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. 03, 1998
Filed:
Apr. 04, 1996
Adrien Bruno, Palaiseau, FR;
France Telecom, , FR;
Abstract
The invention relates to a multi-wavelength filter that is insensitive to polarization, comprising a bundle of optical waveguides made on a common substrate and organized in such a manner that the wavelength response of the filter depends on the phase shifting to which the light propagating in the waveguides is subject. The filter also comprises polarization rotators placed on the path of the light in such a manner that in each of the optical waveguides the light paths for the TE and TM polarization modes are of equal length. The polarization rotators are of the type comprising means for loading each optical waveguide and for creating asymmetry in the effective refractive index thereof.