Research On Transmission Characteristics Of Largecapacity Optical Switching Chips

With the development of the Internet of Things,cloud computing,and artificial intelligence,the data traffic of the Internet continues to increase,and the channel transmission capacity continues to increase.Due to the problems of electronic bottlenecks and excessive power consumption in the traditional optical-electrical-optical switching form,it is difficult to match the switching processing performance with the channel transmission capacity.Optical switch integrated chip technology is considered to an effective way to solve the above problems.This article analyzes the transmission performance of optical switching integrated chips by building simulation models of optical switching chips with different topologies,which is helpful for the development of large-capacity optical switching chips.The main innovations and work content of the thesis are as follows:1.A simulation method of large-capacity optical switch integrated chip is proposed,and its simulation model is composed of two parts: an optical switch control unit simulator and an optical switch integrated chip simulator.The optical switch control unit simulator is used to control the parameters and switch states of the optical switch chip unit;the optical switch integrated chip simulator is used to simulate the physical topology of the optical switch chip,which is formed by connecting the optical switch simulation unit and the waveguide cross point.Using the above simulation method,three types of optical switching chip simulation models of Benes,dilated Benes,and S&S are built to analyze the impact of chip insertion loss and crosstalk on the transmission performance of high-order modulation signals.2.The simulation compares the transmission performance of traditional Benes and dilated Benes optical switching chips in a 200Gb/s system.Studies have shown that,if the receiver sensitivity degradation does not exceed the limit of 1d B,the former's optical switch units should have a lower crosstalk than the latter's by 6d B.Specifically,under16QAM(or 64QAM)modulated signals,the maximum crosstalk allowed by their switch units are respectively-32.8d B(-41.5d B)and-24.6d B(-30 d B)for 16×16-scale optical switching chips,and-33.9d B(-48.3d B)and-27.8d B(-32 d B)for 32×32 counterparts.3.In the same transmission system,the transmission performance of 32×32 S&S optical switch chip was simulated and compared with the dilated Benes structure.Still taking the receiver sensitivity degradation of no more than 1d B as the limit,it is shown that,the crosstalk requirements of the switch units used in the S&S optical switching structure are,respectively,7.1d B and 7.94 d B for 16 QAM and 64 QAM signals,lower than those of the dilated Benes structure.In short,for the same scale of Benes,dilated Benes,and S&S optical switching chips,the S&S structure has the lowest crosstalk requirements for optical switch unit.