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:
Nov. 26, 2002
Filed:
Feb. 19, 1999
Armin Splett, München, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
On an acousto-optical add/drop multiplexer to whose input the wavelength-division multiplex signal is applied, a plurality of surface acoustic waves are excited at specific frequencies and in each case a portion of the light power is separated from wavelength-division multiplex channels at an optical frequency which is governed by the frequency of such a surface acoustic wave; a superheterodyne receiver (HE), to whose input side the separated light power elements with one polarization are applied as well as light power elements with another polarization which are output from the non-separated elements of the wavelength-division multiplex signal emits an output signal which corresponds to the light power levels which are transmitted in a channel-specific manner in the individual wavelength-division multiplex channels, with whose aid a regulating device in each case separately readjusts the light power transmitted in the individual wavelength-division multiplex channels to a predetermined value.