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:
Jun. 28, 2016
Filed:
Oct. 16, 2014
Oracle International Corporation, Redwood City, CA (US);
Eric Y. Chang, San Mateo, CA (US);
Elad Alon, El Cerrito, CA (US);
Frankie Y. Liu, Palo Alto, CA (US);
ORACLE INTERNATIONAL CORPORATION, Redwood Shores, CA (US);
Abstract
An optical receiver includes a feedback circuit that applies a feedback signal to a front-end circuit prior to the front-end circuit converting an optical signal into an analog electrical signal. In particular, the optical receiver includes a digital slicer that determines a digital electrical signal from the analog electrical signal based on a reference voltage that specifies a decision threshold and a clock that specifies sampling times. The feedback circuit determines the feedback signal at least one previous bit preceding a current bit in the analog electrical signal that is provided by the digital slicer and an impulse response of a communication channel. Moreover, the feedback signal has a pulse width that is less than a bit time of the clock. In this way, the optical receiver can cancel post-cursors of the current bit, even when the communication channel includes a low-pass filter.