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Method and system for restraining dark count rate of multimode fiber coupled with superconducting nanowire single photon detector (SNSPD)

A multi-mode fiber, dark counting technology, applied in the field of photoelectric detection, can solve the problem of increasing dark count, and achieve the effect of reducing dark count, reducing noise equivalent coefficient, and wide application range

Inactive Publication Date: 2019-05-17
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of method and system for suppressing multimode fiber coupled SNSPD dark count, for solving the problem of multimode fiber and superconducting nanowire single photon detector in the prior art The problem of dark count increase in coupling

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  • Method and system for restraining dark count rate of multimode fiber coupled with superconducting nanowire single photon detector (SNSPD)
  • Method and system for restraining dark count rate of multimode fiber coupled with superconducting nanowire single photon detector (SNSPD)
  • Method and system for restraining dark count rate of multimode fiber coupled with superconducting nanowire single photon detector (SNSPD)

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Embodiment 1

[0056] see Figure 1 to Figure 6 , the present invention provides a system for suppressing the dark count of multimode fiber coupled SNSPD, the system for suppressing the dark count of multimode fiber coupled SNSPD includes: multimode fiber 3, the multimode fiber 3 is used to transmit incident light; cryogenic optics Filter 1, the low-temperature optical filter 1 is connected to one end of the multimode optical fiber 3; the low-temperature optical filter 1 includes a narrowband bandpass filter 11 and a low-pass filter 12, and the low-pass Optical filter 12 is positioned at the side of described narrow band pass filter 11, and described low pass filter 12 is parallel with described narrow band band pass filter 11; Described low pass filter 12 and described The narrowband bandpass filter 11 is used in conjunction with filtering the incident light to obtain light of the target wavelength; SNSPD2, the SNSPD2 is connected to the cryogenic optical filter 1 via a multimode fiber FC / P...

Embodiment 2

[0074] Please combine Figure 1 to Figure 9 refer to Figure 10 , the present invention also provides a kind of method that suppresses multimode fiber coupling SNSPD dark count, and the method for described suppression multimode fiber coupled SNSPD dark count comprises the steps:

[0075] 1) Filter the incident light to obtain the light of the target wavelength;

[0076] 2) The light of the target wavelength is coupled to the SNSPD via a multimode fiber for detection.

[0077] As an example, the method for suppressing the dark count of a multimode fiber-coupled SNSPD can be performed based on the system for suppressing the dark count of a multimode fiber-coupled SNSPD described in Embodiment 1, the system for suppressing the dark count of a multimode fiber-coupled SNSPD For details on the structure, please refer to Embodiment 1, which will not be repeated here.

[0078] As an example, in step 1), the incident light can be filtered using the low-temperature optical filter 1 ...

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Abstract

The invention provides a method and a system for restraining a dark count rate of a multimode fiber coupled with a superconducting nanowire single photon detector (SNSPD). The method for restraining the dark count rate of the multimode fiber coupled with the SNSPD comprises the following steps of filtering incident light to acquire the light with a target wavelength; and coupling the light with the target wavelength to the SNSPD for detecting. According to the method for restraining the dark count rate of the multimode fiber coupled with the SNSPD provided by the invention, the light beyond the target wavelength is detected after filtering, so that the dark count rate of the system can be significantly reduced.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection, and in particular relates to a method and system for suppressing the dark count of multimode optical fiber coupling SNSPD. Background technique [0002] In the application of spatial optical coupling, it is necessary to couple the superconducting nanowire single photon detector (SNSPD) with a large photosensitive surface to the multimode fiber (MMF) to achieve high light receiving and coupling efficiency. However, when the multimode fiber is coupled with the superconducting nanowire single photon detector, the room temperature end of the multimode fiber will radiate a large amount of infrared photons along the multimode fiber to the superconducting nanowire due to thermal radiation. At the nanowire single-photon detector, the dark count (DCR) of the system is increased. Contents of the invention [0003] In view of the above-mentioned shortcoming of prior art, the object of the...

Claims

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Application Information

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IPC IPC(8): G01J11/00
Inventor 张伟君张成俊尤立星周慧李浩
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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