단일 모드 광원이 집적된 Mach-Zehnder 간섭계형 파장 변환기를 제작하여 세계 최초로 10 Gb/s에서 파장 변환 특성을 확인하였다. 제작된 파장 변환기는 수동 도파로 영역에서의 전파 손실을 줄이기 위해 undoped InP 층이 수동 도파로 위에 형성된 새로운 BRS 구조를 사용하였다. 단일 모드 광원으로 손실 결합형 분포 궤환형 반도체 레이저(loss-coupled distributed feedback laser, LC-DFB LD)를 사용하여, 파장 변환기에 있는 반도체 광증폭기의 주입전류가 200 ㎃까지 측모드 억제율이 30㏈ 이상의 값을 나타내었다. 제작된 LC-DFB LD 집적 파장 변환기는 10 Gb/s의 동적 파장 변환 특성 측정 결과, 7㏈ 정도의 소광비를 갖는 eye 패턴을 얻을 수 있었으며, power penalty는 10^(-9) bit error rate에서 2.8 ㏈의 값을 나타내었다.
KSP Keywords
Distributed feedback lasers(DFBs), Mach-Zehnder(MZ), bit error
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