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:
May. 06, 2003
Filed:
Sep. 13, 1999
Michael Sauer, Dresden, DE;
Walter Nowak, Dresden, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
Useful signals in the baseband or else in an intermediate frequency band are impressed on a plurality of laser diodes or other suitable optical sources having different emission wavelengths, and the wavelength channels thus formed are brought together. An external modulator with a high cutoff frequency is inserted into this wavelength multiplex system and is driven at the desired microwave or millimetric wave subcarrier frequency or a subharmonic thereof, with the result that the modulation of all the wavelength channels is converted upward. The individual wavelength channels are decoupled in a wavelength-selective fashion to arbitrary photodiodes or other direct receivers that supply the selected useful signal modulated onto the subcarrier.