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. 25, 2008
Filed:
Aug. 02, 2004
James Finn Aldridge, Palo Alto, CA (US);
Frank Levinson, Palo Alto, CA (US);
Johnny Zhong, Hayward, CA (US);
Steve Wang, San Jose, CA (US);
James Finn Aldridge, Palo Alto, CA (US);
Frank Levinson, Palo Alto, CA (US);
Johnny Zhong, Hayward, CA (US);
Steve Wang, San Jose, CA (US);
Finisar Corporation, Sunnyvale, CA (US);
Abstract
Systems and methods use single-fiber optical add/drop multiplexers (OADMs) to enable bi-directional data transmission in WDM systems over a single fiber. By reducing the required capacity for an optical network from dual fibers to a single fiber, significant cost and bandwidth efficiencies are achieved. The systems and methods also provide redundancy protection in single-fiber bidirectional line ring systems. In the event of a downstream fiber or device failure, the OADM module receives a signal on a first wavelength from a first direction, shifts the signal from the first wavelength to a second wavelength, and sends the signal back down the fiber it originated from on the second wavelength, thus maintaining the propagation of the signal in the ring system.