Theoretical Study On Electrically Reconfigurable Silicon Waveguide Array

By applying different bias voltage on waveguide array,electrically reconfigurable waveguide array can change the characteristics of optical transmission.As a controllable optical interconnection device of on-chip optical system,electrically reconfigurable waveguide arrays have broad applications.We have proposed a kind of electrically reconfigurable waveguide array and theoretically studied how to change the characteristics of optical transmission by using different bias voltage.The main works are as follows:1.A scheme of electrically reconfigurable silicon waveguide array realized by using d.c.Kerr effect of silicon has been proposed.This waveguide array is etched on the crystal silicon with a light-doped p–i–n structure and every waveguide can be controlled by local bias voltage independently.The relatively large separation(2.2 um)between the waveguides leads to the weak coupling between lights in them.The characteristics of optical transmission can be described by mode coupling equation including Kerr effect and d.c.Kerr effect of silicon.2.Control the transmission of high power light by electrically reconfigurable waveguide array.Through a balance of discrete diffraction and nonlinearity of silicon,light in nonlinear waveguide array could form a non-diffracting discrete soliton(DS).When the bias voltage is zero,the discrete soliton can transmit along a straight line in the waveguide array.By applying the reverse Sech-function bias voltage,discrete soliton can be reflected,captured and split.3.Control the transmission of low power light by electrically reconfigurable waveguide array.By applying a Sech-function bias voltages on the waveguide array,a Kerr-type DS can be mimicked by a low-power incident light.The center position of the transmitted light can be flexibly altered by changing the isosceles-trapezoid bias voltage on the waveguide array,while the characteristics of the incident light are well preserved.The realized maximum spacing between the center of incident and transmitted light reaches the waist radius(20a)of transmitted light without bias voltages applied4.Bound states in the continuum(BIC)can be obtained and manipulated by electrically reconfigurable waveguide array.By applying designed bias voltage,the inhomogeneous waveguide array supporting Ablowitz-Ladik(AL)soliton-type BIC can behave like a homogeneous waveguide array and BIC can reappear in different position of this waveguide array.