Proximion Fiber Systems Ab

Johan Pejnefors

Bengt Sahlgren

Sten Helmfrid

Bengt Johansson

Raoul Stubbe

Mikael Bergman

A spectrally selective optical coupler is disclosed, comprising a first and a second waveguide; an external resonator defined by at least a first and a second mirror; and a respective deflecting portion in each of said waveguides for coupling light between the waveguide and the external resonator. The waveguides are arranged between the mirrors adjacent to each other in a plane that is generally parallel to said mirrors; and the external resonator is designed such that a resonant mode within the external resonator overlaps the deflecting portion in the first and the second waveguide. The inventive coupler solves some limiting geometrical problems encountered in the prior art. A lateral extension of a mode in the external resonator overlapping both waveguides is obtained using a curved resonator mirror or refractive elements or portions within the resonator.

Optical add/drop multiplexers

The invention is a spectrally selective optical coupler with a new geometry and a new principle of action. An optical coupler according to the invention comprises an optical fiber and an external lightguide. In the fiber there is provided a deflector that is operative to deflect light of a predetermined wavelength into a propagating mode of said lightguide. The outcoupled light is transferred to a region remote from the outcoupling portion of the fiber. The invention can be used to couple light from a first to a second optical fiber.

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Danderyd, Sweden

Johan Pejnefors