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

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...

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

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