Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04B
TRANSMISSION
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10/00
Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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H04B10/291
in which processing or amplification is carried out without conversion of the main signal from optical form
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H04B10/297
Bidirectional amplification
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H04B10/2972
Each direction being amplified separately
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