Deutschetelekom Ag

Werner Frank

Wolfgang Dultz

Olaf Ziemann

Volker Maier

Juergen Kaufhold

Hans Strack

Jörg Happ

Angelika Stelmaszyk

To provide directionally dependent attenuation for an optical information transmission link using simple means without the use of an active component, it is proposed to couple two optical waveguides () having different core diameters to one another, the core diameter of the second fiber () being at least six times greater than the core diameter of the first fiber (). In this manner, it is achieved that the conduction of light signals in a predefined direction is attenuated by at least the factor 30, while, on the other hand, the light propagating in the reverse direction, is attenuated very slightly.

Optical fiber transmission link having passive, directionally dependent attenuation

In a method for producing graded-index profiles in polymeric optical fibers, ionizing radiation is used to cause an increase in the refractive index, for example in PMMA. Polymeric optical fibers, preforms or fiber-core preforms are irradiated with ionizing radiation of predetermined wavelength and dose while being moved past the radiation source in the longitudinal direction at a given speed and are subsequently tempered for a defined length of time. Through the control of the spatial distribution of the ionizing radiation with the aid of mirrors, lenses or aperture systems, a uniform, radial graded-index profile is produced over the entire fiber length, so that the polymeric fiber, used as an optical waveguide, has improved transmission characteristics for optical signals.

Method for producing gradient index refraction index profiles in polymer optical fibers

An optical branching element has an input waveguide (10) and a plurality of output waveguides (20a, 20b), which are so disposed at a distance from the input waveguide (10) that a beam of light launched into the input waveguide (10) over a coupling path of a predefined length couples over with a defined intensity into the output waveguides (20a, 20b).

Optical branching element

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Solnhofen, Germany

Werner Frank