PA
TriQuint Technology Holding Co. - Hillsboro OR

G02B 612

385 14, 24 27, 398149

A thermo-optic device and a method for using it are described. The device has a substrate including a pair of waveguides coupled at first and second coupling regions. At the first coupling region, an input signal is split between the two waveguides. Between the coupling regions on one of the waveguides is a demultiplexer, at least one phase shifting device, and a multiplexer. The signal portions recombine at the second coupling region. Heater strips at the first and second coupling regions alter the temperature at the first and second coupling regions, in response to applied control signals, thereby adjusting the insertion loss and dynamic range of the device. A sensor samples an output signal from the substrate and sends a signal to a controller, which controls the phase shifting devices and the heater strip to maintain the output signal within predetermined signal parameters.

7563628, Jul 21, 2009

Nov 3, 2005

11/265931

Thomas L. Koch - Califon NJ, US
Robert M. Pafchek - Blandon PA, US
Mark A. Webster - Bethlehem PA, US

Lehigh University - Bethlehem PA

H01L 21/00

438 31, 438 29, 438770, 438778, 257E21082, 257E21282

Disclosed is a method of fabricating an optical waveguide device including the steps of forming a mask over a waveguide core material layer so as to leave a portion of the layer exposed, and exposing the structure to an oxidizing environment to form an oxide layer on the waveguide core material layer at least in the exposed portion thereby defining the lateral dimension of the waveguide core. The resulting waveguide core has extremely smooth surfaces for low optical losses.

20020181822, Dec 5, 2002

May 10, 2001

09/852419

Christopher Doerr - Middletown NJ, US
John Gates - New Providence NJ, US
Dirk Muehlner - Muray Hill NJ, US
Robert Pafchek - Blandon PA, US

Agere Systems Inc.

G02F001/035

385/003000

An apparatus and method for reducing the power needed to operate a thermo-optic switch using a heat sensitive optical phase shifter which is controlled by an electrically powered metal heater strip attached to the optical waveguide of the phase shifter. The power can be reduced by reducing the thickness of the upper cladding to 15 microns or less, increasing the thickness of the lower cladding to more than 15 microns, and adjusting the index contrast () of the materials comprising the upper cladding, the lower cladding, and the core of the waveguide so that it is greater than 0.4%.

20030198450, Oct 23, 2003

May 15, 2003

10/439071

Robert Pafchek - Blandon PA, US
John Salama - Macungie PA, US

Lucent Technologies Inc. - Murray Hill NJ

G02B006/10

385/129000

The present invention provides an optoelectronic device with superior qualities. The optoelectronic device includes an optical core feature located over a substrate, an outer cladding layer located over the optical core feature and a direct patch mask formed on an outer cladding layer. In an exemplary embodiment of the invention, the direct patch mask has a light source passed therethrough that corrects birefringence in the optical core feature and the outer cladding layer.

52992101, Mar 29, 1994

Apr 28, 1992

7/876020

Elias Snitzer - Piscataway NJ
Robert Pafchek - Piscataway NJ

Rutgers University - New Brunswick NJ

H01S 314

372 6

A system for producing an optical gain, the system including a host having a light conducting path doped with thulium, holmium, and at least one rare earth selected from the group consisting of europium and terbium in respective amounts sufficient to produce an optical gain by energizing the thulium to a. sup. 3 H. sub. 4 state to produce an optical gain by a. sup. 3 H. sub. 4 -. sup. 3 F. sub. 4 transition, producing a 1. 47. mu. m wavelength output. There is subsequent energy transfer from the. sup. 3 F. sub. 4 state of the thulium to a. sup. 5 I. sub. 7 state of the holmium, and energy transfer from the. sup. 5 I. sub. 7 state to the rare earth selected from the group consisting of europium and terbium. The system can include oscillator, amplifier, and superluminescence source configurations. A method for making and a method for using the system are included.

56510837, Jul 22, 1997

Dec 18, 1995

8/573671

Ahmet Refik Kortan - Somerset NJ
Robert M. Pafchek - Lawrenceville GA

Lucent Technologies Inc. - Murray Hill NJ

G02B 616

385123

A method and apparatus are provided for forming a glass preform which can be directly drawn into a single or multi-mode optical fiber. Single or multi-mode fibers drawn from the preforms described herein have high quality core-clad interfaces since the core and cladding materials are not exposed to crystallization temperatures upon the addition of the core material to cladding material.

56560583, Aug 12, 1997

Dec 18, 1995

8/573670

Ahmet Refik Kortan - Somerset NJ
Robert M. Pafchek - Lawrenceville GA

Lucent Technologies Inc. - Murray Hill NJ

C03B 3702

65483

A method and apparatus are provided for forming a glass preform which can be directly drawn into a single or multi-mode optical fiber. Single or multi-mode fibers drawn from the preforms described herein have high quality core-clad interfaces since the core and cladding materials are not exposed to crystallization temperatures upon the addition of the core material to cladding material.