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:
May. 10, 2011
Filed:
Jun. 29, 2007
Daniel Fishman, Lakewood, NJ (US);
Alan Gnauck, Middletown, NJ (US);
Yuan-hua Kao, Holmdel, NJ (US);
Xiang Liu, Marlboro, NJ (US);
Daniel Fishman, Lakewood, NJ (US);
Alan Gnauck, Middletown, NJ (US);
Yuan-Hua Kao, Holmdel, NJ (US);
Xiang Liu, Marlboro, NJ (US);
Alcatel-Lucent USA Inc., Murray Hill, NJ (US);
Abstract
An apparatus and a method for accurately detecting Loss of Optical Power (LOS) by noise power cancellation effect and optical power is measured at two output ports of an athermal periodic filter, wherein one output port in the optical frequency domain, is aligned with the signal channels of an input WDM signal (on-grid port), whereas the second output port is aligned complementary to the first output port (off-grid port). In a preferred embodiment, the apparatus computes the ratio of the measured optical powers at the two output ports of the periodic filter, and comparing them to a threshold value that is determined from the overall common-mode rejection ratio (CMRR) of the detection apparatus. In an alternative embodiment, the apparatus additionally compares the optical power measured at the on-grid port to a threshold power that is determined from system design parameters.