Yonsei Univ. High-Speed Information Transmission Lab. Lect. 2-4 Optical Fiber 2003. 4. 28 (Mon.) d n2n2 n1n1 n2n2 Even solutions: Odd solutions: y=0 y=d/2.

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Yonsei Univ. High-Speed Information Transmission Lab. Lect. 2-4 Optical Fiber (Mon.) d n2n2 n1n1 n2n2 Even solutions: Odd solutions: y=0 y=d/2

Yonsei Univ. High-Speed Information Transmission Lab. Lect. 2-4 Optical Fiber (Mon.) Linear Polarization fiber 내에서 빛이 통과할때는 Ez 와 Hz 성분을 모두 갖는 hybrid modes 를 가진다. 그러나 굴절률차이가 아주 작은 (Δ<<1) 경우에는 거의 plane polarized 된 traveling waves 로 보이게 된다. 이런 waves 를 linearly polarized(LP) 라고 부르고, 이들은 transverse electric and magnetic field 특성을 모두 갖는다. Lp lm mode 는 아래와같이 표현이 가능하다. 2xl : max peak # along φ M : max peak # along r

Yonsei Univ. High-Speed Information Transmission Lab. Lect. 2-4 Optical Fiber (Mon.) Modes in step index fiber V-number (normalized frequency) Normalized propagation constant,b 우측 그림에서 볼 수 있듯이 V-number 가 보다 작으면 single mode 가 된다.

Yonsei Univ. High-Speed Information Transmission Lab. Lect. 2-4 Optical Fiber (Mon.) Attenuation in Optical fibers 우측 그림은 silica 를 기본 물질로 사용하는 fiber 의 파장에 따른 attenuation 을 나타낸다. Rayleigh scattering 과 Lattice absorption 에 의해서 fundamental limit 이 정해진다. 1310nm 와 1550nm 에서 loss 의 deep 이 생 기는 것을 볼수 있다. Typical optical fiber 는 1550nm 에서 0.2dB/km 의 attenuation coefficient 를 갖는다. Ex) α dB =0.3dB/km 일때 Pin=1mW 이면 Pout=0.5mW 가 되는 거리 L 은 ?

Yonsei Univ. High-Speed Information Transmission Lab. Lect. 2-4 Optical Fiber (Mon.)

Yonsei Univ. High-Speed Information Transmission Lab. Lect. 2-4 Optical Fiber (Mon.)

Yonsei Univ. High-Speed Information Transmission Lab. Lect. 2-4 Optical Fiber (Mon.)