Abstract
본 논문에서는 조명용 LED를 광원으로 사용한 무선 광통신 시스템에서 광전 궤환을 이용한 ASK 변조 방식을 사용하여 잡음 광의 간섭을 소거하였다. 광전 궤환 회로의 발진을 이용하여 70 kHz의 반송파를 자체적으로 생성하였으며, 입력 신호를 사용하여 궤환 회로의 단락과 개방을 반복함으로써 9.6 kbps의 데이터 속도로 출력광을 ASK 변조하였다. 주변의 잡음 광이 존재하는 환경에서 광전 궤환을 이용한 ASK 변조 방식을 사용함으로써 신호대 잡음비가 약 25 dB 개선되었다. In this paper, we reduced the optical noise interference using the ASK modulation with optoelectronic feedback in a wireless optical system in which a lighting LED is used as a light source. The carrier frequency of 70 kHz was generated internally by the oscillation in the optoelectronic feedback circuit, and the output light was ASK modulated at a data rate of 9.6 kbps by opening and shortening the feedback loop with the input signal. In an environment with adjacent noise lights, the ASK modulation with optoelectronic feedback improved the signal to noise ratio by about 25 dB.
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