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Photoelectric detector frequency response measurement method based on frequency mixing

A technology of photodetector and measurement method, which is applied in the direction of measuring device, optical instrument test, machine/structural component test, etc. It can solve the problems such as difficult to obtain the frequency response of photodetector, achieve the expansion of measurable frequency range and improve the measurement Efficiency, the effect of reducing frequency requirements

Active Publication Date: 2019-12-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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AI Technical Summary

Problems solved by technology

However, the 3dB analog bandwidth of existing mature commercial photodetectors is more than twice that of photoelectric modulators, greater than 50GHz
It is difficult for this technology to obtain the frequency response of the photodetector with a bandwidth greater than 50GHz

Method used

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  • Photoelectric detector frequency response measurement method based on frequency mixing
  • Photoelectric detector frequency response measurement method based on frequency mixing
  • Photoelectric detector frequency response measurement method based on frequency mixing

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Embodiment Construction

[0031] Aiming at the deficiencies in the prior art, the thinking of the present invention is to use the carrier-suppressed optical single-sideband signal and the carrier-suppressed optical double-sideband signal to mix, thereby eliminating the overlapping problem of the spectral response measured by the up- and down-conversion signals, The measurement range can be greatly expanded, the measurement efficiency is improved, and the measurement time and cost are reduced.

[0032] The photodetector frequency response measuring method proposed by the present invention is specifically as follows:

[0033] Use the angular frequencies Δω and ω e Carrier-suppressed optical single-sideband modulation and carrier-suppressed optical double-sideband modulation are performed on two homologous optical carriers by the two microwave signals, respectively, and the carrier-suppressed optical single-sideband modulation signal and the carrier-suppressed optical double-sideband modulation signal are...

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Abstract

The invention discloses a photoelectric detector frequency response measurement method based on frequency mixing. The method comprises the following steps: respectively modulating two paths of homologous optical carriers by using two paths of microwave signals with angular frequencies of delta omega and omega e to respectively obtain a carrier-suppressed optical single-sideband modulation signal and a carrier-suppressed optical double-sideband modulation signal under the condition of being less than the delta omega by the omega e; coupling the carrier-suppressed optical single-sideband modulation signal and the carrier-suppressed optical double-sideband modulation signal and then inputting the coupled signals into a to-be-measured photoelectric detector and measuring a (delta omega+omega e) component and a (delta omega-omega e) component in a photocurrent signal outputted by the to-be-measured photoelectric detector; and calculating a frequency response of the to-be-measured photoelectric detector at frequencies of delta omega+omega e and delta omega-omega e based on the measured data. In addition, the invention also discloses a photoelectric detector frequency response measurementdevice based on frequency mixing. According to the invention, the limitation of the bandwidth of the electro-optical modulator can be broken through; the measurement range of the photoelectric frequency response is doubled and the measurement efficiency is improved; and the measurement time and the measurement cost are reduced.

Description

technical field [0001] The invention relates to a method for measuring the frequency response of a photoelectric detector, in particular to a method and device for measuring the frequency response of a photoelectric detector based on frequency mixing, and belongs to the technical field intersecting photoelectric device measurement and microwave photonics. Background technique [0002] Optical fiber communication has many advantages such as anti-electromagnetic interference, anti-corrosion, light weight, and large capacity, so it is widely used in many fields such as high-energy physics, anti-nuclear radiation communication systems, submarines, warships, aircraft, missile control communication systems, and the Internet. At present, optical fiber communication is developing in the direction of high speed, high efficiency, large capacity and long distance optical fiber transmission. As the degree of informatization becomes higher and higher, corresponding requirements are put f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16G01M11/00
CPCG01M11/333G01R23/16
Inventor 薛敏吕明辉潘时龙
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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