Bipolar self-balancing avalanche photo diode (APD) single photon detection system

A single-photon detection and bipolar technology, which is applied in the field of high-sensitivity and high-speed photoelectric detection, can solve the problems of difficult precise adjustment and control of signal delay and amplitude, increased post-pulse count and dark count, and unfavorable detection module performance. Achieve the effects of improving long-term stability, good dark count rate and after-pulse probability, and improving detection efficiency

Active Publication Date: 2013-03-20
广东华快光子科技有限公司
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Problems solved by technology

However, in the process of balancing, the delay and amplitude of the two signals of peak noise are not easy to be precisely adjusted and controlled, and the noise suppression is relatively low, about 15dB
In order to improve the signal-to-noise ratio, it is necessary to increase the amplitude of the avalanche signal, which can only increase the DC bias or the gate pulse signal, but at the same time, it will also increase the post-pulse count and dark count, which is not conducive to improving the performance of the entire detection module and is difficult to meet Practical application needs

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  • Bipolar self-balancing avalanche photo diode (APD) single photon detection system
  • Bipolar self-balancing avalanche photo diode (APD) single photon detection system
  • Bipolar self-balancing avalanche photo diode (APD) single photon detection system

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Embodiment Construction

[0030] A further detailed description will be made below in conjunction with the accompanying drawings and embodiments of the present invention:

[0031] Such as figure 1 As shown, the bipolar self-balancing APD single-photon detection system is characterized in that it includes an avalanche photocell circuit 1 for sensing external extremely weak light, and two ends of the avalanche photocell circuit 1 are connected in parallel to provide positive and negative bipolar The positive and negative bipolar bias generation circuit 2 of high bias voltage and the bipolar gate pulse generation circuit 3 for providing bipolar gate pulse, the output terminal of the avalanche photocell circuit 1 is sequentially connected with the A transmission line transformer circuit 4, a self-differential noise cancellation circuit 5 for eliminating signal capacitive noise, a broadband amplifier circuit 6 for signal amplification, and a high-speed comparator circuit 7 for avalanche discrimination.

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Abstract

The invention discloses a bipolar self-balancing avalanche photo diode (APD) single photon detection system which is characterized by comprising an avalanche phototube circuit, a positive and negative bipolar bias voltage generation circuit, a bipolar gate pulse generation circuit, a transmission-line transformer, a self-difference noise removing circuit, a wide-band amplifier circuit and a high-speed comparator circuit. The bipolar self-balancing APD single photon detection system aims at exciting an avalanche photo diode by adopting bipolar gate pulse and matching with bipolar direct current bias voltage, positive avalanche signals and negative avalanche signals are detected, positive and negative gate pulse bias voltage is equivalent to monopole bias voltage which is the sum of two gate pulse absolute amplitude additionally arranged on the APD, the detection system is favorable for exciting single photon avalanche at low direct current bias voltage and high gate pulse amplitude, influences of dark count and rear pulse are reduced, and detection efficiency and working frequency of a single photon detector are improved.

Description

[technical field] [0001] The invention relates to high-sensitivity and high-speed photoelectric detection, in particular to a bipolar self-balancing APD single-photon detection system. [Background technique] [0002] Single-photon detection technology is one of many technologies for ultra-sensitive optical signal detection. It has a very wide range of applications in physics, chemistry, biology and other disciplines and engineering applications, especially in quantum secure communication. As a key technology in the quantum security communication system, it is to realize single photon detection in the three low-loss windows of optical fiber communication, namely 850nm, 1310nm and 1550nm. In these three windows of communication, the energy of a single photon is on the order of 10E-19 joules, reaching the limit of the detection sensitivity of the detector. While continuing to develop and develop photodetectors with new structures with higher sensitivity, research has discovere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J11/00
Inventor 梁崇智曾和平梁焰
Owner 广东华快光子科技有限公司
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