한국광학회지 (Korean Journal of Optics and Photonics)

  • 제12권3호
  • /
  • Pages.212-218
  • /
  • 2001
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  • 1225-6285(pISSN)
  • /
  • 2287-321X(eISSN)
한국광학회 (Optical Society of Korea)
권호 표지

소광비, 처핑 및 자기위상변조가 2.5Gbit/s 직접변조한 DFB-LD의 전송성능에 미치는 영향

The effect of extinction ratio, chirp and SPM on transmission performance of directly modulated 2.5 Gbit/s transmitter

  • 김근영 (한국통신 가입자망연구소) ;
  • 이용기 (한국통신 가입자망연구소)
  • 발행 : 2001.06.01
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초록

직접변조한 2.5Gbit/s 송신기에 있어서 DFB-LD에 인가되는 바이어스 전류에 따른 출력 광신호의 소광비와 처핑의 관계를 살펴보았고, 이상분산 영역 전송실험을 통행 변조된 광신호가 8-10dB의 소광비를 가질경우(바이어스 전류가 발진임계전류의 1.5배에서 1.8배) 소광비와 처핑으로 인한 총 전송 패널티가 최소가 됨을 알 수 있었다. 또한 240km 이상분산 영역 전송실험을 통해 직접변조된 광신호의 소광비와 SPM의 상관관계도 분석하였다. SPM을 고려할 경우 본 실험과 같은 구성에서 전송거리가 200km 미만인 경우는 10.2dB의 소광비에서 200km 이상인 경우는 8.4dB의 소광비에서 가장 좋은 수신감도를 얻을 수 있었다.

We experimentally investigated the dependence of extinction ratio and chirp on bias current which was injected into DFB-LD in a directly modulated 2.5 Obitls transmitter. Through the abnormal dispersion transmission, we found that transmission power penalty is minimized at 8-10 dB extinction ratio (bias current at 1.5-1.8 fold above threshold current). Also, we discussed the relation between extinction ratio and self phase modulation (SPM) through the 240 km abnormal dispersion transmission. When SPM takes effect, we obtained the best receiver sensitivity for specific system configuration at 10.4 dB and 8.4 dB extinction ratio, below and above 200km transmission distance, respectively. ively.

키워드

참고문헌

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