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:
Sep. 03, 2002
Filed:
Dec. 15, 1999
George A. Rakuljic, Santa Monica, CA (US);
Anthony S. Kewitsch, Santa Monica, CA (US);
Arroyo Optics Inc., Santa Monica, CA (US);
Abstract
Optical filter devices in accordance with the invention are based on tapered optical fibers having transversely distributed refractive index variations in a small diameter waist region where waves are propagated in combined cladding/air-guided modes. The grating has a periodicity selected for reflection of a selected center wavelength and the waist diameter and grating pattern split the wavelengths of the lossy cladding modes from the backreflected signals by more than 10 nm. Such wavelength selective optical fiber devices have a variety of applications. In one application, a tapered fiber grating with optical circulators is used to add or drop optical signals for communication via a common transmission path. In another application, the tapered fiber grating is used with grating assisted mode couplers and circulators to form an add/drop multiplexer. In another application, these components are used with optical switches to produce programmable add/drop filters and crossconnects.