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. 02, 2015
Filed:
Nov. 29, 2010
Applicant:
Shinya Sasaki, Sapporo, JP;
Inventor:
Shinya Sasaki, Sapporo, JP;
Assignee:
HITACHI, LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B 10/25 (2013.01); H04B 10/556 (2013.01); H04B 10/67 (2013.01); H04L 27/20 (2006.01); H04L 27/22 (2006.01); H04L 27/26 (2006.01);
U.S. Cl.
CPC ...
H04B 10/25 (2013.01); H04B 10/5563 (2013.01); H04B 10/675 (2013.01); H04L 27/2096 (2013.01); H04L 27/223 (2013.01); H04L 27/2697 (2013.01);
Abstract
A technique for reducing a necessary bandwidth of an optical receiver in an optical OFDM communication system is disclosed. Optical OFDM signals of different spectra are alternately transmitted for each OFDM symbol time, and; after this light is transmitted via an optical fiber, the light undergoes photoelectric conversion by a delay interferometer having a delay time equal to one symbol time and a balanced direct detection receiver and is received.