COUPLED MODES

1. In fiber optics , a mode that shares energy among one or more other modes, all of which propagate together. ( 188 ) [After 2196 ] Note: The distribution of energy among the coupled modes changes with propagation distance. 2. In microwave transmission , a condition where energy is transferred from the fundamental mode to higher order modes. Note: Energy transferred to coupled modes is undesirable in usual microwave transmission in a waveguide .