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:
Jul. 30, 2013
Filed:
Dec. 21, 2005
Loïc Becouarn, Paris, FR;
Georges Grandpierre, Arpajon, FR;
Thierry Boissau, Voisins le Bretonneux, FR;
Loïc Becouarn, Paris, FR;
Georges Grandpierre, Arpajon, FR;
Thierry Boissau, Voisins le Bretonneux, FR;
Alcatel Lucent, Paris, FR;
Abstract
A demodulator for a DPSK-modulated optical signal of bit frequency 1/T, comprises an interferometric structure () having an input port () for receiving the DPSK-modulated optical signal, an output port (), and first and second arms () extending from said input port () to said output port (), adjustment means () for fine tuning a propagation delay difference of said two arms () in a range comprising T, an optical/electrical converter () connected to the output port () of the interferometric structure (), and a bandpass filter () connected to an output of the optical/electrical converter (), the passband of which does not include 1/T. The adjustment means () is adapted to tune the propagation delay according to the output power level of the bandpass filter ().