Research On Key Technologies Of 100g Ultra-high-speed Optical Transceiver Modules

Due to the current rapid growth of cloud computing and big data services,the requirements for broadband in data centers are constantly increasing.Among them,optical fiber communication is the main transmission method in the field of data communication,whether in terms of transmission time or transmission distance.As the key equipment in optical fiber communication,the optical transceiver module naturally requires continuous development and innovation to meet the growing big data transmission services.With the characteristics of small size and high integration density,the QSFP28(Quad Small Formfactor Pluggable28)packaging mode has become the mainstream 100 G optical transceiver module packaging method.The total data transmission rate of 100 Gps is achieved by connecting four single-channel 25 Gps in parallel.Among them,the light emitting sub-module completes the electrical-optical signal conversion function,and the light-receiving sub-module realizes the photoelectric signal conversion function.This paper firstly studies and analyzes the relevant theories and technologies in the field of optical transceiver modules,and designs an overall framework of QSFP28 optical transceiver modules,aiming at the four main hardware parts of the overall framework:electrical interface,transmitter,receiver and on-board vias.Made a detailed design.Among them,the electrical interface includes the definition of the electrical interface and the power supply design to ensure that the optical transceiver sub-module can communicate with the external circuit and ensure the safety of the circuit.For the transmitter,after determining the performance indicators,the optical transmitter submodule,multiplexer,semiconductor thermoelectric cooler,automatic power control and laser drive are designed to complete the conversion of electrical signals to optical signals.Features.Similarly,after defining the performance indicators of the receiving end,the three parts of the light receiving sub-module,the arrayed waveguide grating and the transimpedance amplifier are designed to realize the conversion of electrical signals to optical signals.In order to ensure the signal integrity in 100 Gbps high-speed transmission,a through-hole design is used for the signal line vias on the circuit board.After completing the above-mentioned hardware part design,the encapsulation mode of the transmitting end and the receiving end in the optical transceiver module is also specifically designed.Then,this paper simulates and implements the transmitter and receiver.Carry out optical path simulation according to the designed simulation scheme,analyze the simulation results and coupling efficiency,and verify the feasibility of the design scheme of the transmitter and receiver.After that,the transmitter and receiver were implemented in the laboratory,and the two were pasted on the designated position of the circuit board,and the QSFP28 optical transceiver integrated module was successfully produced.Finally,this paper tests the above-mentioned optical transceiver modules.After building the test platform and determining the test method,the debugged optical transceiver module is compared with three other optical transceiver modules of the same type at home and abroad.The test results show that the QSFP28 optical transceiver module integrated in the transmitting and receiving components designed in this paper,in the 20 km transmission process,no error code is generated,and the key performance indicators such as transmitting and receiving optical power,extinction ratio,eye diagram and sensitivity are all ahead of similar products at home and abroad,reaching the expected design goal.This optical module has been used in a company in Guangdong.Small batch production.