Proximion Fiber Systems Ab

Ulf Öhlander

Bengt Sahlgren

Raoul Stubbe

Mikael Bergman

Simon Sandgren

Sten Helmfrid

Anders Henriksson

Adel Asseh

A spectrally selective optical switch is disclosed. The switch comprises a first and a second optical waveguide each having a light guiding structure arranged to guide light along a predetermined path, the optical waveguides being arranged adjacent and parallel to each other; an external resonator defined by a first and a second mirror, said first and said second mirror being provided on opposite sides and outside of said first and second light guiding structures, and said external resonator being resonant to a specific wavelength; and a deflector provided in each of said first and second optical waveguide, the deflectors being arranged to deflect light propagating in one of the light guiding structures to the other light guiding structure by operation of said external resonator. A matrix switch is also disclosed.

Wavelength selective switch

The invention relates to methods and arrangements for channel balancing of a wavelength division multiplexed optical signal. Channel balancing according to the invention is performed by using a resonator that provides a selection region in which a selected channel has a substantially increased poser density relative to channels out of resonance. The selected channel is attenuated a desired amount, i.e. a desired amount of power is removed therefrom, by adjusting the properties of the selection region. In a preferred embodiment, attenuation is achieved by adjusting the selection region such that destructive interference is obtained for the selected channel in a fiber carrying tile multiplexed optical signal.

Channel balancing of a wavelength division multiplexed optical signal

The invention relates to the coupling of light to and from an optical waveguide, such as an optical fiber. Light of a specific wavelength is deflected out from the fiber, or into the fiber, in a substantially transverse direction with respect to the propagation direction of light in the waveguide, by a deflectorarranged in the fiber coreWavelength selectivity of the deflectoris provided by a Bragg grating means located in the fiber coreThe deflected light is collimated, or converged towards a focus, by an interfacebetween a claddinghaving one index of refraction, and an outer mediumhaving another index of refraction. The ratio between the radius of the claddingand the radius of the coremade sufficiently small for the collimating, or converging, effect to appear.

Optical coupling

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Hässelby, Sweden

Ulf Öhlander