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15 Photodetectors - Introduction, Photoconductors

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A photodetector is an optoelectronic device that absorbs optical energy and converts it to electrical energy, which usually manifests as a photocurrent. Photodetectors are widely used in optical communicati on systems. In this application, detectors receive the transmitted optical pulses and convert them, with as little loss as possible, into electronic pulses that can be used by a telephone, a computer, or other terminal at the receiving end. The performance requirements from the detector are high sensitivity, low noise, wide bandwidth, high reliability, and low cost. Phot odetectors - Introduction (Ch. 8) Light emitter (LED or Laser) Photodetector Optical link (fiber or open air)

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