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:
Jun. 16, 1987
Filed:
Jun. 28, 1985
Eugene I Gordon, Convent Station, NJ (US);
AMP Incorporated, Harrisburg, PA (US);
Abstract
A channel add/drop filter-coupler includes two single-mode optical fibers that have different refractive index profiles. Each optical fiber has a propagation constant that is a function of frequency. A portion of the cladding of each fiber is removed to form a planar surface on each fiber. A plurality of channels is formed in one or both of the planar surfaces. The channels are spaced with a predetermined channel period that is inversely proportional to the difference between the propagation constants of the two fibers of the filter-coupler at the desired center frequency of the filter-coupler. The filter-coupler is completed by joining the two fibers at the planar surfaces. The coupling of the filter-coupler may be tuned by moving one fiber longitudinally, angularly, or, preferably, laterally with respect to the other fiber. Furthermore, the filter response of the filter-coupler is advantageously shaped by varying the location of the channels within the predetermined channel periods or by varying the depth or the width of the channels.