Abstract: The attenuator for optical fibers with attenuating fiber according to the present invention comprises an optical fiber having a profile of reflective index with partially depressed cladding, of a length equal to the one of the whole attenuator, drugged with chemical substances like ions of transition metals and elements of rare earth, for creating a uniform spectral attenuation in the field of wavelengths between 1260 nm to 1650 nm.

Abstract: The optical terminator device according to the present invention comprises a portion of fiber of the same kind of the fiber to be terminated, inserted in a zirconium rod with cup and conveniently lapped on both end surfaces, whereby the end of the fiber portion, which in the connection with the fiber to be terminated, gets into contact with the connector of the latter by means of an optical connector, is lapped like a connector, while the other end is lapped at an angle &agr; with respect to the plane normal to the central axis of the fiber and with a determined degree of sharpness.

Abstract: A fibre optic attenuator (201) with spectral response independent of the incident radiation wavelength is formed by a method comprising a controlled series of compressive stressing and subsequent relaxation, or of relaxation alone, of the core of an optical fibre (30) (which can be of standard type or special type), which is simultaneously softened by local heating produced by a heat source. The application of further heating, in the absence of mechanical stressing of the deformed optical fibre (30), facilitates the attainment of the required attenuation.