대한전자공학회논문지 (Journal of the Korean Institute of Telematics and Electronics)

대한전자공학회 (The Institute of Electronics and Information Engineers)
권호 표지

파장변화에 따른 단 모드 광섬유의 스펙트랄 로스 및 차단파장 측정

Measurement of Spectral Loss and Cut-off Wavelength of Single Mode Opticla Fiber by Variable Wavelength

  • 홍봉식 (충남대학교 전자공업교육학과) ;
  • 한병성 (전북대학교 전기공학과) ;
  • 구경완 (충남대학교 전자공학과)
  • Hong, Bong Sik (Dept. of Elec. Eng., College of Ind, Edu. Chungnam National Univ.) ;
  • Han, Byoung Sung (Dept. Elec. Eng., Chonbuk National Univ.) ;
  • Koo, Kyoung Wan (Dept. of Elec. Eng., Chungnam National Univ.)
  • 발행 : 1986.02.01
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초록

A thchnique has been studied for the measurement of the spectral loss and the cut-off wave length, at which the first high-order mode disappears. The near-field patterns of a fiber which is excited by a variable wavelength source are used for the measurement of cut-off wavelength. Because of the absorptive phenomenon of OH- molecular vibration, spectral loss of a single mode optical fiber sample is 5.6dB/km at 1380 nm wavelength and 1dB/km at 1240 nm wavelength. From the near field intensity patterns and the mode field diameter graph for the half power width, the cut-off wavelength of the fiber is measured to be 1120 nm.

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