Performance testing apparatus for free space optics system

An apparatus for measuring performance in a space optical communication system is provided to optimizing lighting performance and communication performance by measuring the compatibility of an optical transmitter-optical receiver pair using an existing optical transmitter and receiver and finding out optimal distances, optimal horizontal angles, and optimal vertical angles. An apparatus for measuring performance in a space optical communication system comprises a PPG(Pulse Pattern Generator), an OSC(Oscilloscope), an ED(Error Detector), the first and second regulators, and a controller. The first regulator, on which an optical transmitter is mounted, varies location of the optical transmitter according to a command from the controller. The second regulator, on which an optical receiver is mounted, varies location of the optical receiver according to a command from the controller. The PPG generates a performance measuring data signal to be inputted to the optical transmitter and trigger signals to be respectively inputted to the OSC and the ED. The OSC measures an eye diagram according to the trigger signal and a data signal inputted from an RX signal connection part. The ED, receiving the trigger signal and a data signal inputted from the RX signal connection part, measures a BER(Bit Error Rate). The controller varies the data signal generated from the PPG, receives the eye diagram of each data signal from the OSC, obtains the measured BER from the ED, analyzes performance characteristics, and regulates the locations of the optical transmitter and the optical receiver on the basis of the analyzed performance.