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:
Mar. 04, 2003
Filed:
Jun. 13, 2001
Bo Cai, Herts, GB;
JDS Uniphase Corporation, , GB;
Abstract
The invention provides an optical filter having first wave retarding element for receiving an optical signal including a plurality of wavelengths, said first wave retarding element having a first periodic output response of a first phase versus wavelength for the optical signal. The optical signal is polarized when being launched into the first wave retarding element. A second wave retarding element receives the optical signal from the first wave retarding element. The second wave retarding element has a second periodic output response of a second phase versus wavelength for the optical signal. The first periodic output response and the second periodic output response are different from each other and non-integer multiples of each other. Advantageously, the gain flattening filter is tunable, cost effective, and compact in size. It is capable of producing any desired spectral curve without PDL by simply adjusting the angle of each wave retarding means. PMD and broadening is eliminated by orthogonal two-stage configuration.