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Photon counting type communication receiving device with photon number resolution

A photon counting and communication receiving technology, applied in the field of low-light communication, can solve the problem that the bit error rate cannot be further reduced, and achieve the effect of reducing the bit error rate, reducing the bit error rate, and high sensitivity

Active Publication Date: 2017-07-14
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

With increasing background noise and increasing signal light, n t_best At this time, in order to further reduce the bit error rate, it is necessary to increase the threshold photon number of a single chip time. However, the traditional single photon counting receiving device can only distinguish a single photon. With the increase of the threshold photon number, the threshold photon number will increase. Approaching the maximum number of photons that a traditional single photon counting receiving system can respond to in a single chip time, in this case the bit error rate cannot be further reduced

Method used

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  • Photon counting type communication receiving device with photon number resolution
  • Photon counting type communication receiving device with photon number resolution
  • Photon counting type communication receiving device with photon number resolution

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Embodiment Construction

[0024] The photon counting type communication receiving device and receiving method with photon number resolution of the present invention will be further described in detail below with reference to specific examples and accompanying drawings.

[0025] see figure 1 , the device of the present invention comprises receiving lens 1 (model: N-BK7 LA1238 manufacturer: Thorlabs); Interference filter 2 (model: FL532-1 manufacturer: Thorlabs); Photomultiplier tube 3 (model: 9102B manufacturer: ET-enterprise ) with a dark current of 0.05nA and a gain of 5.6×10 6 ; Amplifier 4 (Model: AMC1200 Manufacturer: TexasInstrument), the input voltage range is 0 ~ 250mV, the output is 3 ~ 5V adjustable; please refer to image 3, the multistage comparator 5 is made of three micro-power comparison chips (model: TLV1702 manufacturer: Texas Instrument), and the multi-photon counter 6 is formed of a field programmable logic gate array (model: XC6SLX16-2CSG324I manufacturer: Xilinx); solution The mod...

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Abstract

A photon counting type communication receiving device with a distinguishable photon number, which is composed of a receiving lens, an interference filter, a photomultiplier tube, an amplifier, a comparator, a photon counter, a demodulation decoder and a host computer in sequence. The described comparator is a multi-level comparator, which is composed of more than 2 micro-power consumption comparison chips in parallel, and each micro-power consumption comparison chip is respectively set with a comparison threshold value, and the described photon counter is a multi-photon counter. The traditional single-photon counting type communication device has the advantages of high response sensitivity to weak light, and can also significantly reduce the bit error rate and ensure the reliability of communication.

Description

technical field [0001] The invention relates to the technical field of weak light communication, in particular to a photon counting type communication receiving device and a receiving method with resolvable photon numbers. Background technique [0002] Due to the advantages of low energy loss, wide bandwidth and high security, free space optical communication system has become a research hotspot. When communicating under low-light conditions, the receiving end of the communication system often uses a single-photon counting receiving device, which has high detection sensitivity in low-light environments. [0003] In free-space optical communication, the signal light and the background light both obey the Poisson probability distribution. According to the statistics of the background noise photon number n in a single chip time b The probability density of The sum of the number of background noise photons and the number of signal photons in a single chip time n s +n b The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/69
Inventor 周田华胡思奇陈卫标
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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