Photon counting type communication receiving device capable of distinguishing photon numbers

Abstract

A photon counting type communication receiving device capable of distinguishing photon numbers is composed of a receiving lens, an interference filter, a photomultiplier, an amplifier, a comparator, a photon counter, a demodulation decoder and an upper computer in sequence. The photon counting type communication receiving device is characterized in that the comparator is a multilevel comparator composed by connecting two or more micro-power consumption comparison chips in parallel, each micro-power consumption comparison chip is set with a comparison threshold, and the photon counter is a multi-photon counter. The photon counting type communication receiving device has the advantage, also achieved by a traditional single-photon counting type communication device, of high weak light response sensitivity; the bit error rate can be reduced remarkably, and communication reliability is guaranteed.

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 a distinguishable photon number. Background technique [0002] Free-space optical communication systems have become a research hotspot due to their low energy loss, wide bandwidth, and high retention density. When communicating under weak light conditions, the receiving end of the communication system often adopts a single-photon counting type receiving device, which has high detection sensitivity in a weak light environment. [0003] In free space optical communication, both the signal light and the background light obey the Poisson probability distribution. According to the counted number of background noise photons in a single chip time n 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 +...

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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

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