Optical filter on optical fiber end face

Details Optical filter on optical fiber end face Optical filter on optical fiber end face

1990-07-19

1991-08-06

Healy, Brian

Optical waveguides

Optical fiber waveguide with cladding

385 31, 359890, G02B 610, G02B 520

Patent

active

050371800

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.

REFERENCES:
patent: 4358851 (1982-11-01), Scifres et al.
patent: 4759596 (1988-07-01), Po et al.
patent: 4768849 (1988-09-01), Hicks, Jr.
patent: 4867520 (1989-09-01), Weidel
patent: 4892388 (1990-01-01), Taylor
patent: 4952798 (1990-08-01), Graham et al.
patent: 4958897 (1990-09-01), Yanagawa et al.

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