| 摘要 |
PROBLEM TO BE SOLVED: To select optional one-a plurality of input electric signals among a plurality of the input signals and to superimpose them respectively and extract them from a plurality of output sections independently respectively without being affected by induction interference or noise in the changeover device for a high frequency electric signal for a CATV or the like. SOLUTION: Input electric signals 1-6 are converted into optical signals by electrooptic converters 13 and distributed by one-input three-output optical ranching devices 15. Nine 2-input 1-output optical witches 16 are grouped into three respectively and each group all the optical signals and the three kinds of the signals selected optionally are superimposed by a 3-input 1-output photocoupler 17 and its output is converted into an electric signal by a photoelectric converter 18 and outputted. |
