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High-speed photodetectors.

L K Anderson1, B J McMurtry

  • 1Bell Telephone Laboratories, Inc., Murray Hill, NJ, USA.

Applied Optics
|January 9, 2010
PubMed
Summary
This summary is machine-generated.

This report reviews high-speed optical detectors for visible and near-infrared light. It focuses on devices with internal current gain, like vacuum tubes and p-n junctions, for detecting microwave-modulated signals.

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Area of Science:

  • Optoelectronics
  • Photonics
  • Microwave Engineering

Background:

  • High-speed optical detection is crucial for modern communication systems.
  • Detectors must efficiently capture weak optical signals modulated at microwave frequencies.
  • Existing technologies include vacuum and solid-state devices.

Purpose of the Study:

  • To provide a status report on high-speed detectors for the visible and near-infrared spectrum.
  • To emphasize detectors suitable for direct, noncoherent detection of microwave-modulated optical signals.
  • To summarize the properties and limitations of key gain mechanisms.

Main Methods:

  • Review of vacuum tube devices utilizing secondary emission multiplication.
  • Analysis of solid-state devices employing avalanche multiplication in p-n junctions.
  • Comparison of detector performance for high-frequency signal detection.

Main Results:

  • Both vacuum and solid-state detectors are viable for high-speed applications.
  • Internal current gain is a critical feature for detecting weak signals.
  • Secondary emission and avalanche multiplication offer distinct advantages and limitations.

Conclusions:

  • High-speed optical detection relies on devices with internal gain mechanisms.
  • Vacuum tube and solid-state technologies present different trade-offs for specific applications.
  • Further development is needed to optimize detectors for microwave-frequency optical signal detection.