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:
Jul. 18, 2017
Filed:
Jul. 02, 2015
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Inwoong Kim, Allen, TX (US);
Olga Vassilieva, Plano, TX (US);
Motoyoshi Sekiya, Richardson, TX (US);
Fujitsu Limited, Kawasaki, JP;
Abstract
Methods and systems for superchannel subcarrier monitoring using amplitude modulated (AM) tones include modulating an optical subcarrier of a superchannel with a first frequency that is chosen to be substantially smaller than a baud rate for data modulated onto the optical subcarrier. Certain pairs of subcarriers in the superchannel may be modulated with AM tones having a common frequency with complementary phase for power equalization. Then, downstream detection and monitoring of the optical subcarrier may be performed based on demodulation of the first frequency. Each optical subcarrier in the superchannel may be modulated using a respectively unique combination of AM tone and phase.