Research On The Characteristics Of Microring Devices Based On Magneto Optical Phase Shift

The development of silicon photonics has stimulated the research of silicon-based optical waveguide devices and the design of multi-functional optical signal processing chips as well as optical communication devices.The research of magneto-optical siliconbased waveguide devices?such as magneto-optical isolators?is a hot topic in large-scale integrated chip.Based on the principle of magneto-optical phase shift,this paper mainly studies the application of magneto-optical silicon-based waveguide structure in microring device,analyzes the magnetic field sensing properties of magneto-optical micro-ring resonator and the magneto-optical switching characteristics of magneto-optical Sagnac micro-ring structure.The main contents and innovations of this paper are listed as follows:1.The effects of magneto-optical effect on the propagation characteristics of the guided wave are analyzed.The characteristics of the magneto-optical phase shift of twodimensional planar waveguides and three-dimensional rectangular waveguides are studied between magnetization of emphatically and horizontally.The effect of magnetization on the distribution of waveguide and its propagation constants in the two kinds magneto-optical waveguides of Ce: YIG/Si/SiO₂ and SiO₂/SiCe:YIG/SiO₂ were analyzed by COMSOL simulation software.The results show that the magneto-optical phase shift can be obtained in the two kinds of waveguide structures when the interface of Ce:YIG/Si waveguide is same as the direction of magnetization,their corresponding wave modes are TM wave and TE wave respectively.2.The silicon-based micro-ring resonator?MRR?composed of the MO waveguide of SiO₂/Si-Ce:YIG/SiO₂ is designed for magnetic field measurement.The resonant wavelength shift varying with normal magnetization for the quasi-TE mode in the MOMRR waveguide is simulated.For the MO-MRR with the radius of 20?m,the magnetic field measurement sensitivity can be achieved to be 0.0054nm/?kA/m?by optimizing the waveguide width and the resonant wavelength shift is up to 0.52 nm for saturated magnetization.3.A kind of Sagnac micro-ring resonant magneto-optical switching device based on Ce:YIG/Si/SiO₂ waveguide structure is proposed.the light opening function of the 0.96 nm bandwidth signal can be realized under the microring length of 100 ?m and the switching magnetization of 53.82kA/m?lower than the saturation magnetization?.compared with the Sagnac magneto-optical switch based on the direct waveguide,the device size and the switching magnetization can be greatly reduced;besides,it can reach a greater device bandwidth and switching extinction ratio performance than microring resonators optical switches which is based on wavelength-shifted.