Daniel Mahgerefteh1670 Malcolm Ave, Los Angeles, CA 90024

6335819, Jan 1, 2002

Feb 18, 2000

09/506745

Pak S. Cho - Gaithersburg MD
Julius Goldhar - Silver Spring MD
Daniel Mahgerefteh - Los Angeles CA

University of Maryland - Riverdale MD

H01S 300

359333, 359176

The present invention provides simultaneous all-optical regeneration (re-shape and re-amplify) and wavelength conversion using a reverse-biased electroabsorption modulator. The nonlinear optical transmission characteristic of the electroabsorption modulator reshapes the degraded input data by selective absorption of the optical noise and, therefore, increases the signal-to-noise ratio of the output. Reverse biasing the modulator allows fast recovery of the optical absorption for high data-rate operation without the detrimental bit-patterning effect. Error-free wavelength conversion and regeneration at 20 Gb/s was obtained with more than 3-dB improvement of the receiver sensitivity at a bit-error-rate of 10. Embodiments and applications of the present invention include an all-optical SEAM regenerator, an all-optical distributed feedback laser SEAM (DFB-SEAM) regenerator, an all-optical SEAM with fiber Bragg grating (SEAM-FBG) regenerator, an all-optical SEAM with polarizing beam splitter (SEAM-PBS) regenerator, an all-optical Mach-Zehnder interferometric (MZI-SEAM) regenerator, an all-optical 3-port MZI-SEAM regenerator, and a SEAM-based optimized receiver.

6940889, Sep 6, 2005

Feb 26, 2002

10/084788

Benjamin John Eggleton - Summit NJ, US
Daniel Mahgerefteh - Los Angeles CA, US
Paul Steinvurzel - Jersey City NJ, US
Paul Stephen Westbrook - Chatham NJ, US

Lucent Technologies Inc. - Murray Hill NJ

H01S003/08

372102, 372 20, 372 32, 372 43, 372 6

In accordance with the invention, a modulated RZ pulse source comprises a modulated light source optically coupled to a stabilized Bragg grating filter and one or more optical taps. The light source is preferably modulated in power and frequency and has an adjustable channel wavelength λ. The Bragg grating filter has a reflectivity bandwidth having a high slope reflectivity cutoff and is preferably tunable. A feedback arrangement responsive to the taps keeps the source channel wavelength λ on the edge of the reflectivity bandwidth for shaping RZ pulses. When the Bragg grating is stabilized, the feedback system maintains λ at a value linked to the grating reflectivity edge and, by overlapping at least part of the optical spectrum of the source, converts the modulated source light into RZ pulses with high extinction ratio (≧12 dB). The result is a high power, jitter-free RZ pulse source that is compact, inexpensive and power efficient.

6963685, Nov 8, 2005

Nov 6, 2002

10/289944

Daniel Mahgerefteh - Los Angeles CA, US
Parviz Tayebati - Weston MA, US

G02B006/34

385 37, 385 27, 398147

This invention generally relates to an optical filter for a fiber optic communication system. An optical filter may be used, following a directly modulated laser source, and converts a partially frequency modulated signal into a substantially amplitude modulated signal. The optical filter may compensate for the dispersion in the fiber optic transmission medium and may also lock the wavelength of the laser source.

7054538, May 30, 2006

Oct 6, 2003

10/680607

Daniel Mahgerefteh - Los Angeles CA, US
Duncan John William Walker - Somerville MA, US
Roeland Nuyts - Utrecht, NL

Azna LLC - Wilmington MA

G02B 6/00
G02B 6/26
G02B 6/42

385147, 385 15, 385 24, 385 27

This invention provides a flat dispersion frequency discriminator (FDFD) capable of having a substantially flat dispersion with either a positive or negative dispersion along the spectrum region of the discriminator. This way, a FDFD may not cause substantial distortion of the intensity patter of its output to minimize the occurrence distortion due to overshooting or undershooting of the intensity pattern depending on the relative spectral alignment of the laser output relative to the filter transmission.

7187821, Mar 6, 2007

Jan 18, 2005

11/037893

Yasuhiro Matsui - Lawrence MA, US
Daniel Mahgerefteh - Los Angeles CA, US

G02B 6/28
H04B 10/04
H04B 10/12

385 24, 398185, 398200

A method and system for suppression of the optical carrier of an optically modulated digital signal, the method comprising the steps of: modulating the amplitude of an optical carrier with digital input data to generate an amplitude modulated optical signal; and modulating the frequency of the optical carrier of the resulting optical signal with the same digital input data. A fiber optic system comprising: an optical source adapted to produce an adiabatically chirped amplitude modulated optical signal; an optical fiber adapted to receive the optical signal; and an optical receiver; wherein the optical power of the signal launched into the fiber exceeds the stimulated Brillouin threshold of the transmission fiber for a single frequency, continuous wave signal.

7352968, Apr 1, 2008

Dec 17, 2004

11/016020

Parviz Tayebati - Weston MA, US
Daniel Mahgerefteh - Los Angeles CA, US
Kevin McCallion - Charlestown MA, US

Finisar Corporation - Sunnyvale CA

H04B 10/04
H04J 14/02

398 87, 398185, 398186, 398187, 398201

There is provided a fiber optic system comprising:And there is provided a method for transmitting an optical signal through a fiber comprising:And there is provided a fiber optic system comprising:.

7356264, Apr 8, 2008

Dec 17, 2004

11/016466

Daniel Mahgerefteh - Los Angeles CA, US
Yasuhiro Matsui - Lawrence MA, US
Parviz Tayebati - Weston MA, US

Azna LLC - Wilmington MA

H04B 10/04

398193, 398201

A fiber optic transmitter comprising:A method for transmitting an optical signal through a fiber comprising:.

7376352, May 20, 2008

Dec 17, 2004

11/015686

Parviz Tayebati - Weston MA, US
Daniel Mahgerefteh - Los Angeles CA, US
Kevin McCallion - Charlestown MA, US

Finisar Corporation - Sunnyvale CA

H04B 10/16

398147, 398185, 398186, 398187, 398201, 398208

A fiber optic communication system comprising:.