Research And Implementation Of Optical Route Integration Devices Of Elastic Optical Networks Based On Inverse Design And Algorithms

According to the demand of the service,elastic optical networks can flexibly and dynamically allocate bandwidth,which effectively improves the utilization of spectrum resources.In the elastic optical interconnection networks,it must involve the continuous change of optical path: the change of directions of the same optical path,the crossover and connection of different optical paths.Therefore,optical route devices are the essential basic devices in the elastic optical interconnection networks.The research and design of these devices is very important for the construction of the elastic optical networks.With the improvement of Nanotechnology manufacturing level,the research and design of optical devices begin to develop towards ultra-compact miniaturization,and optical devices integrate with nano-electronic devices to achieve ultra-high integration of optical chips.In order to overcome the limitation of the traditional method of designing optical devices by adjusting the physical parameters according to the optical analytic theory,the inverse design method is proposed.At the same time,combining this idea with the optimization algorithms,the possibility of diversities of designing optical device is greatly improved.In this paper,according to the study of the key optical devices that enabled elastic optical networks to flexibly and dynamically allocate bandwidth,the micro-nano optical route devices which can realize the reverse change,conversion and cross connection of optical path are studied and designed on chip by combining the inverse design idea and optimization algorithms.The main contents of this paper include:(1)The research and background of this paper are introduced.The research of optical route devices,inverse design and optimization algorithms is summarized.The theoretical knowledge of inverse design,optimization algorithms,and the advantages and realization process of designing micro-nano optical route devices with algorithms are studied.(2)A genetic algorithm applied in the research of micro-nano optical devices is proposed.It overcomes the drawbacks of manual regulation of physical parameters.Using this algorithm,a reflector with a footprint of only 1.8?m × 1.8?m that can achieve ?94% reflectivity is designed on silicon-on-insulator platform.Another reflector achieving 84% reflectivity and used in water is also designed.Meanwhile,the optical route device with different input and output ports is designed using the same algorithm.Its size is only 2.4?m × 2.4?m and it can realize 80% transmission efficiency.In elastic optical networks,these devices can load different band of optical sources according to the demand of services.The reverse change of optical path is realized by using them.These devices are widely used in attenuators,filters and laser cavities(3)A specific direct binary search algorithm with faster convergence is proposed.We designed three structure by using this algorithm.A waveguide bend structure with a footprint of only a 2.4?m × 2.4?m is designed,which can realize 90° turns of optical route and whose transmission efficiency up to 96%.A "+" waveguide cross structure with a footprint of only 2.4?m × 2.4?m is designed,which can provide a insertion loss of greater than-0.5d B and crosstalk of lower than-19 d B.A same direction waveguide cross structure with a footprint of only 2.4?m × 3.6?m is desinged,which can provide a insertion loss of greater than-0.56 d B and crosstalk of lower than-21 d B.In the elastic optical interconnection networks,these devices are widely used in a variety of optical transmission path selection changes,cross connections and overlaps.The acting wavelength of these devices can be determined by the services of elastic optical networks operation situation.Several super-compact base optical interconnection structures have been designed by using this structures.They all achieve high transmission efficiency.