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:
Sep. 14, 2010
Filed:
Jan. 29, 2008
Jean Armstrong, North Balwyn, AU;
Jean Armstrong, North Balwyn, AU;
Ofidium Pty Ltd., Melbourne, AU;
Abstract
Methods and apparatus () for composing, generating and transmitting information-bearing optical signals are provided. An information-bearing electrical signal is composed () having desirable spectral properties, preferably configured to ensure that undesired interference between electrical spectral components generated in a square-law direct detection process () at a corresponding optical receiver () is substantially avoided. Predistortion () is advantageously applied to transmitted signals, in order to account for a nonlinear relationship arising in a modulation process () between electrical signal amplitude and corresponding optical field amplitude. Orthogonal frequency division multiplexing (OFDM) techniques may be applied to composed signals having the desired characteristics, and additionally may facilitate the application of frequency domain equalisation () in order to mitigate transmission impairments, including dispersion. Improvements in received signal quality, and/or transmission distance, may thereby be achieved, along with simplification of receiver configuration and operation.