lect21 - Thermal and Photon Detectors Introduction to...

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Thermal and Photon Detectors – Introduction to Photodetectors – Quantum Efficiency – Photon Detectors – Thermal Detectors – Noise Considerations
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Photodetectors Optical detection Process that converts optical signal to electrical signal Photodetector Too slow to follow instantaneous signal Square Law device: output proportional to optical power
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• Sensitivity – Needs to be sensitive to particular wavelength of light • Speed – Needs to have a fast enough response to follow modulation of the optical signal • Responsivity: electrical current to optical power Photodetectors: “Figures of Merit” quantum efficiency
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