Frank M Little

US Patent:

52670716, Nov 30, 1993

Filed:

Sep 3, 1991

Appl. No.:

7/754029

Inventors:

Frank R. Little - Alpharetta GA
John G. Megna - Lilburn GA
Heather H. Rand - Alpharetta GA
Frederick T. Zendt - Norcross GA

Assignee:

Scientific-Atlanta, Inc. - Norcross GA

International Classification:

H04B 1000

US Classification:

359154

Abstract:

A system for signal level control in AM fiber systems is provided. The system provides level controls at both transmitter and receiver ends of the fiber transmission system, utilizing compensation and control techniques at each end to maintain and optimize the performance of the system. The transmitter includes two stage level control based on a composite power level of a detected RF signal. The receiver includes two stage level control based on a pilot channel filtered from the channels transmitted to the receiver.

US Patent:

53473884, Sep 13, 1994

Filed:

Sep 3, 1991

Appl. No.:

7/753951

Inventors:

Frank R. Little - Alpharetta GA
Herman A. Kruse - Winder GA
John G. Megna - Lilburn GA
Rezin E. Pidgeon - Atlanta GA

Assignee:

Scientific-Atlanta, Inc. - Atlanta GA

International Classification:

H04B 1006

US Classification:

359189

Abstract:

A receiver is described for optical signals which are amplitude modulated with broadband radio frequency signals. The receiver includes an optical detector which receives the incoming optical signal and generates a radio frequency electrical signal which varies with the power level of the incoming optical signal. This electrical signal is applied to a pair of amplifiers which are connected in a push-pull relationship. A gain control circuit controls the gain of the amplifier pair.

US Patent:

55007589, Mar 19, 1996

Filed:

Oct 11, 1994

Appl. No.:

8/321234

Inventors:

Leo Thompson - Lilburn GA
Frank Little - Alpharetta GA
Rezin E. Pidgeon - Atlanta GA

Assignee:

Scientific-Atlanta, Inc. - Norcross GA

International Classification:

H04B 1006

US Classification:

359189

Abstract:

An optical communications system including a plurality of modulated radio frequency carriers which span more than an octave in bandwidth. In one implementation, the carriers are grouped into ranges which span less than an octave in bandwidth and the individual groups are transmitted over unique optical links. In another implementation, the groups are multiplexed on one optical link by using different wavelengths. In still another implementation, several of the bands are up-converted to the highest band of interest and then transmitted, either over single or multiple links. The resulting optical signals are demodulated and then down-converted before they are recombined into the broadband signal in excess of an octave in bandwidth.

US Patent:

47486678, May 31, 1988

Filed:

Nov 4, 1986

Appl. No.:

6/926749

Inventors:

James O. Farmer - Lilburn GA
Anatoly Kozushin - Duluth GA
Herman A. Kruse - Winder GA
William P. LaFay - Snellville GA
Christopher P. Lewis - Snellville GA
Frank R. Little - Alpharetta GA
Leo Montreuil - Atlanta GA
Leo J. Thompson - Lilburn GA
Lamar E. West - Maysville GA
Joseph G. Mobley - Dunwoody GA

Assignee:

Scientific Atlanta - Atlanta GA

International Classification:

H04N 7167
H03H 700

US Classification:

380 7

Abstract:

Scrambling and descrambling systems utilizing jamming signals provide improved pictures with minimal distortion due to ghosts and artifacts. The television signal is combined with a jamming signal or signals located preferably in the vestigial sideband (VSB) of the modulated picture carrier and at about a null in the spectrum of the modulation of the picture carrier by the horizontal sync. The jamming signal or signals also preferably are placed between the harmonic components of the horizontal sync which define the horizontal sync spectrum and at frequencies which comply with governmental regulations respecting frequency locations of strong signals of CATV purposes. The jamming signals are generated by phase locking to the horizontal sync signals of the television signals or to a submultiple of the horizontal sync frequency. Artifacts are further reduced by preemphasis of the transmitted television signal in the sideband opposite to that in which the jamming signal or signals are located and spaced by an equal frequency increment from the location of the jamming signal energy. In order to extract the jamming signal, so as to descramble the television signal for reproduction in the subscriber's television receiver, a network including at least one surface acoustic wave (SAW) resonator device is embedded in an all-pass network which allows essentially lossless transmission of the television signal spectrum, except for the jamming signal energy and enables that energy to be located close to (e. g.

US Patent:

53791410, Jan 3, 1995

Filed:

Dec 30, 1992

Appl. No.:

7/998208

Inventors:

Leo Thompson - Lilburn GA
Frank Little - Alpharetta GA
Rezin E. Pidgeon - Atlanta GA

Assignee:

Scientific-Atlanta, Inc. - Norcorss GA

International Classification:

H04J 1402

US Classification:

359125

Abstract:

An optical communications system including a plurality of modulated radio frequency carriers which span more than an octave in bandwidth. In one implementation, the carriers are grouped into ranges which span less than an octave in bandwidth and the individual groups are transmitted over unique optical links. In another implementation, the groups are multiplexed on one optical link by using different wavelengths. In still another implementation, several of the bands are up-converted to the highest band of interest and then transmitted, either over single or multiple links. The resulting optical signals are demodulated and then down-converted before they are recombined into the broadband signal in excess of an octave in bandwidth.

US Patent:

54773709, Dec 19, 1995

Filed:

Aug 22, 1994

Appl. No.:

8/293311

Inventors:

Frank R. Little - Alpharetta GA
Herman A. Kruse - Winder GA
John G. Megna - Lilburn GA
Rezin E. Pidgeon - Atlanta GA

Assignee:

Scientific-Atlanta, Inc. - Norcross GA

International Classification:

H04B 1006

US Classification:

359189

Abstract:

A receiver is described for optical signals which are amplitude modulated with broadband radio frequency signals. The receiver includes an optical detector which receives the incoming optical signal and generates a radio frequency electrical signal which varies with the power level of the incoming optical signal. This electrical signal is applied to a pair of amplifiers which are connected in a push-pull relationship. A gain control circuit controls the gain of the amplifier pair.

US Patent:

51914590, Mar 2, 1993

Filed:

Dec 4, 1989

Appl. No.:

7/446461

Inventors:

Leo Thompson - Lilburn GA
Frank Little - Alpharetta GA
Rezin E. Pidgeon - Atlanta GA

Assignee:

Scientific-Atlanta, Inc. - Atlanta GA

International Classification:

H04J 1402

US Classification:

359133

Abstract:

An optical communications system including a plurality of modulated radio frequency carriers which span more than an octave in bandwidth. In one implementation, the carriers are grouped into ranges which span less than octave in bandwidth and separately transmitted over uique optical links. In another implementation, the groups are multiplexed on one optical link by using different wavelengths. In still another implementation, several of the bands are up-converted to the highest band of interest and then transmitted, either over single or multiple links. The resulting signals are demodulated and then down-converted before they are recombined into the broadband signal in excess of an octave in bandwidth.

US Patent:

59633522, Oct 5, 1999

Filed:

Feb 21, 1997

Appl. No.:

8/804424

Inventors:

Dogan A. Atlas - Duluth GA
Rezin E. Pidgeon - Atlanta GA
Frank R. Little - Alpharetta GA

Assignee:

Scientific-Atlanta, Inc. - Norcross GA

International Classification:

H04B 1004

US Classification:

359161

Abstract:

A distortion circuit for linearizing third-, fifth- and seventh-order distortion components in a non-linear optical communications system includes at least one group of series connected diodes coupled to a common input terminal for receiving a signal source at one end and to an inductor and a capacitor at the other end, a resistance coupled to the common input terminal and a bias source for providing a bias current to the group of series connected diodes. The distortion circuit may be implemented as a predistortion circuit in the headend of the optical communications system or as a postdistortion circuit at the receiving end.