Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Low cost optical add/drop module for WDM optical communication networks

WDM 광통신망을 위한 저가형 광신호 삽입/추출 모듈 구현

  • 이상화 (서원대학교 컴퓨터정보통신공학부) ;
  • 송해상 (서원대학교 컴퓨터정보통신공학부) ;
  • 안대영 (서원대학교 컴퓨터교육과)
  • Published : 2003.12.01
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Abstract

We propose a novel structure of wavelength selective optical add/drop filter comprising two tap couplers and a fiber Bragg grating. The device has unique features including a simpler structure and a lower cost implementation as compared with existing device for the same operation. The filter performance has been measured and analyzed, experimentally. The implemented prototype filter shows good performance with no­crosstalk power penalty in a 155Mbps per channel wavelength­division­multiplexing transmission system but suffers from a relatively high loss of 3.5㏈ and 21㏈ for transmitted and dropped channel, respectively. While the dropped channel extinction ratio was more than 15㏈, the transmitted channel extinction ratio was more than 26㏈.

광섬유 브라그 격자와 광 분기 결합기로 구성된 새로운 구조의 파장 선택형 광신호 삽입/추출 모듈을 제안하였다. 제안된 광신호 삽입/추출 모듈은 동일한 동작을 수행하는 기존의 모듈에 비해 매우 단순한 구조를 가지고 있으며 초저가로 구현이 가능하다는 장점을 갖고 있다. 제안한 모듈의 동작 특성을 실험적으로 측정 및 분석한 결과, 155Mbps급의 전송속도를 갖는 WDM 전송 시스템 내에서 no­crosstalk power penalty를 가짐을 확인하였다 출력 단에서 투과되는 채널의 삽입 손실은 3.5㏈ 이하이었고 추출 단으로 추출되는 신호의 삽입 손실은 21㏈ 이하로 비교적 높은 값을 가졌다. 반면에 추출된 신호의 채널 소광비는 15㏈ 이상이었고 투과되는 신호의 채널 소광비는 26㏈ 이상으로 상용화된 모듈과 비교해 거의 비슷한 수준의 값을 가짐을 확인하였다.

Keywords

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