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. 11, 2012
Filed:
Jun. 30, 2009
Shuqiang Shen, Shenzhen, CN;
Shuqiang Shen, Shenzhen, CN;
Huawei Technologies Co., Ltd., Shenzhen, CN;
Abstract
A light mark, a method and a device for light mark modulation and demodulation are disclosed. The modulation method includes: generating a mark with periodically alternating frequency and interval; and modulating the mark signal onto an optical signal. In the present disclosure, the mark with periodically alternating frequency and interval is adapted to distinguish different wavelengths by using different frequencies, and distinguish the same wavelength from different nodes by using the same frequency but different intervals. Therefore, numerous available marks are obtained with a small number of frequencies, and unique marks for all wavelengths in a network only require a number of frequencies equal to the number of the wavelengths in the network. Moreover, even if a wavelength conflict occurs, the wavelength conflict can be determined according to detected marks.