The present invention alters the frequency response of an optoelectronic device to match a driver circuit that drives the optoelectronic device. The bi-directional backside conduit is in fluid communication with a backside carrier gas supply line, and is further in fluid communication with a vacuum supply line. The controller performs a switching control that changes a first use mode to a second use mode on a basis of the information. Also, data of the second data stream are assigned to the signal points of each signal point group.