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. 16, 2005
Filed:
Jul. 24, 2003
Gang He, Quebec City, CA;
Daniel Gariépy, Stoneham, CA;
Gang He, Quebec City, CA;
Daniel Gariépy, Stoneham, CA;
EXFO Electro-Optical Engineering Inc., Vanier, CA;
Abstract
A dual-channel, double-filtering, multi-pass OSA having a narrow spectral linewidth response and high ORR comprises a diffraction grating (DG), two input ports (P, P″) for directing first and second input light beams (LR, LT) onto the grating; a retroreflector (RAM) for returning the dispersed light beams to the grating for dispersion again; two intermediate output ports (P, P) for receiving the twice-dispersed light beams; two secondary input ports (P, P) coupled to the intermediate output ports by polarization-maintaining waveguides (PMF, PMF) for directing the light beams onto the grating a third time, with their SOPs having a predetermined orientation relative to the SOPs of the first and second light beams when first incident upon the grating, the retroreflector (RAM) returning the three-times-dispersed light beams to the grating for dispersion a fourth time; and two output ports (P, P) for receiving the light beams after dispersion the fourth time.