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:
Jan. 02, 2007
Filed:
Feb. 08, 2002
Ping Wai Wan, Ottawa, CA;
Derrick Remedios, Ottawa, CA;
Dongxing Jin, Ottawa, CA;
Patrick Chilufya Chimfwembe, Ottawa, CA;
Ping Wai Wan, Ottawa, CA;
Derrick Remedios, Ottawa, CA;
Dongxing Jin, Ottawa, CA;
Patrick Chilufya Chimfwembe, Ottawa, CA;
Tropic Networks Inc., Kanata, CA;
Abstract
Channels in an optical WDM network are each identified by at least two dither tones with which the channel is modulated, the dither tones alternating with a predetermined periodicity so that at any instant each channel is modulated by only one dither tone. The dither tones are continuously generated at precise frequencies. Channel detection by detecting the dither tones, for channels having optical powers over a wide dynamic range, makes use of an FFT process which can detect dither tones for high power channels in a single operation. Coherent averaging of FFT results over time is used to detect dither tones for low power channels over multiple FFT operations.