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. 02, 2013
Filed:
Apr. 24, 2008
Nicola Calabretta, Pisa, IT;
Marco Presi, Pisa, IT;
Giampiero Contestabile, Pisa, IT;
Pierpaolo Ghiggino, Spa, IT;
Ernesto Ciaramella, Rome, IT;
Fabio Cavaliere, Filettole, IT;
Roberto Proietti, Davis, CA (US);
Nicola Calabretta, Pisa, IT;
Marco Presi, Pisa, IT;
Giampiero Contestabile, Pisa, IT;
Pierpaolo Ghiggino, Spa, IT;
Ernesto Ciaramella, Rome, IT;
Fabio Cavaliere, Filettole, IT;
Roberto Proietti, Davis, CA (US);
Telefonaktiebolaget L M Ericsson (publ), Stockholm, SE;
Abstract
An optical PON network comprises a central office which generates N DPSK modulated optical signals, where N is an integer greater than 1, an optical coupling which connects the N signals to at least one optical fiber, a passive distribution node located remotely from the central office which has at least one input port that is coupled to the fiber and a plurality of output ports, the node being arranged to transmit a first wavelength of the N signals to at least one of its output ports, and at least one optical network unit connected through a respective optical fiber to the first output port of the passive distribution node. The passive distribution node comprises an arrayed waveguide grating which provides a passive optical connection between its input port and the first output port and which for that connection functions as a bandpass filter having a profile and bandwidth selected such that the DPSK optical signal passed to the input node is converted to an intensity modulated signal at the output port.