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 Lect. 3-4-(1) Optical Amplifier

 Lect. 3-4-(1) Optical Amplifier. 2003. 5. 19 (Mon.). ● About “ Semiconductor ”. Si : 4 족이므로 , Valence electron 이 4 개. * 구조의 특징 : 단단하고 안정적이다. +. Si. Si. …. …. 원자 수준에서는 discrete 한 energy level 이 결정이 되면 , energy band 가 된다.  Lect. 3-4-(2) Optical Amplifier. 2003. 5. 19 (Mon.).

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 Lect. 3-4-(1) Optical Amplifier

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  1.  Lect. 3-4-(1) Optical Amplifier 2003. 5. 19 (Mon.) ● About “ Semiconductor ” Si : 4족이므로, Valence electron 이 4개 * 구조의 특징 : 단단하고 안정적이다. + Si Si … … 원자 수준에서는 discrete한 energy level이결정이 되면, energy band가 된다.

  2.  Lect. 3-4-(2) Optical Amplifier 2003. 5. 19 (Mon.) At Conduction Band… Conduction Band E Band Gap k At Valence Band… Valence Band Band Gap : 의 관계에 따라서 Absorption, Spontaneous emission, Spontaneous emission 이 일어난다.

  3.  Lect. 3-4-(3) Optical Amplifier 2003. 5. 19 (Mon.) The E-k diagram of a direct bandgap semiconductor such as GaAs. The E-k curve consists of many discrete points with each point corresponding to a possible state, wavefunction on , that is allowed to exist in the crystal. The points are so close that we normally draw the E-k relationship as a continuous curve. In the energy range to there are no points( solutions). E E : Electron : Hole - 절대온도(0 K)에서는, 전자가 안정적이므로 모든 전자가 Valence Band에 모여있다. - - - - - 온도가 상승하면 k k

  4.  Lect. 3-4-(4) Optical Amplifier 2003. 5. 19 (Mon.) Free space wavelength coverage by different LED materials from the visible spectrum to the infrared including wavelengths used in optical communications. Hatched region and dashed lines are indirect Eg materials. E Conduction Band와 Valence Band의 peak 위치가 틀려서, pumping을 해도 빛이 나오지 않는다. 이러한 상태를 Indirect Bandgap 이라 하고 대표적으로 실리콘을 들 수 있다. 결국, 빛을 발생시키려면, Direct Bandgap이어야 한다. k

  5.  Lect. 3-4-(5) Optical Amplifier 2003. 5. 19 (Mon.)

  6.  Lect. 3-4-(6) Optical Amplifier 2003. 5. 19 (Mon.) ● SOA (Semiconductor Optical Amplifier) Electrical pumping by PN junction → Forward bias → Population Inversion → 빛 방출 → LED (Light Emitting Diode) → SOA Recall) Population Inversion 조건 At Semiconductor,

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