Design Of Silicon-based Micro-ring Chip And Research On Its Transmission Characteristics

With the development of micro-nano photonic integration technology, the field of silicon-based micro-ring chip functional devices has become attractive. Several issues related to silicon-based micro-rings have been discussed in the paper, including the design and simulation verification of optical switches, design of polarization independent silicon-based optical switches, and the nonlinear transmission of light in micro-ring chip. The main content is listed as follows:1. A design method of silicon-based micro-ring chip is summarized, including the following steps:(1) to determine function principle and general scheme of the micro-ring chip,(2) to design transverse dimensions of optical waveguide,(3) to calculate the structure parameters,(4) to confirm coupling gap between micro-ring and straight waveguide,(5) to design the control electrodes,(6) to build the simulation model according to the parameters and(7) to readjust the relevant parameters and design the layout. Each of the procedures is investigated in the paper.2. In order to improve the quality of transmission spectrum in micro-ring switch chip, passband flatness, and roll-off degree, the cascaded micro-ring array has been adopted. Series and parallel structures can be used to eliminate crosstalk and realize the box spectrum, respectively. A detailed design process of the optical switch unit consisting of 3×2 micro-ring array is presented and the key parameters are obtained by simulation as follows: the 3d B bandwidth is 0.6nm, the extinction ration is larger than 20 d B, and the passband ripple is less than 0.012 d B with the shape factor of 0.9356.3. By analyzing the transmission characteristic in silicon-based micro-ring resonator, a design method of micro-ring resonator(MRR)-based optical switches capable of simultaneously providing the transmission of TE and TM modes is presented by optimizing the parameters of silicon-on-insulator waveguide. The resulting MRR-based optical switching chip has a very low polarization dependent loss of 0.13 d B. Our simulation also shows that the variation of the MRR’s length should be smaller than about 5nm for the PDL of 1d B.4. An all-optical regenerator based on four-wave mixing is designed, the idler light which generate from the nonlinear effect in the all-pass ring resonator is filtered out by the subsequent micro-ring. The power transfer function of the chip is simulated for improving the performance of signals by suppressing the mark jitter. The feasibility of the multi-wavelength regeneration scheme along with the demultiplex function is also shown by our simulation, and the layout design and fabrication have been accomplished.