Abstract: A device for feeding optical fibers into a tubular element, duct, or the like. For ease of handling, the fiber feeding device includes a channel into which there can be inserted a bar which includes one or more longitudinally extending blow passages, where each passage has a cross-section that is adapted to a given type of optical fiber. Holes are provided in the bottom surface of the channel close to its respective rear and front edges, for delivering and removing compressed air used to advance the optical fiber. With the optical fiber placed in the blow passage in the bar, the optical fiber in said passage will be advanced when compressed air is delivered through the holes in the rear edge of the bar, by virtue of the blow passage functioning as a Venturi tube where a leakage flow exerts an ejector effect on the optical fiber to promote advancement of said fiber through the blow passage.

Abstract: A device for feeding optical fibers into a tubular element, duct, or the like. For ease of handling, the fiber feeding device includes a channel into which there can be inserted a bar which includes one or more longitudinally extending blow passages, where each passage has a cross-section that is adapted to a given type of optical fiber. Holes are provided in the bottom surface of the channel close to its respective rear and front edges, for delivering and removing compressed air used to advance the optical fibre. With the optical fiber placed in the blow passage in the bar, the optical fiber in said passage will be advanced when compressed air is delivered through the holes in the rear edge of the bar, by virtue of the blow passage functioning as a Venturi tube where a leakage flow exerts an ejector effect on the optical fiber to promote advancement of said fiber through the blow passage.

Abstract: To simplify handling of optofiber ribbons, there is provided a component for cross-connecting optofibers between different fiber ribbons, where the component pre se cross-connects optofibers between different fiber ribbons connected to the component. The component enables a fiber ribbon structure to be retained and undivided, even after cross-connecting or otherwise reorganizing the optofibers in one or more fiber ribbons. The cross-connecting components generally consist of a plastic casing (6,7) which surrounds optofibers (2) cross-connected or reorganized in a mixing zone or weave zone (5) and also the free optofiber-ends connected to the optofibers in the plastic casing on a component input side and a component output side respectively.

Abstract: An optical fibre cable for temperature detection comprises an optical fibre and a temperature-responsive swellable body. The fibre and the swellable body are held together by a helically-wound wire. The swellable body includes an elastic tube which contains wax having a given melting point. When the wax melts, it expands in volume and causes the tube to swell and therewith stretch the wire, resulting in the bending of the optical fibre. The fibre cable (6) is used in an OTDR-system. The propagation of light pulses is measured and a heated section of the fibre cable is detected through the detection of attenuated, reflected light pulses. A desired light attenuation in a range of from 0.01-0.1 Db/m can be obtained by appropriate selection of the parameter values of the fibre cable for example the pitch of the wire helix and the volumetric expansion of the wax. This enables the locations of several heated sections along the fibre cable to be established.

Abstract: The present invention relates to a laser resonator comprising active material disposed in an optical resonator cavity of the folded type including two parallel ray paths, means for exciting the active material, a common end reflector to limit the resonator cavity so that when the active material is excited an oscillating radiation is generated in the resonator cavity, a corner cube prism comprising a number of reflective surfaces for making, by successive reflections, the reflected radiation parallel to the incident radiation, a beam dividing polarizer on one reflective surface of the prism, through which the laser output occurs, and a Q-switching means for providing pulsed lasing.