Small-scaled high polarization-preserving quantum receiving module optical path on basis of polarization beam splitting of Glan prism

A Glan prism and polarization-maintaining quantum technology, which is applied in the fields of crystal optics, optical polarization, and optical components, can solve the problems of obvious deviation of spectral transmission-reflection ratio and low polarization-maintaining performance, so as to improve communication quality, improve optical efficiency, and reduce The effect of bit error rate

Inactive Publication Date: 2012-12-12
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used quantum receiving module is mainly composed of BS (energy beam splitter) and PBS (polarization beam splitter). Due to the performance limitations of BS and PBS, the polarization maintaining performance is not high (usually 100:1), and the light splitter The characteristic that the transmission-reflectance ratio deviates significantly

Method used

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  • Small-scaled high polarization-preserving quantum receiving module optical path on basis of polarization beam splitting of Glan prism
  • Small-scaled high polarization-preserving quantum receiving module optical path on basis of polarization beam splitting of Glan prism
  • Small-scaled high polarization-preserving quantum receiving module optical path on basis of polarization beam splitting of Glan prism

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Embodiment Construction

[0032] The present invention adopts following main devices:

[0033] 1. Glan prism: Glan-Laser Calcit Polarizers from Thorlabs are selected for Glan-Laser Calcit Polarizers, the model is GL5-B, which is composed of two pieces of calcite with air-filled gaps; its main performance parameters are extinction ratio 100000:1, surface shape less than or equal to λ / 4, the transmittance is greater than 92%, and the reflectance can reach 98% after coating.

[0034] 2. Reflector: The reflector is Broadband Dielectric Mirrors from Thorlabs, the model is BB05-E03; the main performance parameters are that the reflective surface is λ / 10, and the anti-reflection coating for H and V light can reach higher than 850nm. 99% reflectivity, so as to ensure the efficiency of the reflection direction, the extinction ratio of H and V light is better than 20000:1.

[0035] 3. Half-wave plate: Thorlabs' Zero-Order Wave Plates are selected for the half-wave plate, the model is WPH05M-830, and the materi...

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Abstract

The invention discloses a small-scaled high polarization-preserving quantum receiving module optical path on the basis of the polarization beam splitting of a Glan prism, which is suitable for a quantum key distribution system on the basis of polarization. On the basis of an optical polarization theory and a crystal optical theory, the invention fulfills the aims of small scale and high polarization preservation of a quantum receiving module by utilizing the excellent polarization beam splitting capacity of the Glan prism and the advantages of small volume, easiness for installation and the like and adopting the adjustable space energy beam splitting optical path design. The small-scaled high polarization-preserving quantum receiving module optical path adapts to the insistent demands of the space quantum communication on the small-scaled high-efficiency high-polarization-preserving and high-reliability quantum receiving module.

Description

technical field [0001] The present invention relates to optical elements, crystal optics, and optical polarization technology, and specifically refers to a quantum receiving module optical system based on Glan prism polarization beam splitting, space splitting, miniaturization, high efficiency, and high polarization maintenance, which is suitable for quantum communication In the polarization-based quantum key distribution system in the field, it can also be used in the emission and detection system of polarized photons. Background technique [0002] Secure communication is a transmission method that allows both parties to communicate to exchange information in a top-secret state. Many countries attach great importance to the research of secure communication. The research of quantum communication technology is closely related to the major needs of national security. It is expected to greatly improve the security of information transmission, the capacity and efficiency of info...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/28G02B27/10
Inventor 王建宇何志平陈爽吴金才舒嵘袁立银
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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