In the present thesis, the optical reflection and the insertion loss measurement system is designed to be composed of the optical direction coupler, which derives the optical transmission of a message part and reflected light to the department of sphere optical. As a consequence of this study, an optical technology that can measure microscopic optical up to 0~-60dBm and a technology that can derive stable laser are obtained. This thesis also contributes to the resolution of the problem, which uniforms measured values for the different optical spare parts, and which is found in a mass production process including optical transmission step, through the algorithm of repeated error modification as well as moving average arithmetic method.
The present study uses dual optical source whose distributed feedback laser diode is λ = 1310㎚ and λ = 1550㎚ from the central wavelength and InGaAs pin photo diode for the receiving optical department. The measurement range for optical reflection loss as well as insertion loss was 0~-60㏈m with disjointing of 0.01dB and stability of 0.1dB/h.