Arthur F Judy

US Patent:

6535660, Mar 18, 2003

Filed:

Aug 9, 2000

Appl. No.:

09/634966

Inventors:

Arthur F Judy - Atlanta GA

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G02B 642

US Classification:

385 15, 385 24, 372 6

Abstract:

A Raman-amplified optical transmission system includes a source of optical transmission signals having a system wavelength, , that are connected to one end of the of a first optical fiber - having a large effective area, i. e. , A 70 m. The other end of the first optical fiber is connected to a second optical fiber - having a small effective area, i. e. , A 60 m. Preferably, the first and second optical fibers have opposite dispersion signs. A wavelength-division multiplexer for example, couples optical transmission signals. . . , from an optical pump to the second optical fiber that cause it to exhibit stimulated Raman scattering, which provides amplification of the optical transmission signals. Preferably, the optical pump signals propagate along the second optical fiber in a direction that is opposite the direction of the optical transmission signals. Exemplary cables are disclosed that include both large and small-effective-area fibers.

US Patent:

6792214, Sep 14, 2004

Filed:

Sep 28, 2000

Appl. No.:

09/671924

Inventors:

Arthur F. Judy - Atlanta GA
Torben N. Nielsen - Monmouth Beach NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04B 1012

US Classification:

398147, 398148, 398 81, 385123

Abstract:

An optical transmission system designed for gigabit pulse rates and Raman pumping in which there is essentially no pre-dispersion compensation and the in-line dispersion compensation at the start of each span is overcompensation of between 110 and 120 of the compensation needed to neutralize the dispersion of its immediately preceding span.

US Patent:

59058382, May 18, 1999

Filed:

Feb 18, 1998

Appl. No.:

9/025195

Inventors:

Arthur F. Judy - Atlanta GA
David Kalish - Roswell GA
Raymond Bradfield Kummer - Lilburn GA
David Wayne Peckham - Norcross GA
William Alfred Reed - Summit NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G02B6/02

US Classification:

385123

Abstract:

Simultaneous dense WDM operation in both the 1310 nm and 1550 nm transparency windows of silica-based optical fiber, is enabled by a fiber design providing for nulled dispersion within a critically positioned wavelength range. Design provides for values of dispersion in both windows sufficiently low for desired per-channel bit rate, and, at the same time, sufficiently high to maintain effects of non-linear dispersion within tolerable limits for WDM operation. Fiber fabrication and system design are described.

US Patent:

56110162, Mar 11, 1997

Filed:

Jun 7, 1996

Appl. No.:

8/660639

Inventors:

Robert E. Fangmann - Lilburn GA
Arthur F. Judy - Atlanta GA
James J. Refi - Atlanta GA

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G02B 644

US Classification:

385100

Abstract:

A dispersion-balanced optical cable 90 reduces four-photon mixing in Wave Division Multiplexing (WDM) systems and is effective to reduce cumulative dispersion D substantially to zero. The dispersion-balanced optical cable 90 includes one or more optical fibers 90-1 having positive dispersion D. sub. 1, and one or more optical fibers 90-2 having negative dispersion D. sub. 2. The fibers are singlemode and are suitable for the transmission of optical signals in the 1550 nm region. At this wavelength, the positive-dispersion fibers have a chromatic dispersion of about +2. 3 ps/nm. km, and the negative-dispersion fibers have a chromatic dispersion of about -1. 6 ps/nm. km. The dispersion-balance optical cable preferably includes an equal number of positive- and negative-dispersion fibers in the same cable. Various cable configurations 60, 80, 90 can be used including: a ribbon 60 which comprises a planar array of optical fibers bound together by a matrix material 65; groups of positive- and negative-dispersion fibers enclosed within a plastic tube 81; or other known configurations. An improved WDM system 100 interconnects two dispersion-balanced cables 90-90, and a crossover connection 105 is made between the positive-dispersion fibers 90-1 of one cable 90 and the negative-dispersion fibers 90-2 of the other cable 90.