Fiber Optic Glossary


  • Gain
    Also known as amplification. (1) The increase in a signal that is transmitted from one point to another through an amplifier....
  • Gap Loss
    The power loss that occurs when an optical signal is transferred from one fiber to another that is axially aligned...
  • Gap Loss Attenuator
    An optical attenuator that exploits the principle of gap loss to reduce the optical power level when inserted in-line in...
  • Gateway
    Relay at any layer above the network layer.
  • Gaussian Beam
    A beam pattern used to approximate the distribution of energy in a fiber core. It can also be used to...
  • Gaussian Curve
    The “normal curve,” or normal distribution, an example of which is the symmetrical bell shape of the holes created by the...
  • GBE
    An abbreviation for Gigabit Ethernet.
  • GBPS
    Giga Bits Per Second = 1 Billion Bits Per Second.
  • GBS
    An abbreviation for gigabits per second.
  • Gel
    A substance, resembling petroleum jelly in viscosity, that surrounds a fiber, or multiple fibers, enclosed in a loose buffer...
  • GHz
    An abbreviation for gigahertz.
  • Gigabit Ethernet
    Gigabit networking, or commonly called 10-Gigabit Ethernet (10GBASE-T), is a communications technology that offers data speeds up to 10 billion...
  • Glass
    In fiber-optic communication, any of a number of noncrystalline, amorphous inorganic substances, formed, by heating, from metallic or semiconductor oxides...
  • GPIB
    An abbreviation for general-purpose interface bus.
  • GPS
    An abbreviation for global positioning system.
  • Graded Index Fiber
    An optical fiber with a core having a refractive index that decreases with increasing radial distance from the fiber axis....
  • Graded Index GI
    Descriptive of an optical fiber having a core refractive index that decreases almost parabolically and radially outward toward the cladding....
  • Graded Index Profile
    Any refractive index profile that varies with radius in the core.
  • Graded-Index
    Fiber design in which the refractive index of the core is lower toward the outside of the fiber core and...
  • Gradual Failure
    A failure in which the device characteristics change slowly, anywhere from hours to years.
  • Gradual Fiber
    A failure in which the device characteristics change slowly, anywhere from hours to years.
  • Grommet
    A resilient elastomeric seal bonded to the rear of a connector. It is designed with internal sealing barriers that grasp...
  • Ground Loop Noise
    Noise that results when equipment is grounded at ground points having different potentials and thereby created an unintended current path. The...
  • Grounding fingers
    Grounding spring – a metal band with spring fingers attached to the plug shell to ensure positive shell-to-shell grounding before...
  • Group Delay
    The rate of change of the total phase shift with respect to angular frequency, d /d , through a device...
  • Group Index
    In fiber optics, for a given mode propagating in a medium of refractive index , the velocity of light in...
  • Group Velocity
    The velocity of propagation of an envelope produced when an electromagnetic wave is modulated by, or mixed with, other waves...
  • Guided Mode
    In an optical waveguide, a mode whose field decays monotonically in the transverse direction everywhere external to the core and which...
  • Guided Ray
    In an optical fiber, a ray that is confined primarily to the core.

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