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. 27, 2001
Filed:
Jan. 17, 2001
Francesco Cisternino, Turin, IT;
Andrea De Marchi, Turin, IT;
Raffaele Girardi, Mondovi, IT;
Stefania Roemisch, Borgaretto, IT;
Agilent Technologies, Inc., Palo Alto, CA (US);
Abstract
The circuit includes an electro-optical mixer, such as an electro-optical Mach-Zehnder modulator, with non-linear behavior. The modulator receives as input an optical signal (P,) at the frequency to be divided, in addition to an electric signal (e,) at a given frequency, usually corresponding to the frequency deriving from such division. The output optical signal (P,) from modulator exhibits a modulation spectrum containing the frequency difference between the frequency to be divided and at least one harmonic of the frequency of the above electric signal. After having been converted into an electric signal (e,), the output signal of the mixer is subjected to a filtering action to extract the above frequency difference component. This latter one is then used both as electrical signal (e,) for the mixing, and as output signal from the divider (e,). The preferred application is to OTDM systems, to extract a synchronism signal as tributary signal frequency.