Optomechanical Coupling Behaviors And Control Mechanism Of All Optical Switches Based On The Straight And The Ring Waveguides

At present,with the current computing power of the chips having more and more difficulty to meet the needs of various high-performance computing and the global Internet facing the increase of the throughput pressure of high-speed network,people urgently need a more efficient way of information transmission.Super large scale integrated(SLSI)optical circuit may cooperate with or even replace SLSI circuit to become an important part of the next generation of high-performance computing and high-speed communication networks.Optical microring resonators have become the most competitive integrated optical basic components due to their power enhancement,compact structure and good ability of wavelength selection.Based on microring resonator,various all-optical switches applying electro-optic effect,thermo-optic effect and electrostatic driving effect have been formed.In addition,the optical gradient force coming from the evanescent field of waveguide brings new driving means to all-optical switches.The main research work of this paper is the detailed theoretical analysis of two kinds of optical switches driven by optical gradient forces.Based on the optical switches,the logic optical switch which can meet the requirements of different logic gates is designed,and its theoretical feasibility is verified.The details are as follows:For all-optical switch based on the straight waveguide,the transverse deformation caused by the optical gradient force on the signal optical waveguide is studied based on Euler–Bernoulli beam theory,and the instantaneous pull-in optical power under specific structure is obtained.It is proved that the change of the waveguides' gap caused by optical gradient force will change the coupling coefficient of the waveguides at the same time,which makes the continuous power exchange unstable,then the output of the light intensity of the output ports is completely switched after that the control optical is input to realize the switching of the optical switch.Then,the influence of the bend waveguides on the optical switch is analyzed.For the all-optical switch based on the microring resonator,the enhancement effect of microring on optical gradient force is analyzed.Based on Timoshenko curved beam theory,the transverse deformation of microring caused by the optical gradient forces is obtained by Galerkin method,and its instantaneous pull-in phenomenon is studied.By analyzing the effective refractive index change caused by the change of the gap between the suspended part of the microring and the substrate,the deviation of the resonant light wavelength is obtained.The deviation of the resonant wavelength is the fundamental reason that the signal light is coupled into the microring and then output from another signal waveguide.Finally,the light intensity transmittance of each port of the optical logic switch based on the all-optical switch of microring resonator is analyzed by the coupling mode theory.The logic optical switch can meet the logical gate operations' requirements of "AND","NOT","OR","NOR","XOR" and "XNOR".The correctness of the optical logic switch is verified by theoretical analysis and simulation.