트래픽의 급격한 증가와 함께 백본을 구성하는 광전송망은 비동기식(PDH) 기반에서 동기식(SDH/SONET) 기반으로 발전하여 왔으며, 최근에는 파장분할다중화(WDM) 기술을 적용한 장비가 보급되면서 광전송망을 구성하는 필수 기술로 자리잡고 있다. WDM 기술 적용에 따라 현존하는 SDH/SONET 망과 연동시 유지보수가 되지 않는 등 WDM 기술에 SDH/SONET 망을 직접 수용하는 데 어려움이 있어, 이를 해소할 수 있는 새로운 개념의 광전송계위(OTH)의 필요성이 대두되어 관련 기술을 개발하여 표준화가 이루어졌다. OTH 기술의 도입으로 WDM 기반 전송망과 기존 전송망과의 연동이 원활하게 이루어져 유지보수 및 운영상의 문제점을 해소할 수 있을 뿐만 아니라, 기존의 다양한 신호 트래픽과 새로운 서비스 등장에 따른 트래픽 수용 및 전송이 가능하게 되었다. 이 논문에서는 WDM 기반의 고속 전송에 필수적인 OTH 신호 전송을 위한 핵심 기술에 관해 분석하고 나아가 관련 기술개발 동향에 대해 기술한다.
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