A method and device for measuring the frequency response of a photodetector based on frequency mixing

A technology of photodetector and measurement method, which is applied in the direction of measurement device, optical instrument test, machine/structural component test, etc. Efficiency, effect of reducing frequency requirements

Active Publication Date: 2020-10-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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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  • A method and device for measuring the frequency response of a photodetector based on frequency mixing
  • A method and device for measuring the frequency response of a photodetector based on frequency mixing
  • A method and device for measuring the frequency response of a photodetector 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

A frequency mixing-based frequency response measurement method and device for a photodetector. Said method comprises: using two microwave signals with angular frequencies of Δω and ωe to modulate two homogenous optical carriers respectively, so as to respectively obtain a carrier-suppressed optical single-sideband modulation signal and a carrier-suppressed optical double-sideband modulation signal, ωe < Δω; coupling the carrier-suppressed optical single-sideband modulation signal and the carrier-suppressed optical double-sideband modulation signal, and then inputting same into a photodetector to be measured, and measuring a Δω + ωe component and a Δω - ωe component in an optical current signal outputted by said photodetector; and according to the measured data, calculating frequency responses of said photodetector at frequencies of Δω + ωe and Δω - ωe. The present invention can break through the limitation of the bandwidth of the electro-optic modulator, double the measurement range of the photoelectric frequency response, improve the measurement efficiency, and reduce the measurement time and the measurement cost.

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 Patents(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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