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:
Aug. 02, 2011
Filed:
Jan. 15, 2008
Daniel Mahgerefteh, Palo Alto, CA (US);
Xueyan Zheng, Andover, MA (US);
Yasuhiro Matsui, Woburn, MA (US);
Parviz Tayebati, Boston, MA (US);
Andrew C Singer, Champaign, IL (US);
Daniel Mahgerefteh, Palo Alto, CA (US);
Xueyan Zheng, Andover, MA (US);
Yasuhiro Matsui, Woburn, MA (US);
Parviz Tayebati, Boston, MA (US);
Andrew C Singer, Champaign, IL (US);
Finisar Corporation, Sunnyvale, CA (US);
Abstract
A method for generating D-N-PSK optical signals is disclosed wherein a laser is modulated to generate optical signal pairs including phase modulated and fixed phase portions, the phase modulated portions having a frequency encoding one or more data symbols and the fixed phase portion having a carrier frequency and a phase corresponding to the immediately preceding phase modulated portion. The output of the laser is passed through an optical spectrum reshaper having a transmission function chosen to attenuate a plurality of the phase modulated portions relative to the fixed phase portions. The phase modulated portions may have N frequency levels located on either side of the carrier frequency. One of the N frequency levels may be equal to the carrier frequency.