A considerable amount of area can be saved according to the present invention by reducing the number of input ports and the number of output ports to the number n of concurrently intended array accesses. A fifth electrically insulating layer partially covers these layers. Meanwhile, of the light outgoing from the optical amplifying section, a light quantity controlling section controls the light quantity of light proceeding a predetermined optical path to a wavelength conversion section, which controls the light quantity of light outgoing from wavelength conversion section as outgoing light of the light source unit.