Betty A Anderson

US Patent:

6388815, May 14, 2002

Filed:

Aug 24, 2000

Appl. No.:

09/645136

Inventors:

Stuart Collins, Jr. - Worthington OH
Betty Lise Anderson - Gahanna OH

Assignee:

The Ohio State University - Columbus OH

International Classification:

G02B 2714

US Classification:

359633, 359631, 359237, 359291, 359290

Abstract:

The present invention includes time delay devices and time delay systems. The invention also includes machines and instruments using those aspects of the invention. The invention may also be used to upgrade, repair, or retrofit existing machines or instruments, using methods and components known in the art. The present invention comprises a true time device that falls into the free-space category but uses a multiple-pass optical cell with refocusing mirrors that has the advantage of avoiding beam-spreading problems. This approach differs from previous free-space approaches in that it uses only one optical switch or spatial light modulator instead of one or more switches for each bit. In one approach, a microwave signal for each antenna element may be modulated onto an optical beam. After the individual optical beams are delayed by the desired amount of time through the system, the signals may then be down-converted to microwave signals for further processing. This process may be used in either the transmit or the receive mode of a phased array radar.

US Patent:

6525889, Feb 25, 2003

Filed:

Oct 16, 2000

Appl. No.:

09/688478

Inventors:

Betty Lise Anderson - Gahanna OH

Assignee:

The Ohio State University - Columbus OH

International Classification:

G02B 504

US Classification:

359836, 359831, 359237, 359298, 359290, 359291

Abstract:

The present invention includes time delay devices and time delay systems. The invention also includes machines and instruments using those aspects of the invention. The invention may also be used to upgrade, repair, or retrofit existing machines or instruments, using methods and components known in the art. The present invention comprises a true time device that falls into the free-space category but uses a multiple-pass optical cell with refocusing mirrors that has the advantage of avoiding beam-spreading problems. This approach differs from previous free-space approaches in that it uses only one optical switch or spatial light modulator instead of one or more switches for each bit. In one approach, a microwave signal for each antenna element may be modulated onto an optical beam. After the individual optical beams are delayed by the desired amount of time through the system, the signals may then be down-converted to microwave signals for further processing. This process may be used in either the transmit or the receive mode of a phased array radar.

US Patent:

6674939, Jan 6, 2004

Filed:

Mar 26, 2002

Appl. No.:

10/106177

Inventors:

Betty Lise Anderson - Gahanna OH

Assignee:

The Ohio State University - Columbus OH

International Classification:

G02B 626

US Classification:

385 27, 385 28, 385 31, 385 33, 385 35, 385147, 398 52, 398 53, 398 88

Abstract:

The present invention provides for a delay unit for optically generating time delays in signals comprising: a delay entrance plane, the delay entrance plane comprising at least one row of signal input positions, wherein each signal input position is adapted to receive an optical beam from a source; a delay exit plane, the delay exit plane comprising a respective number of rows of signal output positions, each signal output position is adapted to output the optical beam; and wherein each signal input position of a given row is connected by an optical fiber to a corresponding signal output position, each optical fiber of a given row being the same length as every other optical fiber of that row. Also provided are apparatus and methods for generating time delays in signals.

US Patent:

6724951, Apr 20, 2004

Filed:

Mar 26, 2002

Appl. No.:

10/106776

Inventors:

Betty Lise Anderson - Gahanna OH

Assignee:

The Ohio State University - Columbus OH

International Classification:

G02B 626

US Classification:

385 15, 385 27, 385 31, 385119

Abstract:

The present invention comprises a shifting unit that uses optical fibers to shift beams among various outputs. The shifting unit comprises a shifting entrance plane and a shifting exit plane. The shifting entrance plane comprises at least one row of signal input positions. Each signal input position is adapted to receive an optical signal from a source. The shifting exit plane comprises a respective number of rows of signal output positions. Each signal output position is adapted to output an optical beam. Each signal input position of a given row is connected by an optical fiber to a corresponding signal output position. Also, each optical fiber is the same length as every other optical fiber in the shifting unit. The present invention also comprises methods and apparatus comprising the shifting unit.

US Patent:

6760140, Jul 6, 2004

Filed:

Mar 1, 2002

Appl. No.:

10/086355

Inventors:

Victor Argueta-Diaz - Columbus OH
Betty Lise Anderson - Columbus OH

Assignee:

The Ohio State University Research Foundation - Columbus OH

International Classification:

G02F 103

US Classification:

359245, 359251, 359255

Abstract:

An optical interconnection device and a spot displacement device are presented. In optical interconnection device of the present invention, a spot displacement device is employed to cause a light beam to shift positions, thereby making available output positions not previously available for a light beam having bounced so few times.

US Patent:

6766073, Jul 20, 2004

Filed:

May 17, 2002

Appl. No.:

10/150791

Inventors:

Betty Lise Anderson - Gahanna OH

Assignee:

The Ohio State University - Columbus OH

International Classification:

G02B 642

US Classification:

385 18, 385 31, 385 33, 385 36, 359850, 359858

Abstract:

An optical circulator of the present invention comprises (a) an array of ports, the array comprising at least a first port and a last port, each port is adapted to (i) inject a beam of light into said optical circulator, and (ii) remove a beam of light from said optical circulator; (b) a first reflective member adapted to receive a beam of light from a port and to reflect the beam of light to a second reflective member; (c) a second reflective member adapted to receive a beam of light from the first reflective member and to reflect the beam of light to a third reflective member; and (d) a third reflective member adapted to receive a beam of light from the second reflective member and to sequentially direct the beam to a next port of the array so as to circulate the beam of light through at least a portion of the array of ports.

US Patent:

6952306, Oct 4, 2005

Filed:

Dec 2, 2003

Appl. No.:

10/726770

Inventors:

Betty Lise Anderson - Gahanna OH, US

Assignee:

The Ohio State University - Columbus OH

International Classification:

G02B026/08

US Classification:

359298, 359291, 359237, 359246, 359247

Abstract:

A temporal optical correlator is disclosed. The example optical correlator includes a light source, a set of White cells and a micro-mirror array. The micro-mirror array and set of White cells cooperate to produce a correlated summed output signal. A method for processing signals using the example optical correlator is also disclosed.

US Patent:

7236238, Jun 26, 2007

Filed:

Dec 2, 2003

Appl. No.:

10/726771

Inventors:

Arjan Durresi - Columbus OH, US
Betty Lise Anderson - Gahanna OH, US

Assignee:

The Ohio State University - Columbus OH

International Classification:

G01N 21/00

US Classification:

356 731

Abstract:

A method and apparatus for monitoring the quality of an optical link is disclosed. According to a first aspect of the present invention, a method for determining a quality of an optical link is disclosed. The method includes identifying a known signal and transmitting and receiving the signal over an optical link. The method also includes comparing the received signal to the known signal using optical correlation. The method further includes determining a quality of the optical link based on the comparison.