The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 29, 2003
Filed:
May. 09, 2001
Paul F. Wysocki, Flemington, NJ (US);
William S. Wong, San Jose, CA (US);
Onetta, Inc., Sunnyvale, CA (US);
Abstract
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.