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. 07, 2013
Filed:
Feb. 23, 2011
Hongbin Zhang, Marlboro, NJ (US);
Carl R. Davidson, Warren, NJ (US);
Jin-xing Cai, Morganville, NJ (US);
Yi Cai, Jackson, NJ (US);
Hongbin Zhang, Marlboro, NJ (US);
Carl R. Davidson, Warren, NJ (US);
Jin-Xing Cai, Morganville, NJ (US);
Yi Cai, Jackson, NJ (US);
Tyco Electronics Subsea Communications LLC, Eatontown, NJ (US);
Abstract
In general, optical communication systems and methods may implement a vestigial phase shift keying (PSK) modulation format to enable relatively high transmission rates with closer channel spacing and improved signal detection in a WDM optical communication system. A PSK modulated signal may be correlated with a phase shift, for example, using a delay line interferometer (DLI), to generate a vestigial PSK signal, which may be pre-filtered, combined, and transmitted in the WDM system. The correlation with a phase shift compresses and shifts the signal spectrum such that intersymbol interference (ISI) length may be reduced with minimal increase in the bit error rate (BER) when the vestigial PSK signal is detected.