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:
May. 10, 2016
Filed:
Mar. 14, 2014
Nec Corporation, Minato-ku, Tokyo, JP;
Kumi Ito, Tokyo, JP;
Kouichi Suzuki, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
Abstract
An object of the invention is to provide an optical transmission apparatus capable of reducing the influence of nonlinear effect of an optical fiber, suppressing a band requested to a device from being widened, easily bias controlling a modulator, and flexibly switching plural modulation methods. An optical transmission apparatusaccording to the invention includes a modulatorand a controller. The modulatoris a modulator capable of quadrapture phase-shift keying the light from a light source and outputting the light. The controllercontrols the input signal to the modulatorand causes the modulatorto carry out a quadrapture phase-shift keying operation or a π/2 shift binary phase-shift keying operation.