동시 사용자의 간섭을 제거한 광 주파수 및 시간 영역 광 CDMA를 이용한 광 가입자 망의 제안
Proposal of optical subscriber access network to eliminate multiple access interference using 2 dimensional optical frequency and time domain CDMA method
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초록
무선통신에 널리 사용되는 PN(Pseudorandom Noise) 부호를 사용하여 생성 부호 수를 증가시키고 양극성 상관 수신기에서 가입자간 간섭잡음을 완전히 제거할 수 있는 2D 광 CDMA 방식을 사용한 광 가입자 망을 제안한다. 제안 시스템에서 특성을 수치적으로 분석한 결과 EIN(Excess Intensity Noise) 잡음이 지배적인 잡음전력인 것을 알 수 있다. 그리고 제안한 2D 광 CDMA 시스템에서 동시 사용 가능한 가입자의 수가 동일 성능조건하에 종래의 1D 광 CDMA 시스템보다 4배 향상된 것을 알 수 있다.
Abstract
In this paper, we propose optical subscriber access network to eliminate multiple access interference using 2 dimensional(D) optical frequency and time domain CDMA method. We have numerically analyzed the characteristics of proposed system. It is seen that the excess intensity noise is the major limiting factor to the system. Also it is seen that the number of simultaneous subscribers is four times as large as the conventional 1D optical system under the same bit error ratio.
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