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:
Jan. 15, 2013
Filed:
Feb. 20, 2009
Akihide Sano, Yokosuka, JP;
Eiichi Yamada, Yokosuka, JP;
Takayuki Kobayashi, Yokosuka, JP;
Koichi Ishihara, Yokosuka, JP;
Yutaka Miyamoto, Yokosuka, JP;
Riichi Kudo, Yokosuka, JP;
Akihide Sano, Yokosuka, JP;
Eiichi Yamada, Yokosuka, JP;
Takayuki Kobayashi, Yokosuka, JP;
Koichi Ishihara, Yokosuka, JP;
Yutaka Miyamoto, Yokosuka, JP;
Riichi Kudo, Yokosuka, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
A high-performance optical OFDM receiver is realized. A subcarrier separation circuit receives an optical OFDM signal consisting of two subcarriers A and B and separates a subcarrier component, signal light and first local oscillator light are input to the subcarrier separation circuit, the subcarrier separation circuit converts the signal light and the first local oscillator into a baseband electrical signal, the subcarrier separation circuit converts the baseband electrical signal into a digital signal, the subcarrier separation circuit shifts the frequency of the converted digital signal so that a center frequency of the subcarrier A becomes zero, and the subcarrier separation circuit adds a frequency shifted signal to a signal obtained by delaying the frequency shifted signal by ½ of a symbol time to separate a component of the subcarrier A.