In fiber optic communication systems, noisy variation in this quantity occurs due to the Gordon-Mollenauer (moh-len-"ow"-er) effect.
In fiber optic communication systems, noisy variation in this quantity occurs due to the Gordon-Mollenauer (moh-len-"ow"-er) effect. Bohm and Pines developed an approximation named for this quantity in which single-particle degrees of freedom interact via a short-range screened Coulomb force, leading to the Lindhard formula for the permittivity of an electron gas. One form of this quantity includes a factor of "one plus n plus m" for the T·E·M-sub-n-m mode of a Gaussian beam and is named for Gouy ("gooey"). Another form of this quantity belongs to the holonomy group of a Hermitian line bundle and arises when at least two Hamiltonian parameters of a system undergo adiabatic transport along a closed loop, as shown by Michael Berry. The quotient of angular frequency and wavenumber is this quantity's namesake velocity. For 10 points, name this quantity that may di fer for two light waves by up to 360 degrees.
In fiber optic communication systems, noisy variation in this quantity occurs due to the Gordon-Mollenauer (moh-len-"ow"-er) effect.
phase shift [accept Gordon-Mollenauer phase noise or random phase approximation or Gouy phase or geometric phase or Pancharatnam-Berry phase or phase velocity]