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. 06, 1991
Filed:
Jul. 19, 1990
Julian Stone, Rumson, NJ (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
In this invention there is disclosed an optical filter disposed on an optical fiber. More specifically, a filter comprised of a multilayer thin-film stack of low and high index of refraction material is deposited onto the end of an optical fiber. The filter can be, for example, a long-pass filter, a Fabry-Perot Etalon, a Double-Cavity Filter, and the like. Filters deposited on perpendicular facets of single-mode fibers reflect most of the power that is not transmitted. This reflection if fed back to a laser or an amplifier can cause a problem, particularly if an isolator does not adequately block the reflections. A bevel on the fiber end face can eliminate this problem by preventing the reflected power from being directed back into the optical fiber.