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Polarization demodulation and photon number resolving compatible detection device and method in laser communication

A laser communication and detection device technology, which is applied in the field of receiving and detecting, can solve problems such as high cost, lack of photon resolution capability, and difficulty in obtaining area array single photon detectors, and achieve the effect of suppressing background noise and improving transmission capacity

Pending Publication Date: 2018-05-08
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the unit-type Geiger mode single-photon detector has good performance and mature technology, but it does not have photon resolution capability, while the area-array single-photon detector with photon resolution capability is difficult to obtain and the cost is high.

Method used

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  • Polarization demodulation and photon number resolving compatible detection device and method in laser communication
  • Polarization demodulation and photon number resolving compatible detection device and method in laser communication

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Embodiment Construction

[0016] The test set and connections are attached figure 1 As shown, the parameters of each composition are described as:

[0017] 1) Half-wave plate: 1 / 2 inch aperture, use wavelength 780nm;

[0018] 2) Polarizing beam splitter: 1 / 2 inch polarizing beam splitting cube, splitting ratio 1:1;

[0019] 3) Optical fiber coupler: f=4.51mm, NA=0.57, using wavelength 780nm;

[0020] 4) Optical fiber splitter: 1×2 single-mode optical fiber coupler, splitting ratio 1:1;

[0021] 5) Single-photon detector: silicon-based single-photon detector, the model is SPCM-AQRH-16-FC produced by EXCELITAS company;

[0022] 6) Receiving telescope: diameter 100mm, compression ratio 10 times.

[0023] The specific implementation steps are:

[0024] 1) At the transmitting end, the signal to be transmitted is encoded and modulated and loaded onto the laser to generate a polarization-modulated optical pulse signal;

[0025] 2) The receiving end uses the half-wave plate 1 to adjust the polarization d...

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Abstract

The invention discloses a polarization demodulation and photon number resolving compatible detection device and method in laser communication. The device comprises a half wave plate, a polarization beam splitter, an optical fibre coupler, an optical fibre splitter, a single-photon detector and the like; polarization demodulated compound polarized light is split into two beams of mutually orthogonal linearly polarized light through the half wave plate and the polarization beam splitter, then, coupled into an optical fibre through the optical fibre coupler, and split into multiple channels by beam splitting; finally, each channel is detected through the single-photon detector; and the number of pulse photons received at this time is calculated according to the detection result of each channel. The polarization demodulation and photon number resolving compatible detection device and method in laser communication disclosed by the invention have the advantages of being convenient to construct, low in cost and extensible in photon counting laser communication.

Description

technical field [0001] The invention relates to receiving detection in laser communication, in particular to a polarization demodulation and photon number resolution method in photon counting laser communication. Background technique: [0002] At present, the conventional laser communication belongs to the strong optical communication system, and the laser modulation method can be divided into direct modulation or coherent modulation. The strong light direct modulation method requires a large increase in the volume power consumption of the communication terminal as the communication distance increases; while the coherent modulation method has a complex system, which is greatly affected by the environment and optical links, and there are unstable factors. Conventional strong optical communication systems are not suitable for large-loss channels such as deep space and underwater, and photon counting laser communication systems are required. Photon counting laser communication...

Claims

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Application Information

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IPC IPC(8): H04B10/61H04B10/70H04J14/06
CPCH04B10/614H04B10/6151H04B10/70H04J14/06
Inventor 张亮闻冠华王建宇舒嵘黎靖吴金才
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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