Research On Optoelectronic Hybrid Integration Technology For High-Speed Broadband Optical Modules

Due to the vigorous development of new information technologies such as cloud computing,the Internet of Things,and big data,the amount of data in optical communication systems will also grow rapidly.The highspeed optical module is one of the core devices supporting the optical communication network system.With the increasing market demand,optical devices will rapidly develop towards high efficiency,small size,high integration,low power consumption,and low cost.In order to achieve the above goals,the new generation of optical module not only needs highperformance laser and detector chips,but also has high requirements for the optical and electrical integration technology inside the module.In this paper,the internal optoelectronic integration technology of a four channel high-speed optical module is studied,and the optical electrical optical full link design and optimization are carried out.The main innovations and achievements are summarized as follows:(1)In order to solve the problem of mode field mismatch caused by the mismatch between the size of the light spot emitted by the electroabsorption modulation laser and the size of the array waveguide grating waveguide in the optical transmission link,a mode spot converter based on nonlinear structure was designed,which improved the coupling efficiency of the laser and the array waveguide grating waveguide to more than 89%,reduced the Coupling loss of the optical transmission link,and at the same time,the size of the device was only 45%of the size of the traditional inverted cone mode spot converter.(2)In order to solve the problem of mode field mismatch caused by the size mismatch between the waveguide detector and the arrayed waveguide grating waveguide in the optical receiving link,a mode spot converter based on the double stepped structure was designed,which improved the coupling efficiency of the detector and the arrayed waveguide grating to 93%,reduced the Coupling loss of the optical receiving link,shortened the size of the mode spot converter,and effectively improved the device integration.(3)Modeling and optimizing the microwave link inside the optical module.The corresponding models were established in HFSS for the highspeed substrate of the electroabsorption modulated laser inside the optical module and the transmission line of the photodetector electrode,and the key parameters were optimized to reduce the high-frequency loss of the microwave link,improve the 3dB bandwidth of the high-speed substrate of the electro-absorption modulated laser to 55GHz,and reduce the insertion loss of the microwave transmission line to 0.39dB at 0-45GHz.