Siemens Aktiengesellschaft

Peter Moeckel

Gerhard Winzer

Hans F Mahlein

Achim Reichelt

Peter Baues

A probe for the non-contact measurement of electric or magnetic field strengths has two wave guides provided on a substrate. One of the wave guides has a measurement portion consisting of an electro-optical material or a magneto-optical material in a region of a measurement zone. A magnetic or electric field changes the index of refraction of the measuring portion and the intensity of a light wave traveling through this portion of the wave guide is reduced. Comparison is then made between a standard intensity in the other wave guide and a reduced intensity in the light traveling through the wave guide measuring portion.

Movable probe carrying optical waveguides with electro-optic or

Magnetically stored data, for example data stored on a magnetic tape is converted directly into optical signals by an arrangement which comprises a magneto-optical modulator and a wave guide laser. The wave guide laser has an index of refraction n.sub.2 and is arranged on a transparent substrate which has an index of refraction n.sub.3 by epitaxial growth. The magneto-optical modulator has an index of refraction n.sub.1 and is applied as an epitaxial growth to the wave guide laser. The indices of refraction fulfill the condition that n.sub.1 &gt; n.sub.2 &gt; n.sub.3.

Arrangement for the direct conversion of items of data stored in

A method of manufacturing a preform from which glass fibers are to be drawn including making a groove in a first cladding glass element, filling the groove with core glass, grinding or otherwise finishing the surface of the cladding element and the core glass to a flat surface and optically contacting a second cladding glass element to the finished surface of said first cladding glass element thereby covering the core glass material.

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Munich, Germany

Peter Moeckel