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Complementary Correlation OTDR에서의 긴 코드 길이에 따른 측정시간 증가에 의한 Dynamic Range 증가 제한에 대한 연구
金東瑄,박재홍 대한전자공학회 2003 電子工學會論文誌-SD (Semiconductor and devices) Vol.40 No.11
The limitation on the dynamic range improvement of the complementary correlation optical time domain reflectometer (CCOTDR) is presented. In CCOTDR, the improvement of dynamic range is function of both the averaging number of measurement cycles and the length of codes. The trade off between the averaging number and the code length restricts the improvement of the dynamic range and a very long code is not effective to improve the dynamic range. In this paper, the improvement limitation on dynamic range caused by the trade off between the averaging number and the code length is presented. For derivation of the trade off, the number of one measurement cycles employing a conventional single pulse method and employing a complementary code method are presented and compared. And the effective maximum code length is presented in addition.