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:
Dec. 23, 2014
Filed:
Oct. 11, 2012
Nec Laboratories America, Inc., Princeton, NJ (US);
Shaoliang Zhang, Plainsboro, NJ (US);
Lei Xu, Princeton Junction, NJ (US);
Junqiang Hu, Davis, CA (US);
Fatih Yaman, Monmouth Junction, NJ (US);
Ting Wang, West Windsor, NJ (US);
Yoshihisa Inada, Tokyo, JP;
Takaaki Ogata, Tokyo, JP;
Yasuhiro Aoki, Tokyo, JP;
NEC Laboratories America, Inc., Princeton, NJ (US);
Abstract
A method implemented in a transmission apparatus used in an optical fiber communications system for a polarization switched differential quaternary phase-shift keying (DQPSK) signal is disclosed. The method comprises splitting data into two or more data streams, inputting said two or more data streams to 1-bit DQPSK precoders to perform 1-bit DQPSK precoding, and multiplexing inphase outputs of the 1-bit DQPSK precoders to generate a first output; and multiplexing quadrature outputs of the 1-bit DQPSK precoders to generate a second output. Other methods, apparatuses, and systems also are disclosed.