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:
Mar. 19, 2024
Filed:
Mar. 29, 2018
Mitsubishi Electric Corporation, Tokyo, JP;
Shumpei Kameyama, Tokyo, JP;
Eisuke Haraguchi, Tokyo, JP;
Yutaka Kajiyama, Tokyo, JP;
Nobuki Kotake, Tokyo, JP;
Takayuki Yanagisawa, Tokyo, JP;
Toshiyuki Ando, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
An optical transmission unit () transmits an optical signal having a light intensity set as a Low level component of a pulse. An optical partial reflector () is provided on a path through which transmission light is transmitted from a circulator () to the atmosphere, and reflects the optical signal. A detection unit () performs coherent detection on reception light using, as local light, a signal in a Low level section in the optical signal reflected by the optical partial reflector ().