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:
Feb. 02, 2016
Filed:
Jan. 20, 2012
Masao Morie, Tokyo, JP;
Kouichi Suzuki, Tokyo, JP;
Masao Morie, Tokyo, JP;
Kouichi Suzuki, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
Abstract
In a coherent optical receiver device, the control process for keeping received signals in high quality is complicated, therefore, a coherent optical receiver device according to an exemplary aspect of the invention includes a coherent optical receiver receiving input signal light; an input power monitor obtaining input power information determined on the basis of the power of the input signal light; a local oscillator connected to the coherent optical receiver; and a controller connected to the coherent optical receiver, the input power monitor, and the local oscillator; wherein the coherent optical receiver comprises a 90-degree hybrid circuit, a photoelectric converter, and an amplifier; the input power monitor is disposed in the optical path of the input signal light in a stage preceding the amplifier; and the controller obtains the input power information from the input power monitor and controls the power of local oscillation light output from the local oscillator on the basis of the input power information.