Abstract: A switching system is provided for application to a multichannel digital transmission network. It allows a defective channel to be replaced by an emergency channel without the user of the channel being aware of the replacement. On the emission side as well as on the reception side, switching and processing take place of bipolar signals, for example a High Density Bipolar 3 code, which allows the path doubled or extended so as to increase the operating safety of the network and provide greater flexibility in use.
Abstract: A switching laser comprising, in a cavity, a cell of an amplification gas and a cell of an absorption gas, means for exciting said amplification gas and means for exciting said absorption gas. Said means for exciting the absorption cell comprise a radio frequency AC voltage source pulsed at a certain rate. The laser is namely used for infrared detection.
Type:
Grant
Filed:
December 4, 1984
Date of Patent:
January 13, 1987
Assignee:
SAT
Inventors:
Thierry R. Midavaine, Michel M. Ouhayoun
Abstract: The present invention relates to a process for passivation of photoconductive detectors constituted by Hg Cd Te, wherein a layer of native oxide is formed on the faces of an Hg Cd Te wafer and it is made to grow, by pure chemical oxidation in an aqueous solution of K.sub.3 Fe(CN).sub.6 and of KOH. An ordinary layer of ZnS is then formed on the oxide layer. The process makes it possible to produce high-performance infrared detectors, simply.
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