This investigation proposes and experimentally demonstrates optical signal processing using a 1.3μm quantum dot vertical-cavity surface-emitting laser in an external injection scheme. The quantum dot vertical-cavity surface-emitting laser is used to generate optical inverted and non-inverted data signals. Moreover, the polarization characteristics of quantum dot vertical-cavity surface-emitting laser are also examined experimentally. These works will be useful in the field of optical signal processing and quantum dot devices.