장거리 광신호 전송 최적화를 위한 고급 변조 기술의 성능 실험
Experimental Performances Using Advanced Modulation Formats for Optimization of Long Haul Transmission of Optical WDM Signals
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초록
WDM 광신호 장거리 전송을 위해 고가의 신기술 채택을 배제하고 경제적으로 의미 있는 표준 단일모드 광섬유만을 사용하고 광증폭기로는 EDFA만을 사용하는 링크를 구성한 뒤 전송 성능 최적화를 위해 RZ, CRZ, VSRZ 세가지 변조 기술을 하드웨어 실험으로 비교한다. 실험을 위해 장거리 전송 링크가 꾸며지는데 recirculation loop를 이용하며 100km 증폭 구간이 사용된다. 정확한 변조 기술 성능 비교를 위해 각각의 변조 신호 발생 과정이 최적화되며 그 특성들이 컴퓨터 시뮬레이션과 비교된다. 각각의 변조 포맷에 대해 전송 조건의 최적화 실험이 수행되는데 이 과정을 통해 링크 상에서 광신호의 최적 입력세기가 구해진다. 이 같은 최적조건들을 이용하여 2400km 후치보상된 광신호 전송에서 세가지 변조 포맷의 전송 성능이 비교된다.
Abstract
We systematically compare transmission performance of three different modulation formats, RZ, CRZ and VSRZ on the economically effective transmission link using standard single mode fiber (SSMF) and all Erbium-doped fiber amplifiers (EDFAs). The generation of each modulation format in experiments is optimized for exact comparison, and their optical characteristics are investigated by comparing with simulation results. Optimum input powers into SSMF and dispersion compensation fiber (DCF) for all four formats, non-return-to-zero (NRZ), return-to-zero (RZ), chirped RZ (CRZ) and vestigial sideband RZ (VSRZ), were explored and CRZ signal showed the lowest input power as -4 dBm per channel into SSMF, and -8 dBm per channel into DCF, respectively. In our cost-effective transmission link, CRZ gave best performance among all the formats investigated.
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