Which of the following is NOT a light source used with LAN or WAN fiber cable?

  • LED
  • VCSEL
  • GSM (Correct)
  • FP lasers

There are basically two categories of light sources used with fiber optic networking equipment—LED (light emitting diode) and laser. LED Within these two broad categories, there are several specific types of emitters, such as:

  • Surface-emitting LED
  • Edge-emitting LED
  • FP laser (Fabry Perot laser)
  • DFB laser (distributed feedback laser)
  • VCSEL (vertical cavity surface emitting laser)