Samuel G Green

US Patent:

6862397, Mar 1, 2005

Filed:

Oct 15, 2002

Appl. No.:

10/270996

Inventors:

Daniel N. Harres - Belleville IL, US
Samuel I. Green - Saint Louis MO, US

Assignee:

The Boeing Company - Chicago IL

International Classification:

G02B006/00

US Classification:

385147, 385 12, 385 24, 385 53, 385 52, 385100, 25022711

Abstract:

A method for introducing errors into a digital fiber optic communication link so that small analog changes in optical transmission efficiency can be determined by changes in the audible error rate. The method comprises providing a transmitter with a test channel that provides a pseudorandom encoded optical transmission through coupled fiber optic cables. The signal is sent through the cables and received by a receiver which introduces and measures errors. The received signal is split and processed by a clock recovery circuit and a lowpass filter. The clock recovery circuit obtains the optimal sampling point. The lowpass filter filters the data and provides a timing adjustment relative to the recovered clock signal. The clock retimes the filtered data with a sampling comparator. The variable timing introduces errors allowing optical transmission efficiency measurements.

US Patent:

8463131, Jun 11, 2013

Filed:

Dec 15, 2010

Appl. No.:

12/968502

Inventors:

Samuel I. Green - Saint Louis MO, US

Assignee:

The Boeing Company - Chicago IL

International Classification:

H04B 10/00
H04B 10/04

US Classification:

398115, 398121, 398154, 398185

Abstract:

A method and apparatus for sending timing information using an optical signal. A first electrical signal comprising a pseudorandom binary sequence is generated. The first electrical signal comprising the pseudorandom binary sequence is modulated with a second electrical signal to form a modulated electrical signal. The second electrical signal includes timing data in a format used for global positioning systems. An optical carrier signal is modulated with the modulated electrical signal to form the optical signal using an optical transmitter.

US Patent:

50085263, Apr 16, 1991

Filed:

Oct 2, 1989

Appl. No.:

7/416003

Inventors:

Samuel I. Green - University City MO

Assignee:

McDonnell Douglas Corporation - St. Louis MO

International Classification:

H01J 4014

US Classification:

250214R

Abstract:

There is provided by this invention a photodetector and circuitry connected thereto wherein separate outputs are produced for low frequency and high frequency signals of the light impinging on the photodetector.