WILLIAM WONG, PHARMD
Pharmacy at Blossom Hill Rd, Los Gatos, CA

6556340, Apr 29, 2003

May 9, 2001

09/851379

Paul F. Wysocki - Flemington NJ
William S. Wong - San Jose CA

Onetta, Inc. - Sunnyvale CA

H01S 300

359334

Optical amplifiers and upgrade modules for the optical amplifier are provided. The optical amplifiers and upgrade modules may be used to amplify optical signals in fiber-optic communications networks. Optical gain may be produced by erbium-doped fiber amplifier stages and Raman amplifier arrangements. When an upgrade module is used to upgrade an amplifier, the light that is provided to the upgraded amplifier may be routed through optical components in the upgrade module. The upgrade module may be used to expand the optical bandwidth of the amplifier or to add Raman preamplification capabilities. When the upgrade module is used to add Raman gain, erbium-doped fiber that was used in the amplifier prior to upgrading may be removed from the optical path during the upgrade process to help maintain the desired spectral shape for the upgraded amplifier. Dynamic and passive filters may also be used to help maintain a desired spectral shape. Hot upgrades may be performed using the amplifiers and upgrade modules.

6441950, Aug 27, 2002

Dec 4, 2000

09/727776

Chien-Jen Chen - Cupertino CA
William S. Wong - San Jose CA
Jun Ye - Palo Alto CA

Onetta, Inc. - Sunnyvale CA

H04B 1012

359334, 3593414, 359177

Distributed Raman amplifier systems are provided in which gain transients are controlled. Signal taps may be used to monitor optical signal powers at network nodes. A telemetry channel may be used to share information between nodes. Information on the output power of a given node may be passed to a subsequent node using the telemetry channel. The subsequent node may use feed-forward and feedback control schemes to control Raman gain transients in the preceding transmission fiber span based on the output power information received over the telemetry channel.

6624927, Sep 23, 2003

Apr 18, 2001

09/836549

William S. Wong - San Jose CA
Chien-Jen Chen - Cupertino CA
G. Victor Treyz - San Carlos CA

Onetta, Inc. - Sunnyvale CA

H01S 300

359334

Raman amplifier equipment for fiber-optic communications links is provided. Raman pump light at a first wavelength or wavelengths may be used to optically pump fiber in a communications link to produce Raman gain. Raman pump light at a second wavelength or wavelengths may be used to optically pump the fiber to produce Raman gain for channels at different wavelengths in the communications link. The Raman gain produced by the pump light at the first wavelength or wavelengths increases the reach of the Raman pump light at the second wavelength or wavelengths into the fiber to improve the noise figure of the amplifier.

6417961, Jul 9, 2002

Dec 4, 2000

09/727775

Yan Sun - Menlo Park CA
Chien-Jen Chen - Cupertino CA
William S. Wong - San Jose CA

Onetta, Inc. - Sunnyvale CA

H01S 300

3593375, 359334

Optical amplifiers are provided that have dispersion-compensating fiber that is pumped with an optical source to produce Raman gain. Removable modules of dispersion-compensating fiber, which may be separate from the Raman-pumped dispersion-compensating fiber, may be used to adjust the amount of dispersion compensation provided by a given amplifier. The Raman pump may be formed using fiber-Bragg-grating-stabilized diode lasers or other suitable pump sources. Two cross-polarized diode lasers may be used for the Raman pump to reduce the dependence of the Raman gain on the polarization of the pump. If desired, the dispersion-compensating fiber may be Raman pumped using a two-pass configuration in which pump light reflects off of a reflector to produce additional gain. The reflector may be a Faraday rotator to minimize polarization-dependent pump effects.

6456426, Sep 24, 2002

Aug 7, 2001

09/922920

Maxim A. Bolshtyansky - Bound Book NJ
Chien-Jen Chen - Cupertino CA
William S. Wong - San Jose CA

Onetta, Inc. - Sunnyvale CA

H01S 310

359334, 359160, 359337, 35934131, 35934133, 372 70

Optical amplifiers are provided in which optical gain is produced by Raman pumping fiber. The Raman-pumped fiber may be a span of transmission fiber or a coil of fiber in a discrete amplifier. Raman pump light may be provided using laser diodes operating at different wavelengths. The Raman pump light that is produced by the laser diodes may be modulated to reduce pump interactions in the fiber. Raman pump light may be modulated by directly modulating the laser diodes or by using optical components that modulate constant power pump light from the laser diodes.

6396623, May 28, 2002

Jan 31, 2001

09/772847

Paul F. Wysocki - Flemington NJ
William S. Wong - San Jose CA

Onetta, Inc. - Sunnyvale CA

H01S 300

3593374, 359349

Amplifiers having multiple gain stages are provided. Some of the gain stages provide gain in a first wavelength band and some of the gain stages provide gain in a second wavelength band. The gain stages that provide gain in the first band are interleaved with the gain stages that provide gain in the second band. The gain stages may be based on rare-earth-doped fiber amplifiers, Raman-pumped fiber amplifiers, or other suitable optical amplifiers. Gain stages may be used that include parallel amplifier branches. Each of the parallel branches may handle a separate wavelength range.

6850360, Feb 1, 2005

May 4, 2001

09/848725

Chien-Jen Chen - Cupertino CA, US
William S. Wong - San Jose CA, US

Bookham, Inc. - San Jose CA

H04B 408, H01S 300

359334, 35934133, 398 21

Fiber-optic communications systems are provided for optical communications networks. Fiber-optic communications links may be provided that use spans of transmission fiber to carry optical data signals on wavelength-division-multiplexing channels at different wavelengths. Raman pump light may be used to provide Raman amplification for the optical data signals. The Raman pump light may be used to make measurements on the spans of transmission fiber. Raman pump light may be modulated to make optical time domain reflectometry measurements and measurements of the Raman gain coefficient in the fiber. Information on the measurements made using the Raman pump light may be used to control the Raman pump light during operation of the communications link and may be provided to a network management system.