Mahir A Nayfeh

6424754, Jul 23, 2002

Sep 29, 2000

09/671743

David T. Carrott - Bristow VA
Mahir A. Nayfeh - Catonsville MD

Tasc, Inc. - Reading MA

G02F 101

385 2, 385 4, 385 1, 385 8, 359245, 359254

First and second AC electric sources modulate a coherent wave constant amplitude optical beam. An optical waveguide arrangement responsive to the optical wave, includes first and second pairs of electrodes respectively connected to be responsive to the first and second AC sources. The electrode pairs are capacitively coupled to first and second portions of the optical waveguide arrangement for amplitude modulating the optical wave propagating in the first and second portions in accordance with the first and second AC sources, respectively. The first and second portions of the optical waveguide arrangement are coupled together so that the waves modulated in the first and second portions are combined to derive a third coherent modulated optical wave.

6967768, Nov 22, 2005

May 13, 2002

10/144082

Charles W. Haggans - Clarksville MD, US
Jun Bao - Ellicott City MD, US
Harshad Sardesai - Ellicott City MD, US
Michael Y. Frankel - Baltimore MD, US
Mahir Nayfeh - Catonsville MD, US
Balakrishnan Sridhar - Ellicott City MD, US

Ciena Corporation - Linthicum MD

H01S003/00

35933711

An optical communication device, and related method, are provided for reducing ripple in WDM systems. In particular, the optical communication device includes a dynamic gain equalization (DGE) circuit is coupled to an optical communication path carrying the WDM optical signals. The DGE circuit adjusts the powers associated with each channel on a channel-by-channel basis so that the WDM optical signal has a desired power spectrum. The DGE is controlled in response to sense signals generated by an optical performance monitoring (OPM) circuit located downstream from the DGE or substantially co-located with the DGE. The OPM monitors the WDM spectrum for optical signal power variations and outputs the sense signal when the variations fall outside a given tolerance. Typically, one DGE is associated with a group of concatenated amplifiers so that multiple DGEs are provided in a system having many groups of such amplifiers. Likewise, multiple OPMs are provided in such systems, each corresponding to a respective DGE, so that ripple can be reduced and desired WDM optical signal powers can be achieved in the WDM system.

7075711, Jul 11, 2006

Nov 15, 2004

10/986817

Charles W. Haggans - Clarksville MD, US
Jun Bao - Ellicott City MD, US
Harshad Sardesai - Ellicott City MD, US
Michael Y. Frankel - Baltimore MD, US
Mahir Nayfeh - Catonsville MD, US
Balakrishnan Sridhar - Ellicott City MD, US
Vipul Bhatnagar - Kensington MD, US

Ciena Corporation - Linthicum MD

H04B 10/12
H04J 14/00

3593412, 398 67

An optical communication device, and related method, are provided for reducing ripple in WDM systems. In particular, the optical communication device includes a dynamic gain equalization (DGE) circuit is coupled to an optical communication path carrying the WDM optical signals. The DGE circuit adjusts the powers associated with each channel on a channel-by-channel basis so that the WDM optical signal has a desired power spectrum. The DGE is controlled in response to sense signals generated by an optical performance monitoring (OPM) circuit located downstream from the DGE or substantially co-located with the DGE. The OPM monitors the WDM spectrum for optical signal power variations and outputs the sense signal when the variations fall outside a given tolerance. Typically, one DGE is associated with a group of concatenated amplifiers so that multiple DGEs are provided in a system having many groups of such amplifiers. Likewise, multiple OPMs are provided in such systems, each corresponding to a respective DGE, so that ripple can be reduced and desired WDM optical signal powers can be achieved in the WDM system.

7092148, Aug 15, 2006

May 13, 2002

10/144082

Charles W. Haggans - Clarksville MD, US
Jun Bao - Ellicott City MD, US
Harshad Sardesai - Ellicott City MD, US
Michael Y. Frankel - Baltimore MD, US
Mahir Nayfeh - Catonsville MD, US
Balakrishnan Sridhar - Ellicott City MD, US
Vipul Bhatnagar - Kensington MD, US

Ciena Corporation - Linthicum MD

H01S 3/00

35933711

An optical communication device, and related method, are provided for reducing ripple in WDM systems. In particular, the optical communication device includes a dynamic gain equalization (DGE) circuit is coupled to an optical communication path carrying the WDM optical signals. The DGE circuit adjusts the powers associated with each channel on a channel-by-channel basis so that the WDM optical signal has a desired power spectrum. The DGE is controlled in response to sense signals generated by an optical performance monitoring (OPM) circuit located downstream from the DGE or substantially co-located with the DGE. The OPM monitors the WDM spectrum for optical signal power variations and outputs the sense signal when the variations fall outside a given tolerance. Typically, one DGE is associated with a group of concatenated amplifiers so that multiple DGEs are provided in a system having many groups of such amplifiers. Likewise, multiple OPMs are provided in such systems, each corresponding to a respective DGE, so that ripple can be reduced and desired WDM optical signal powers can be achieved in the WDM system.

7343101, Mar 11, 2008

Sep 27, 2002

10/256561

Michael Y. Frankel - Baltimore MD, US
Mahir Nayfeh - Catonsville MD, US

Ciena Corporation - Linthicum MD

H04B 10/00

398158, 398161

A method of reducing correlation between channels in an optical communication network. A transmission characteristic of first data on a first channel is altered to reduce correlation between the first data and second data on a second channel. The reduction in correlation reduces crosstalk. The transmission characteristic may be one or more of time delay, scrambling, inversion or modulation.

62854933, Sep 4, 2001

Jul 31, 2000

9/629157

David T. Carrott - Bristow VA
Mahir A. Nayfeh - Catonsville MD

Tasc, Inc. - Reading MA

G02F 133

359311

An optically defractive medium of a Bragg cell has a moving grating induced therein in response to acoustic waves propagating in the medium. First and second electro-acoustic transducers coupled to the medium launch first and second acoustic waves toward each other in response to electric excitation of the transducers to produce a moving grating having an amplitude proportional to the difference in the amplitude of the first and second acoustic waves. A laser illuminates the medium and an optical detector array including plural individual detector elements responds to optical energy from the source, as modulated by the moving grating. A processor responds to the detector elements to derive an indication of time difference of arrival of first and second electric signals that respectively drive the first and second transducers. Anomalies of a system including the cell are detected by simultaneously driving the first and second transducers with the same electric signal and detecting the amplitude of light incident on a detector which should have a zero light amplitude incident on it under these circumstances.

61476463, Nov 14, 2000

Aug 30, 1999

9/385887

Steven H. Arneson - Mesa AZ
Mahir A. Nayfeh - Catonsville MD

Motorola, Inc. - Schaumburg IL

G01S 502

342417

A sensor performs input pulse deinterleaving based on an angle of arrival (AOA) of each sensed pulse. An AOA determination unit determines an AOA for each received pulse. The pulses are then sorted based on AOA into a number of AOA bins. The data within each bin is then analyzed to determine whether it corresponds to an emitter of interest. Bin data corresponding to emitters of interest are then transmitted to a remote processing facility for additional processing.