Carl F Davidson

US Patent:

6342961, Jan 29, 2002

Filed:

Aug 4, 2000

Appl. No.:

09/632415

Inventors:

Neal S. Bergano - Lincroft NJ
Carl Davidson - Manalapan NJ

Assignee:

TyCom (US) Inc. - Morristown NJ

International Classification:

H04J 1402

US Classification:

359124, 359122, 359156, 359133

Abstract:

A gain-clamped, optical amplifier includes a rare-earth doped fiber and a source of pump energy coupled to the rare-earth doped fiber. The doped fiber serves as a gain medium that is optically pumped by the pump source. A wavelength-selective optical feedback loop is coupled between input and output ports of the rare-earth doped fiber. The feedback loop supports a compensating laser signal, which is a pulsed signal located at a wavelength different from a signal wavelength.

US Patent:

7256877, Aug 14, 2007

Filed:

Jan 26, 2006

Appl. No.:

11/340880

Inventors:

Robert R. Cordell - Holmdel NJ, US
Carl R. Davidson - Warren NJ, US
Yi Cai - Eatontown NJ, US
Hongbin Zhang - Eatontown NJ, US

Assignee:

Tyco Telecommunications (US) Inc. - Morristown NJ

International Classification:

G01N 21/00

US Classification:

356 731

Abstract:

A system and method for optimizing dispersion in an optical transmission line is provided. The system and method comprise measuring the amplitude of a d. c. voltage component of a synchronously demodulated data signal of at least one wavelength channel by an in-phase carrier at the baud frequency of the wavelength channel. In an alternative embodiment, the system and method comprise measuring the IF amplitude of the resulting a. c. signal of a data signal of the at least one wavelength channel comprising a received RZ signal mixed with a local oscillator, whose frequency differs from the wavelength channel baud by a relatively small amount, somewhere on the order of about 100 kHz.

US Patent:

7295728, Nov 13, 2007

Filed:

Feb 27, 2006

Appl. No.:

11/363511

Inventors:

Jin-Xing Cai - Morganville NJ, US
Dmitri Foursa - Freehold NJ, US
Carl R. Davidson - Warren NJ, US
Alexei N. Pilipetskii - Colts Neck NJ, US
Morten Nissov - Ocean NJ, US
Neal S. Bergano - Lincroft NJ, US

Assignee:

Tyco Telecommunications (US) Inc. - Morristown NJ

International Classification:

G02B 6/28

US Classification:

385 24, 385 15, 398 58

Abstract:

A WDM optical transmission system and method uses slope compensation at the transmit terminal and/or the receive terminal. The system and method may be used with modulation formats with a short pulse width and a broad optical spectrum.

US Patent:

7373040, May 13, 2008

Filed:

Apr 13, 2007

Appl. No.:

11/734987

Inventors:

Jin-Xing Cai - Morganville NJ, US
Dmitri Foursa - Freehold NJ, US
Carl R. Davidson - Warren NJ, US
Alexei N. Pilipetskii - Colts Neck NJ, US
Morten Nissov - Ocean NJ, US
Neal S. Bergano - Lincroft NJ, US

Assignee:

Tyco Telecommunications (US) Inc. - Morristown NJ

International Classification:

G02B 6/28

US Classification:

385 24, 385 15, 398 58

Abstract:

A WDM optical transmission system and method uses slope compensation at the transmit terminal and/or the receive terminal. The system and method may be used with modulation formats with a short pulse width and a broad optical spectrum.

US Patent:

7778550, Aug 17, 2010

Filed:

Jul 27, 2007

Appl. No.:

11/829458

Inventors:

Hongbin Zhang - Marlboro NJ, US
Ralph Brian Jander - Freehold NJ, US
Carl R Davidson - Warren NJ, US

Assignee:

Tyco Electronics Subsea Communications LLC - Morristown NJ

International Classification:

H04J 14/02

US Classification:

398 95, 398 93, 398196, 398197

Abstract:

A system and method using for wavelength monitoring and control in a WDM optical communication system. An aggregate channel monitor detects crosstalk between channels in the aggregate signal. Channel spacing may be modified by an element management system in response to the output of the aggregate channel monitor.

US Patent:

8090270, Jan 3, 2012

Filed:

Aug 6, 2008

Appl. No.:

12/187084

Inventors:

Hongbin Zhang - Marlboro NJ, US
Carl R. Davidson - Warren NJ, US

Assignee:

Tyco Electronics Subsea Communications LLC - Morristown NJ

International Classification:

H04B 10/06
H04B 10/12
H04B 10/04

US Classification:

398188, 398201, 398212

Abstract:

An apparatus, system and method wherein a polarization multiplexed differential phase shift keying format (POLMUX-DPSK) is provided with offset and bit-interleaved frequency channels and demodulated using a DPSK demodulator.

US Patent:

8437644, May 7, 2013

Filed:

Feb 23, 2011

Appl. No.:

13/033084

Inventors:

Hongbin Zhang - Marlboro NJ, US
Carl R. Davidson - Warren NJ, US
Jin-Xing Cai - Morganville NJ, US
Yi Cai - Jackson NJ, US

Assignee:

Tyco Electronics Subsea Communications LLC - Eatontown NJ

International Classification:

H04B 10/04

US Classification:

398188

Abstract:

In general, optical communication systems and methods may implement a vestigial phase shift keying (PSK) modulation format to enable relatively high transmission rates with closer channel spacing and improved signal detection in a WDM optical communication system. A PSK modulated signal may be correlated with a phase shift, for example, using a delay line interferometer (DLI), to generate a vestigial PSK signal, which may be pre-filtered, combined, and transmitted in the WDM system. The correlation with a phase shift compresses and shifts the signal spectrum such that intersymbol interference (ISI) length may be reduced with minimal increase in the bit error rate (BER) when the vestigial PSK signal is detected.

US Patent:

8483574, Jul 9, 2013

Filed:

Oct 15, 2010

Appl. No.:

12/905717

Inventors:

Hongbin Zhang - Marlboro NJ, US
Yu Sun - Lausdale PA, US
Carl Davidson - Warren NJ, US
Yi Cai - Jackson NJ, US

Assignee:

Tyco Electronics Subsea Communications, LLC - Eatontown NJ

International Classification:

H04B 10/00
H04B 10/04
H04B 10/06

US Classification:

398158, 398184, 398192, 398201, 398207

Abstract:

An optical transmitter utilizing a multi-level data modulator to produce a PDM-QPSK signal, a one-bit delay interferometer configured to correlate the multi-level data modulated signal and an optical filter configured to combine the correlated multi-level data modulated signal with one or more neighboring signals prior to transmitting over one of a plurality of optical channels. The PDM-QPSK correlated signal is configured to reduce the signal spectrum thereby increasing spectral efficiency of the transmitted signal.