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:
Jun. 03, 2014
Filed:
Mar. 20, 2009
Hisao Nakashima, Kawasaki, JP;
Takeshi Hoshida, Kawasaki, JP;
Takahito Tanimura, Kawasaki, JP;
Lei LI, Beijing, CN;
Ling Liu, Beijing, CN;
Hisao Nakashima, Kawasaki, JP;
Takeshi Hoshida, Kawasaki, JP;
Takahito Tanimura, Kawasaki, JP;
Lei Li, Beijing, CN;
Ling Liu, Beijing, CN;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical receiving apparatus includes a combining unit that combines signal light and reference light; a optoelectric converting unit that converts, into electrical signals, two or more optical signals that enable reconstruction of a complex electric field signal of the signal light obtained by the combining unit; and a sampling clock generating unit that generates a sampling clock that has a frequency preset based on a symbol rate of the signal light and is asynchronous with the signal light. The optical receiving apparatus further includes a digital converting unit that samples at the frequency of the sampling clock signal, an electrical signal obtained by the optoelectric converting unit and converts the electrical signal into a digital signal; and a digital signal processing unit that demodulates a received signal based on a complex digital signal obtained from the digital signal obtained by the digital converting unit.