P. Ferro et al., PHASE-CONTROL OF A NONLINEAR COHERENT COUPLER - THE MULTI-BEAT-LENGTHTWISTED BIREFRINGENT FIBER, Applied physics letters, 64(21), 1994, pp. 2782-2784
We demonstrate that the switching power in a multi-beat-length and mis
matched nonlinear coherent coupler may be controlled by means of a sma
ll variation of the relative phase of two equally intense input beams.