The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Protection/Restoration of PON Systems Using WDM based 2-OLT Structure

WDM 기반 2-OLT 구조를 이용한 PON 시스템 보호 및 절체

  • ;
  • 박영일 (국민대학교 전자공학과 광대역통신 연구실)
  • Received : 2012.08.14
  • Accepted : 2012.12.07
  • Published : 2012.12.28
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Abstract

In this paper, we propose a protection architecture of passive optical network (PON) system by using two optical line terminals (OLTs). Using this scheme, the network can sustain services to access area and restores normal operation in faulty conditions. Unlike existing systems, the proposed one increases the efficiency of the system by operating both OLTs using different wavelengths in normal condition. During protection mode, a Shared-bandwidth allocation scheme is employed to maximize the utilization efficiency. Performance analysis shows that the proposed scheme can provide reliability to Ethernet-based PON system very efficiently.

본 연구에서는 2개의 OLT를 이용한 PON 보호/절체에 관해 제안하였다. 본 제안된 방식을 이용하면 고장 상황에서도 가입자 영역에 서비스를 지속적으로 할 수 있고, 정상적인 동작을 수행할 수 있게 된다. 기존 보호/절체 방식과의 차이점은 제안된 방식의 경우 두 OLT에 다른 파장을 적용함으로써 정상 상태에서 두 OLT를 모두 사용하여 이용 효율을 높인다는 점이다. 보호 모드에서는 Shared-bandwidth 할당 방식을 적용함으로써 효율을 극대화하였다. 성능 분석을 통해 제안된 시스템이 효율적으로 이더넷 기반 PON 시스템의 신뢰성을 높일 수 있음을 확인하였다.

Keywords

Acknowledgement

Supported by : 한국연구재단

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