멀티레벨 APSK 변조 방식을 사용한 광전송시스템의 전송성능과 진폭비율의 상관관계
Effect of Amplitude Ratio on the Performance of APSK-modulated Optical Transmission Systems
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초록
본 논문에서는 멀티레벨 APSK (ASK-DQPSK) 변조 방식을 사용한 광전송 시스템의 성능과, 두 진폭변조 레벨들의 비율 사이의 관계를 컴퓨터 시뮬레이션을 통하여 연구하였다. 진폭 비율의 변화에 따른 성능의 변화를 백투백 및 전송 시뮬레이션 이후에 Monte-Carlo 시뮬레이션으로 측정하였으며, 전송 후에는 전송 전에 비해 최적의 전송 성능을 얻을 수 있는 진폭비율이 줄어드는 것을 확인하였다. 이는 DQPSK 변조가 ASK 변조에 비해서 광섬유의 비선형성에 취약하기 때문에 발생한다.
Abstract
In this paper we studied the effect of the ratio of amplitude levels on the performance of the WDM optical transmission systems using multi-level APSK (ASK + DQPSK) modulation format. By measuring the BER performance variation as a function of amplitude ratio using Monte-Carlo simulations, we found that the optimal amplitude ratio after transmission is smaller than the one at back-to-back. This can be explained by the vulnearability of the DQPSK modulation to fiber nonlinearities compared to the ASK modulation.
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