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Unformatted text preview: IEG4030 Optical Communications Tutorial 3 Tutorial 3 Optical Transmitter A) Energy Bandgap: The gap between conduction and valence bands, which determines the conductivity of a material. z Direct Bandgap The conduction band minimum and Valence band maximum have the same momentum B) Doping Add impurity to intrinsic semiconductor to increase conductivity C) Three types of semiconductors Conduction Band Forbidden Band Valance Band E g: band gap Energy Level of Doners Energy Level of Acceptors n-doped Semiconductor p-doped Semiconductor Semiconductor Conduction Band Forbidden Band Valance Band E g: band gap Energy Level of Doners Energy Level of Doners Energy Level of Acceptors At room temperature Intrinsic n-doped Semiconductor p-doped Semiconductor Semiconductor 1/5 (Extrinsic) (Extrinsic) IEG4030 Optical Communications Tutorial 3 D) PN Junction z p-type and n-type semiconductors are jointed, holes and electrons recombine....
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- Spring '10
- Condensed matter physics, valence band, conduction band, Electronic band structure, Optical Communications