| 摘要 |
PROBLEM TO BE SOLVED: To assure high speed of an element and also raise element efficiency while a plurality of electric signals are outputted from a single photodetector. SOLUTION: On a substrate 1, a first electrode layer 2 of a first conductive type semiconductor, a first light-absorption layer 3 which absorbs signal light, a first carrier travel layer 4, a second electrode layer 5 of a second conductive type semiconductor, a second carrier travel layer 6, a second light absorption layer 7 which absorbs signal light, and a third electrode layer 8 of a first conductive type semiconductor, are stacked in this order. At the layers 2, 5, and 8, first second, and third electrodes 9, 10, and 11 are formed, respectively.
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