Michael S Rowan

US Patent:

6452945, Sep 17, 2002

Filed:

Jan 13, 1999

Appl. No.:

09/229594

Inventors:

David B. Upham - Sunnyvale CA
Augustus Elmer - San Jose CA
Laurence J. Newell - Saratoga CA
David A. Pechner - San Jose CA
Abraham Kou - San Jose CA
Michael W. Rowan - Los Gatos CA
James F. Coward - La Honda CA
Norman L. Swenson - Fremont CA
Minnie Ho - Palo Alto CA

Assignee:

Kestrel Solutions, Inc. - Mountain View CA

International Classification:

H04J 308

US Classification:

370480, 370535

Abstract:

A frequency division multiplexing (FDM) node used in optical communications networks provides add-drop multiplexing (ADM) functionality between optical high-speed channels, and low-speed tributaries. The FDM node includes a high-speed system and an ADM crosspoint. The high-speed system converts between an optical high-speed channel and its constituent electrical, low-speed channels through the use of frequency division multiplexing. The ADM crosspoint couples any incoming low-speed channels and any incoming tributaries to any outgoing low-speed channels and tributaries, thus implementing the ADM functionality for the FDM node.

US Patent:

7146103, Dec 5, 2006

Filed:

Jul 30, 2001

Appl. No.:

09/918886

Inventors:

Ting K Yee - Foster City CA, US
Peter H Chang - San Jose CA, US
Shin-Sheng Tarng - San Jose CA, US
Gregory M Cutler - Cupertino CA, US
Slava Yazhgur - Daly City CA, US
Ji Li - Cupertino CA, US
Laurence J Newell - Saratoga CA, US
James F Coward - Los Gatos CA, US
Michael W Rowan - Los Gatos CA, US
Norman L Swenson - Fremont CA, US
Matthew C Bashaw - Palo Alto CA, US

Assignee:

Forster Energy LLC - Las Vegas NV

International Classification:

H04J 14/02
H04J 1/00
H04J 1/04
H04J 1/08
H04B 10/04
H04B 10/05
H04B 10/08
H04B 10/145
H04B 10/148

US Classification:

398 68, 398 76, 398 82, 398 91, 398 95, 398152, 398163, 398184, 398196, 398205

Abstract:

A transmitter subsystem generates an optical signal which contains multiple subbands of information. The subbands have different polarization. For example, in one approach, two or more optical transmitters generate optical signals which have different polarization. An optical combiner optically combines the optical signals into a composite optical signal for transmission across an optical fiber. In another aspect, each optical transmitter generates an optical signal containing both a lower optical sideband and an upper optical sideband (i. e. , a double sideband optical signal). An optical filter selects the upper optical sideband of one optical signal and the lower optical sideband of another optical signal to produce a composite optical signal.

US Patent:

7447436, Nov 4, 2008

Filed:

Aug 31, 2006

Appl. No.:

11/514381

Inventors:

Ting K. Yee - Foster City CA, US
Peter H. Chang - San Jose CA, US
Chin-Sheng Tarng - San Jose CA, US
Gregory M. Cutler - Cupertino CA, US
Slava Yazhgur - Daly City CA, US
Ji Li - Cupertino CA, US
Laurence J. Newell - Saratoga CA, US
James F. Coward - Los Gatos CA, US
Michael W. Rowan - Los Gatos CA, US
Norman L. Swenson - Fremont CA, US
Matthew C. Bradshaw - Palo Alto CA, US

Assignee:

Forster Energy LLC - Las Vegas NV

International Classification:

H04B 10/08
H04B 10/04
H04B 10/06
H04B 10/145
H04B 10/148
H04J 14/02
H04J 1/00
H04J 1/04
H04J 1/08

US Classification:

398 95, 398 68, 398 82, 398 91, 398152, 398163, 398184, 398196, 398205

Abstract:

A transmitter subsystem generates an optical signal which contains multiple subbands of information. The subbands have different polarizations. For example, in one approach, two or more optical transmitters generate optical signals which have different polarizations. An optical combiner optically combines the optical signals into a composite optical signal for transmission across an optical fiber. In another aspect, each optical transmitter generates an optical signal containing both a lower optical sideband and an upper optical sideband (i. e. , a double sideband optical signal). An optical filter selects the upper optical sideband of one optical signal and the lower optical sideband of another optical signal to produce a composite optical signal.