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:
Aug. 19, 2003
Filed:
Dec. 14, 2001
Vincent Delisle, Ottawa, CA;
Alan J. P. Hnatiw, Stittsville, CA;
JDS Fitel Inc., Ottawa, CA;
Abstract
The invention disclosed relates to a device for multiplexing/demultiplexing a multi-band DWDM system, providing reduced insertion losses. The device comprises first and second planar waveguides, a light dispersive element having a periodic frequency spectrum, interconnecting the first and second planar waveguides, a plurality of N input waveguides, connected to the first planar waveguide, and a plurality of M output waveguides, connected to the second planar waveguide, wherein the M outputs are each separated by a frequency interval &Dgr;f, the N inputs are each separated by substantially M*&Dgr;f, the free spectral range (FSR) equals substantially N*M*&Dgr;f, where N is an integer greater than 1, and M is an integer equal to or greater than N. In one embodiment of the invention, wherein the telecommunications window is divided into a plurality of sub-bands of M channels, a temperature controller is included to provide individual temperature set points for each sub-band, to reduce wavelength centering errors.