Abstract: The active vacuum cleaner nozzle of the invention exhibits a two-part housing having an attached suction pipe connecting socket. The two housing parts are pivotably hinge-connected to each other at their end opposite to the suction pipe connecting socket, the dividing joint between the two housing parts extending at least into the area of the suction pipe connecting socket. On the suction pipe connecting socket, a locking sleeve is disposed such that it can be displaced between a position enabling the housing to be opened and a locking position and such that it can be locked in place.

Abstract: An optical link exhibiting net gain without the use of optical or electronic amplifiers. The link includes a high-power laser, a high-sensitivity external modulator for intensity modulating the laser output, an optical fiber, and photodiode detector. The electrical input port of the external modulator is impedance-matched to the output port of an electrical signal source using a transformer double-tuned circuit. The link exhibits electrical transfer efficiency (i.e., gain) proportional to the square of the optical bias power and modulator sensitivity, and much lower insertion loss than prior art links. The link can be advantageously used wherever low-insertion loss, high bandwidth, and low distortion transmission of electrical signals is required over distances up to ten kilometers.