Research Of Near Infrared Detector

Avalanche photodiode as a traditional detector for low light detection with high sensitivity, has been applied to the forefront of scientific research and engineering applications. In recent years, with the development of technology to raise the level of science and technology, the traditional single-photon detector performance requirements are constantly improving. Especially in quantum key distribution system for the rapid development of quantum information technology on behalf of, the traditional single-photon detectors can not meet the requirements. At this stage, single-photon detectors in precision analysis, biological, atmospheric, astronomy, space science, quantum information, and so has a very wide range of applications. Recently some scientists also used to detect single-photon detectors distributed optical fiber temperature sensor. To the demand for single-photon detectors in various fields, researchers at home and abroad are constantly improving the traditional single-photon detector, while also trying to explore more efficient single photon detection technologies.Firstly, this paper introduces the research background and development of single photon detector. Here the paper puts forward the design and characterization of a new InGaAs/InP single-photon detector with a hold-off time modulation feedback control circuit and gated mode at1550nm and shows the improvements. In addition, the use of delayed extraction avalanche signal identification and edge latched circuit can effectively suppress the spike pulse. Semiconductor cooling system based on Peltier effect can control the temperature of-65°C. The experimental tests of the single photon detector of the gate frequency of10MHz, cooling temperature is-65°C,when the gate pulse width is5ns by comparing different SNR offset voltage. When the incremental draw bias to the optimum operating point is1.8V, the quantum efficiency is about20.42%, dark count rate is5×10-6/ns and SNR is about27dB. For the experimental results, the relationship between incremental bias voltage and dark count rate and the quantum efficiency of avalanche diode as well as the effect of temperature on the performance of single-photon detectors each parameter have been discussed.Besides, particularly introduces serial communication programs in the software design part, which is programmed in Java and can assure the communication of single photon detection and computer.