조명전기설비학회논문지 (Journal of the Korean Institute of Illuminating and Electrical Installation Engineers)

  • 제22권12호
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  • Pages.164-175
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  • 2008
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  • 1229-4691(pISSN)
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  • 2287-5034(eISSN)
한국조명전기설비학회 (The Korean Institute of IIIuminating and Electrical Installation Engineers)
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카세그레인 광학계를 사용한 광무선통신 시스템에서 550[nm], 850[nm] 및 1550[nm]의 광 파장에 대한 안개 및 포인팅의 에러의 영향에 대한 해석

Numerical Study on the Wireless Communication at 550[nm], 850[nm] and 1550[nm] Wavelength LD in Fog and Pointing Error using Cassegrain Optics

  • 홍권의 (김포대학교 정보통신과)
  • 발행 : 2008.12.31
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초록

안개 및 대기의 교란이 광무선 통신에 주는 영향을 해석하기 위해 가시광선영역의 LD(laser diode) 및 적외선 영역의 LD 사용하고, 카세그레인 광학계를 이용하여 광을 송수신하게 하였으며, 광 소신소자로는 APD(avalanch photo diode)를 사용함을 가정하여 대기 중의 안개의 정도에 따른 가시도 및 교란의 세기를 나타내는 굴절률 구조상수에 따른 광 수신 전력, 잡음 전력을 고려한 SNR(signal to noise ratio)을 계산해 보고 각각의 통신 상태에서 BER(bit error rate)이 $10^{-9}$이 가능한 통신 거리를 알아보았다.

Atmospheric effects on laser beam propagation can be broken down into two categories: attenuation of the laser power and fluctuation of laser power due to laser beam deformation. Attenuation consists of scattering of the laser light photons by the fog. Laser beam deformation occurs because of small-scale dynamic changes in the index of refraction of the atmosphere. This causes pointing error. In order to analyse these effect on optical wireless communication system, in this paper uses cassegrain optics as a transmitting and receiving telescope, AID as a detecting device and ill as a light source. The signal modulating and demodulating method is a IM/DD. I show the effects of fog and pointing error and calculate the possible communication distance for BER is $10^{-9}$.

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참고문헌

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