David Yoo

US Patent:

7653318, Jan 26, 2010

Filed:

Apr 12, 2006

Appl. No.:

11/402511

Inventors:

Yifei Li - Norwood PA, US
Samuel Goldwasser - Bala-Cynwyd PA, US
Robert Fischl - Moorsetown NJ, US
William D. Jemison - Easton PA, US
David K. Yoo - Collingswood NJ, US

Assignee:

F&H Applied Science Associates, Inc. - Mt. Laurel NJ

International Classification:

H04B 10/148

US Classification:

398209, 398204

Abstract:

Disclosed is a Photonic Phase Locked Loop (PPLL) detector/discriminator, which makes possible a system for optically transmitting electromagnetic signals through a transmission medium (such as optical fiber, optical waveguide, underwater, in biological tissue, or in free space) with high sensitivity and extremely high dynamic range exceeding what is possible with present optical intensity modulated (AM) systems. Information is encoded on an optical carrier through the use of phase modulation (PM) or frequency modulation (FM). This information is subsequently demodulated into an accessible form through the use of the PPLL.

US Patent:

7835650, Nov 16, 2010

Filed:

Jul 11, 2007

Appl. No.:

11/776322

Inventors:

Yifei Li - Norwood PA, US
Peter Herczfeld - Bala Cynwyd PA, US
David K. Yoo - Vallejo CA, US

Assignee:

Drexel University - Philadelphia PA

International Classification:

G02F 1/01

US Classification:

398212, 398202, 398203, 398204

Abstract:

A linear phase demodulator/down-converter comprises an optical amplitude modulator for modulating the amplitude of an optical input signal, a photo-detector, a loop filter and an optical phase modulator provided with a light source. The optical phase modulator/down-converter provides optical down conversion, optical up conversion, or a combination thereof. The photo-detector can be a balanced photo-detector. Linear phase demodulation and/or down conversion is performed completely in the optical domain.

US Patent:

20070036631, Feb 15, 2007

Filed:

Aug 15, 2005

Appl. No.:

11/203776

Inventors:

David Yoo - Haworth NJ, US

International Classification:

F16B 21/00

US Classification:

411351000

Abstract:

Disclosed herein is a draw key assembly for securing a kingpin. In some embodiments of the invention, the draw key assembly includes a front portion, a rear portion, a rear end nut, and a front end nut. In a first preferred embodiment, the front portion includes a cylindrical body having a front end, a hex head attached to the front end, and a threaded member extending from the cylindrical body. In the first preferred embodiment, the rear portion includes a flared section with a threaded bore formed therein for mating with the threaded member. In the first preferred embodiment, the rear portion also includes a threaded fastener extending from the flared section. The rear end nut mates with the threaded fastener and the front end nut mates with threads formed about the front end of the cylindrical body. Additional embodiments of the invention are disclosed herein.