In Fiber optics, for a given mode propagating in a medium of Refractive Index , the velocity of Light in vacuum, c, divided by the Group Velocity of the mode.
Note: For a plane Wave of wavelength, the group index may also be expressed as shown above, where n is the phase index of wavelength.
Absolute Refractive Index, Absorption Index, Effective Refractive Index, Graded Index Fiber, Graded Index GI, Graded Index Profile, Graded-Index, Group Delay, Group Index, Group Velocity,
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