A photodetector frequency response measurement method and measurement system

Abstract

The invention discloses a photoelectric detector frequency response measurement method and a measurement system thereof and belongs to the photoelectric device measurement and microwave photonics technology field. In the invention, an intensity modulator is adopted to modulate a microwave signal to a optical carrier wave, after proper direct current bias, an optical double-sideband detecting signal which restrains the carrier wave is generated. An optical beam splitter divides an optical signal into two paths. One path of the optical signal is input into an optical power meter so as to detect optical power and the other path of the optical signal is input into a photoelectric detector to be measured. A microwave power meter measures power of a microwave signal output by the photoelectric detector to be measured. Frequency scanning is performed on the microwave signal so that changing curves of optical power of an optical detection signal and microwave signal power output by the photoelectric detector along with frequencies can be acquired. According to a photoelectric detector frequency response definition, a frequency response curve of the photoelectric detector to be measured can be acquired. The invention also discloses a photoelectric detector frequency response measurement system. Compared to the prior art, a measurement range is expanded and measurement precision and efficiency are increased.

Description

technical field [0001] The invention relates to a photodetector frequency response measurement method and a measurement system, in particular to a photodetector frequency response measurement method and a measurement device based on intensity modulation, which belong to the technical fields of 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 forwar...

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Problems solved by technology

[0004] The key device for time-domain method to measure the frequency response of photodetectors is sampling oscilloscope, but the limitation of time-domain method is that the frequency range of measuring photodetectors is limited by the bandwidth of sampling oscilloscopes

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