Fiber Optic Glossary : Q


  • Q Factor
    The Q factor (quality factor) of a resonator is a measure for the strength of the damping of its oscillations,...
  • Q Switched Lasers
    Lasers which emit optical pulses, relying on the method of Q switching
  • Q Switching
    A method for obtaining energetic pulses from lasers by modulating the intracavity losses.
  • QDST
    Abbreviation for quaternary dispersion supported transmission.
  • Quadrature Amplitude Modulation
    A coding technique that uses many discrete digital levels to transmit data with minimum bandwidth. QAM256 uses 256 discrete levels...
  • Quadrature Phase shift Keying
    Phase-shift keying uses four different phase angles out of phase by 90 degrees. Also called quadriphase or quaternary phase-shift...
  • Quadruply Clad Fiber
    A single mode optical fiber with four claddings. The refractive index of each cladding is lower than the core. With...
  • Quality of Service
    1. The performance specification of a communications channel or system which may be quantitatively indicated by channel or system performance...
  • Quantization
    The process of converting the voltage level of a signal into digital data before or after the signal has been...
  • Quantizing Error
    Inaccuracies in the digital representation of an analog signal. These errors occur because of limitations in the resolution of the...
  • Quantizing Noise
    Noise which results from the quantization process. In serial digital video, a granular type of noise that occurs only in...
  • Quantum Efficiency
    In a photodiode, the ratio of primary carriers (electron-hole pairs) created to incident photons. A quantum efficiency of 70% means 7...
  • Quantum Optics
    The science concerned with the applications of the quantum theory of optics; i.e., optics defined in terms of the quanta...
  • Quartz
    A very hard mineral composed of silica, SiO2, found worldwide in many different types of rocks, including sandstone and granite....
  • Quasi Continuous Wave Laser Diode
    A type of laser diode that operates at long pulsewidths.
  • Quasi CW Laser
    A laser that generates a succession of pulses at a high enough repetition rate to appear continuous. The pump source...
  • Quaternary
    A semiconductor compound made of four elements.
  • Quaternary Signal
    A digital signal having four significant conditions.

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