Research On On-Chip Multi-Wavelength Routed Optical Interconnection Networks Based On Inverse Design

With the continuous development of the times,the rapid development of communication technology also brings various challenges in the era of big data.The integrated optical system can greatly reduce the manufacturing cost of the device,improve the information transmission capability,and can be widely used in on-chip optical interconnection.The optical interconnection on the chip is based on the integration technology of micro-nano photonic devices,so it is very important for the research and design of key devices.In the pursuit of high inte-gration of photonic chips,a new inverse design method is proposed,which over-comes the disadvantages of manual parameter tuning and large device size.Through the optimization algorithm to realize the inverse design,the designed device is not only small in size and low in loss,but also can realize various func-tions.This thesis is based on the knowledge of key devices for on-chip optical in-terconnection networks and uses the inverse design approach to investigate the design of the devices.The performance improvement of individual devices and their applications are first discussed,and then how the cascaded devices can im-prove performance by improving the optimization algorithm is investigated.Fi-nally,an on-chip multi-wavelength routing optical interconnection network is de-signed.The main elements of the study include:（1）Firstly,using the direct binary search algorithm,three arbitrary 1×3power splitters are designed,which have arbitrary output directions and can be connected to other devices in any direction.They can greatly reduce the space occupied by photonic integrated circuits.It also discusses the impact of memory usage on device performance.Through the design results,three 1×3 power split-ters can be freely combined to achieve any direction,multi-channel,ultra-compact power splitter,and can be better connected with different devices to achieve dif-ferent functions.Also,a combined 1×6 power splitter is shown.（2）A wavelength demultiplexer with a size of only 3.6μm×2.4μm is de-signed based on a direct binary search algorithm.In addition,a waveguide cross-ing also is designed,and the occupied area of the designed structure is 3.6μm×2.4μm.Then,an optical interconnect structure is designed using the proposed wavelength demultiplexer and waveguide crossing,which can serve as a basic optical cross-connect structure.Compared with conventional optical intercon-nects,the integration density and gain applied to on-chip optical systems have been greatly improved.During the optimization process,the performance of the device is improved by adjusting the weight of the FOM and discussing the struc-tural parameters.Through the integration of devices,insertion loss and crosstalk can be reduced,laying the foundation for the realization of any wavelength rout-ing optical interconnection network.（3）Firstly,an optical interconnection network based on optical filter and wavelength crossing is proposed.This structure can support wavelength routing of four wavelengths of 1300 nm,1400 nm,1500 nm,and 1600 nm in TE₀ mode.Among them,the footprint of a single structure is only 3.8×2.6μm.Finally,the footprint of the entire network is only 12.84×6.8μm,which will significantly increment the integration density and encourage different on-chip optical commu-nication systems.At the same time,the experimental preparation of the device was carried out to verify its manufacturability of the device.In addition,by cas-cading the designed basic devices and the optical interconnection network,a com-plete on-chip multi-wavelength routing optical interconnection network can be formed.The integrated network supports both routings of multiple wavelengths and the splitting of power.And it has a smaller size and better performance,which lays the foundation for the on-chip photonic integrated chip.