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:
Nov. 29, 2011
Filed:
Jul. 10, 2008
Christopher R. Cole, Redwood City, CA (US);
Daniel Mahgerefteh, Palo Alto, CA (US);
The'linh Nguyen, San Jose, CA (US);
Andrew C. Singer, Champaign, IL (US);
Naresh Ramnath Shanbhag, Champaign, IL (US);
Christopher R. Cole, Redwood City, CA (US);
Daniel Mahgerefteh, Palo Alto, CA (US);
The'Linh Nguyen, San Jose, CA (US);
Andrew C. Singer, Champaign, IL (US);
Naresh Ramnath Shanbhag, Champaign, IL (US);
Finisar Corporation, Sunnyvale, CA (US);
Abstract
A high-speed optical transmitter comprises multiple digital lanes that are provided to a bank of digital-to-analog converters. The analog signals are then used to Phase Shift Keyed (PSK) modulation using a Chirp Managed Laser (CML)-based transmitter, and potentially using dual polarization. A corresponding optical receiver receives the sequence of optical signals at a demodulator. For each polarization, the demodulator includes a corresponding demodulation channel that is configured to demodulate that polarization component of the optical signal into one or more signal components. Each of these signal components is converted into a corresponding digital signal using a corresponding analog-to-digital converter. In the case of higher-order PSK modulation (e.g., 8PSK or higher), for each polarization, the analog converter has a lower sampling rate than for QPSK modulation.