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. 31, 2005
Filed:
Sep. 16, 2002
LI Chen, Fremont, CA (US);
William Yang, Fremont, CA (US);
Charlie Zhang, Fremont, CA (US);
Danny Yu, Fremont, CA (US);
Li Chen, Fremont, CA (US);
William Yang, Fremont, CA (US);
Charlie Zhang, Fremont, CA (US);
Danny Yu, Fremont, CA (US);
BaySpec, Inc., Fremont, CA (US);
Abstract
An optical gain flattening filter for attenuating the wavelength power levels of an optical beam to a threshold value. The filter has a series of volume phase gratings which each have a loss spectrum. The sum of the loss spectra for the volume phase gratings is about equal to the opposite of the gain spectrum of the optical amplifier. As the optical beam passes through the volume phase gratings, the sum of the loss spectra is added to the gain spectrum of the optical amplifier such that the optical beam is attenuated to the threshold value.