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A Study on the Limit of Dynamic Rrange Improvement of Complementary Con-elation OTDR Caused by the Increased Measurement Cycle at Long Code Length  

김동선 (서울대학교 전기컴퓨터공학부)
박재홍 (서울대학교 전기컴퓨터공학부)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.40, no.11, 2003 , pp. 19-28 More about this Journal
Abstract
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.
Keywords
OTDR; CCOTDR; Golay code; dynamic range; correlation;
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