Research On Key Technology Of Long-distance And High-Efficiency Power-over-fiber

Since the country has built a well-off society in an all-round way,the construction of the Internet of Things has ushered in a new period of opportunity to promote the development of a smart society in the 14th Five-Year Plan,and has become one of the core driving forces for the development of the digital economy in the next decade.In the new plan,the "New Infrastructure" project puts forward new requirements for wide coverage,multiple parameters,and high precision for IoT sensing and monitoring facilities.However,traditional monitoring facilities in special scenarios that require electromagnetic isolation such as power transmission lines and underground pipe corridors are restricted by energy supply and communication means and cannot operate normally,which limits the application of the Internet of Things in these environments.In order to solve the energy supply and monitoring problems in the above-mentioned special scenarios,currently emerging solutions include optical fiber passive-support monitor and environmental self-supply technologies.Optical fiber passive-support monitor technology has the advantage of anti-electromagnetic interference,but the accuracy is not high and there are certain limitations on the monitoring parameters.The environmental self-supply method has certain requirements for natural and meteorological conditions while solving energy problems.There are uncontrollable defects.As an emerging energy supply technology,power-over-fiber technology has attracted attention in the power supply field because of its stable energy supply,anti-electromagnetic interference,strong insulation,and easy deployment.It is a potential power delivery method.Based on this,this paper has carried out research on the long-distance power-over-fiber with information co-fiber back transmission system scheme for the energy supply problems and communication needs of the Internet of Things sensing and monitoring facilities in special scenarios,ensuring the stable power supply of electronic sensors and the realization of Secure data transmission.The main research work and results completed in this paper are as follows:1.Propose a long-distance power-over-fiber scheme based on single-mode fiber.The plan conducts research on the principle and process of electrical-optical conversion,optical waveguide transmission and photoelectric conversion of power-over-fiber technology,and analyzes the optical fiber transmission loss according to the insufficient fiber transmission loss of traditional power-over-fiber scheme under long-distance conditions,and points out that it can be increased The linewidth of the light source combined with the use of mid-to-far infrared light reduces the loss of the laser in the long-distance transmission of the optical fiber,making the long-distance application of the power-over-fiber feasible.2.Developed a long-distance power-over-fiber with information co-fiber return system device.The device is based on a long-distance energy transmission scheme and uses WDM to achieve co-fiber transmission of energy flow and information flow.The system's laser emits an optical power of 500mW and a transmission distance of 10km.The photovoltaic cell can output 57mW of electrical power after conversion,and it has the ability to transmit optical signals at a maximum rate of 1G.3.The experiment verifies the actual usability of the long-distance power-over-fiber with information co-fiber backhaul system.The experimental system combines sensor monitoring nodes and system software platforms suitable for power-over-fiber with information co-fiber return devices,and realizes the charge and discharge balance of the energy storage power supply and the stable operation of the monitoring nodes,which proves the practical value of the system.