Modal Exciter
Equilibrium length is, strictly, the longest such length, as would be a consequence of a widely variable array of input of the modal exciter. Other terms for equilibrium length are equilibrium coupling length and equilibrium mode distribution length. The equilibrium mode [power] distribution of light travelling in a optical waveguide or fiber, is the distribution of light that is no longer changing with fibre length or with input modal excitation. This phenomenon requires both mode filtering and mode mixing to happen inside the fibre to make a state that is independent of the mode power distribution launched from the light source. At propagation distances exceeding the equilibrium length, intramodal pulse distortion increases (bandwidth decreases) as the square cause of length.
May 16th, 2012 by admin | Comments Off