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설순권,이성호 서울産業大學校 1999 논문집 Vol.49 No.2
Differential detection is used in a wireless optical repeater in order to reduce the environmental optical noise. A differential detector is composed of two photodiodes and a differential amplifier. When the differential gain ratio equals to the optical noise coupling ratio the optical noise effect is reduced. The differential detection is very effective in removing the environmental optical noise or interference from an adjacent optical channel.