OPTICAL LOGICAL ELEMENT

Japanese Patent JPH04180036

A

PURPOSE:To obtain the optical logic element of an ultra-high speed by using the bond quantum wells of small absorption and small effective carrier life. CONSTITUTION:An incident surface 23 is formed in such a manner that the active layers 22 formed by alternately laminating about 40 layers each of the bond quantum well layers 1 pinching 1st quantum well layers with 1st barrier layers and 2nd quantum well layers and 2nd barrier layers 221 attain about 16.8 deg. angle with the layer surface. The 1st quantum level Ee1 of the electrons and the 1st quantum level Eh1 of the holes of the 1st quantum well layers and the 1st quantum level Ee2 of electrons and the 1st quantum level Eh2 of holes of the 2nd quantum well layers in the bond quantum well layers are so determined as to satisfy Ee1>Ee2 and Ee1-Eh1