Siemens Aktiengesellschaft

Christian Gerndt

Hartmut Schneider

Holger Karstensen

Armin Staudt

Helmut Zarschizky

Means for connecting electronic devices for communication with one

Optical fiber composed of a glass doped with at least laser-active ions of an element from the rare earths. An optical fiber of glass, preferably a HMF glass, doped with Tm.sup.3+ is operated at 1.48 .mu.m as a fiber laser or amplifier on the laser transition .sup.3 F.sub.4 -.sup.3 H.sub.4. Since this thereby involves a self-saturating transition, the terminal level is emptied in accelerated fashion for a continuous wave mode by co-doping with de-activators, preferably Ho.sup.3+, Tb.sup.3+, Eu.sup.3+ and/or Pr.sup.3+ ions. The pump light wavelength can be selected from the wavelength range from 700 through 890 nm of GaAlAs emission. The optical fiber can be used in optical amplifiers or fiber amplifiers.

Optical fiber composed of glass doped with laser-active ions of an

A branching arrangement for communication transmission links having a branching zone between an incoming cladded optical glass fiber and a plurality of outgoing cladded optical glass fibers with each of the glass fibers having a core enclosed in a casing characterized by the glass fibers being free of the cladding in the area of the branching zone, the core of the incoming glass fiber being surrounded by the cores of the outgoing glass fibers with the axes of all of the cores being parallel and the cores of the outgoing glass fibers being separated from the core of the incoming glass fiber by an interposed intermediate material, and the cores of the incoming and outgoing glass fibers and the intermediate material being surrounded by a casing material which has an index of refraction lower than the index of refraction of the cores and the intermediate material having an index of refraction which is approximately equal to the index of refraction of the cores.

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Geretsried, Germany

Christian Gerndt