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Optical Sources for Fibers

Optical Sources for Fibers

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Radio systems require electromagnetic energy sources in the frequency range of 1 MHz to 40 GHz, which must be coherent and stable in amplitude (Chapter 1). Recall that the spectrum of coherent sources appears as a single frequency with very little accompanying noise modulation. The spectrum of a noncoherent source is a band of noise, sometimes confined but usually quite broad. Because of their coherence and stability, RF sources can transmit signals through the modulation of their amplitude, phase or frequency. They also provide coherent and stable signals at receivers for subsequent demodulation.

Chapter Contents:

  • 4.1 Introduction
  • 4.2 Optical Semiconductors
  • 4.3 Light-Emitting Diodes
  • 4.3.1 LED Construction
  • 4.3.2 LED Modulation Bandwidth
  • 4.3.3 LED Power Output and Modulation
  • 4.3.4 LED Spectral Emission and Coherence
  • 4.3.5 LED Coupling to Fibers
  • 4.3.6 LED Packaging and Reliability
  • 4.4 Semiconductor Lasers
  • 4.4.1 ILD Construction
  • 4.4.2 ILD Modulation Bandwidth
  • 4.4.3 ILD Power Output and Modulation
  • 4.4.4 ILD Spectral Emission and Coherence
  • 4.4.5 ILD Coupling to Fibers
  • 4.4.6 ILD Packaging and Reliability
  • 4.4.7 Vertical Cavity Surface Emitting Lasers (VCSEL)
  • 4.5 Optical Source Coherence
  • 4.6 Erbium-Doped Optical Amplifiers (EDFA)

Inspec keywords: optical modulation; demodulation; optical receivers; light sources; light coherence; optical noise

Other keywords: noise modulation; coherent sources spectrum; optical source; electromagnetic energy source; receiver; radio system; demodulation; optical fiber; RF source; frequency 1 MHz to 40 GHz

Subjects: Optical communication equipment; Modulation and coding methods; Optical fibre networks

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