Research And Design Of Underwater High-definition Video Optical Transceiver

Tremendous energy and resources of the oceans are extremely important for human survival and development, countries around the world has increased the exploration and development of marine resources. Among them, the underwater video monitoring system has played an important role. For lack of underwater high-definition video monitoring capabilities in our country, this article developed a kind of underwater high-definition video Optical transceiver based on HD-SDI. Although HD-SDI technology is already quite mature in the field of security monitoring, but few in the field of underwater video monitoring application. This solution has lower delay, good real-time performance, high security, etc. In addition, a large number of analog video monitoring systems can upgrade to high-definition video monitoring systems smoothly without rewiring, which can greatly save the cost.The main works of this thesis are: the design of system solutions, system hardware design, FPGA logic design and system debugging.Firstly, this thesis introduces the related technical principles, including the uncompressed digital high-definition technology, optical fiber communication technology and GTP transceiver technology. Among them, the GTP transceiver design is one of the key points and difficulties of this article. When designing a GTP transceiver, those challenges include understanding the transceiver protocols, signal integrity, impedance and power requirements, printed circuit board design requirements, etc.Secondly, this thesis designs and implements a kind of underwater high-definition video optical transceiver based on HD-SDI. The system uses the GTP transceiver of Xilinx FPGA to achieve a series of data processing and conversion. Comparing with employing discrete serdes chips, it not only gets rid of the SSO problems, also greatly reduces the size of the PCB. The system includes an underwater fiber-optic communication system and deck fiber-optic communication system, the underwater fiber-optic communication system mainly complete the collection of high-definition video data and sensor data from the various interfaces and photoelectric signal conversion, the deck fiber-optic communication system is just the opposite. The hardware design mainly includes the selection of FPGA and configuration circuit, HD-SDI video input/output circuit, RS232/485/422 circuit, SFP optical module circuit, clock circuit and power supply design.Thirdly, this thesis introduces the FPGA logic design project, including HD-SDI video input/output module, clock and reset module, asynchronous FIFO, RS232, RS485 and RS422 communication module, and Aurora core, etc.Finally, the thesis describes the process of debugging of the whole system, including the hardware debugging of the whole system, the communication link testing, the communication link bit error rate testing and the final system testing.Test results show that the various parameters basically met the design target.