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. 10, 2009
Filed:
Nov. 29, 2005
P. Vijay Kumar, Rolling Hills Estates, CA (US);
Reza Omrani, Los Angeles, CA (US);
Joseph D. Touch, Manhattan Beach, CA (US);
Alan E. Willner, Los Angeles, CA (US);
Poorya Saghari, Los Angeles, CA (US);
P. Vijay Kumar, Rolling Hills Estates, CA (US);
Reza Omrani, Los Angeles, CA (US);
Joseph D. Touch, Manhattan Beach, CA (US);
Alan E. Willner, Los Angeles, CA (US);
Poorya Saghari, Los Angeles, CA (US);
University of Southern California, Los Angeles, CA (US);
Abstract
An optical code division multiple access (OCDMA) system includes an optical transmitter system configured to transmit data from a plurality of users through a shared optical channel by encoding the data from each user with a spreading code assigned to that user. Each spreading code includes a unique sequence of T time chips along a time axis. The data from each user is representable by T symbols. The OCDMA system further includes an optical receiver system configured to demodulate the data from each user by correlating signals received from the transmitter system with the spreading code assigned to that user. When transmitting a data symbol for each user, the transmitter system selects one out of T distinct cyclic shifts of the spreading code assigned to that user, and transmits the selected cyclic shift of the assigned spreading code along the time axis.