Study On Integration And Stability Of Mode-Locked Kerr Optical Comb System

The capacity of fiber transmission network is developing towards Terabit or even Petabit,with the sustained,rapid growth of all kinds of communication services.One of the key technologies supporting this march is the novel light source which suites to large capacity optical transmission system.The newly invented microcavity-based Kerr optical comb has the unique advantages of high performance and chip-scale integratable,which shows its prominent potential to become the next generation light source.However,to become an ideal light source with integration,low cost,low power consumption,high frequency stability,low phase noise,phase coherence between multiple carriers,and mutual lock between the carrier and the local oscillator,there are still many problems in Kerr optical comb about generation mechanism,key performance,application methods,and further research about Kerr optical comb is urgently needed.Among them,on-chip integration is an inevitable trend of new optical communication devices.Therefore,how to achieve high-Q silicon nitride chip packaging with low loss is very important,which can not only improve the stability of the new coherent light source,but also make Kerr optical comb's requirements for pump laser power continue to drop.This means that using a common laser to directly pump the microcavity to generate Kerr optical comb,and cancelling the amplification of the pump laser by EDFA,will be realized in the short term.This also laid the foundation for the miniaturization of Kerr optical comb light sources.The research in this thesis is mainly based on the packaging of arrayed waveguide devices,exploring the integration of the mode-locked Kerr optical comb,improving the stability of Kerr optical comb,studying multi-channellaser light sources for next generation DCI interconnections.The main research contents of this thesis are as follows:1.Si3N4-chip packaging.Based on the feature of silicon nitride waveguide,the key technology of coupling waveguide device and integrated waveguide device on chip is researched,and an economical,easy-to-operate,and highly successful Si3N4-chip packaging scheme is proposed.The Si3N4-chip has been achieved successfully.2.Design and assembly of mold clamping Kerr optical comb prototype.Based on the generation of microcavity optical solitons assisted by laser heating,a new mode-locked Kerr optical comb prototype was proposed.The program system of the prototype was designed,and the assembly of the first domestic prototype was successfully achieved.3.The stability and prototype performance test of Kerr optical comb.We analyze the stability of Kerr optical comb from multiple aspects.The comparison between the optical comb produced by the experiment and the optical comb produced by the prototype shows the huge improvement of the stability of the Kerr optical comb produced by the prototype.The performance of the Kerr optical comb prototype matching system has been tested and optimized.