A broadband photodetector responsivity tester and its test method

A technology of photodetectors and testing methods, applied in the direction of instruments, etc., can solve the problem that the responsivity measurement of ultra-bandwidth photodetectors cannot be satisfied, the frequency sweep method cannot get rid of the extra calibration of electro-optical conversion devices, and the signal ratio and dynamic range of the intensity-to-noise method are small etc. to achieve the effect of realizing self-referencing measurement, ensuring self-referencing measurement, improving system signal-to-noise ratio and dynamic range

Active Publication Date: 2020-01-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is: from the background technology, it can be seen that the existing technology has these problems: (1) the signal ratio and the dynamic range of the intensity noise method are small; , resulting in high measurement cost, unable to meet the problem of ultra-bandwidth photodetector responsivity measurement; (3) The frequency sweep method cannot get rid of the additional calibration of the electro-optical conversion device; (4) The measurement accuracy and stability of the optical heterodyne method are not high ; In order to solve these four problems, the invention provides a kind of broadband photodetector responsivity tester and testing method thereof

Method used

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  • A broadband photodetector responsivity tester and its test method
  • A broadband photodetector responsivity tester and its test method
  • A broadband photodetector responsivity tester and its test method

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Embodiment 1

[0048] The optical frequency comb output module in this embodiment adopts a mode-locked laser with a repetition frequency of 10 GHz, the dual-drive intensity modulation module adopts a dual-drive Mach-Zehnder modulator, and the frequency of setting signal source 1 to output a sinusoidal microwave signal is 3.01 GHz, and the signal The frequency of the sinusoidal microwave signal output by the second source is 3GHz, and the optical signal output by the dual-drive intensity modulation module is converted into an electrical signal by the photodetector under test, which is analyzed and measured by the spectrum analysis and data processing module.

[0049] When k=0, the measurement frequency is 6.01GHz (f 1 +f 2 ), 0.01GHz (f 1 -f 2 ) amplitude values, respectively A(f 1 +f 2 )=0.0041V, A(f 1 -f 2 ) = 0.0038V, then according to (4) formula, the photodetector to be tested can be obtained at a frequency of 6.01GHz (f 1 +f 2 ) and 0.01GHz (f 1 -f 2 ) ratio of responsiveness ...

Embodiment 2

[0053] The optical frequency comb output module in this embodiment adopts a mode-locked laser with a repetition frequency of 10 GHz, the dual-drive intensity modulation module adopts a dual-drive Mach-Zehnder modulator, and the frequency of setting signal source 1 to output a sinusoidal microwave signal is 3.81 GHz, and the signal The frequency of the sinusoidal microwave signal output by the second source is 3.8 GHz. The optical signal output by the dual-drive intensity modulation module is converted into an electrical signal by the photodetector to be tested, which is analyzed and measured by the spectrum analysis and data processing module.

[0054] When k=1, the measurement frequency is 17.61GHz (f m +f 1 +f 2 ), 10.01GHz (f m +f 1 -f 2 ) amplitude values, respectively A(f m +f 1 +f 2 )=0.0036V, A(f m +f 1 -f 2 )=0.0029V, then according to formula (4), it can be obtained that the photodetector to be tested is at a frequency of 17.61GHz (f m +f 1 +f 2 ) and 10....

Embodiment 3

[0063] The optical frequency comb output module in this embodiment adopts a mode-locked laser with a repetition frequency of 10 GHz, and the dual-drive intensity modulation module adopts a dual-drive Mach-Zehnder modulator. The frequency of setting signal source 1 to output a sinusoidal microwave signal is 4.51 GHz, and the signal The frequency of the sinusoidal microwave signal output by the second source is 4.5 GHz. The optical signal output by the dual-drive intensity modulation module is converted into an electrical signal by the photodetector under test, which is analyzed and measured by the spectrum analysis and data processing module.

[0064] When k=2, the measurement frequency is 29.01GHz (2f m +f 1 +f 2 ), 20.01GHz (2f m +f 1 -f 2 ) amplitude values, respectively A(2f m +f 1 +f 2 )=0.0031V, A(2f m +f 1 -f 2 )=0.0021V, then according to formula (4), the photodetector to be tested can be obtained at a frequency of 29.01GHz (2f m +f 1 +f 2 ) and 20.01GHz (2...

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Abstract

The invention discloses a photodetector responsivity tester and a test method thereof, which relate to the field of optoelectronic technology; it includes an optical frequency comb output module, a dual-drive intensity modulation module and a photodetector to be tested, which are optically connected in sequence, and a photoelectric detector to be tested. The frequency spectrum analysis and data processing module that photodetector is electrically connected also include to connect signal source one and signal source two with two radio frequency input ends of dual-drive intensity modulation module respectively; The present invention has solved these four problems: (1) scanning The frequency method cannot get rid of the additional calibration of the electro-optical conversion device; (2) the measurement accuracy and stability of the optical heterodyne method are not high; (3) the signal ratio and dynamic range of the intensity-to-noise method are small; (4) the frequency shift heterodyne method is affected by Limited to the bandwidth of the electro-optical conversion device, the measurement cost is high, the measurement accuracy is low, and the reliability is poor, which cannot meet the responsivity measurement of ultra-bandwidth photodetectors.

Description

technical field [0001] The invention relates to the measurement technology of photodetector responsivity in the field of optoelectronic technology, in particular to a photodetector responsivity tester and a test method thereof. Background technique [0002] Photodetectors are an essential part of high-speed optical fiber communication and coherent optical communication systems, and can be used for the generation, recovery, and detection of microwave signals. With the rapid increase of communication rate and bandwidth, photodetectors are gradually facing the challenge of insufficient bandwidth in practical applications. The development of high-speed, wide-bandwidth photodetectors has become an important branch of the current research field of optoelectronic devices. Its responsivity characteristics have been widely concerned and evaluated because they reflect the main parameters of photodetector speed and bandwidth performance. At the same time, the evaluation of responsivity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D18/00
CPCG01D18/00
Inventor 张尚剑王恒邹新海王梦珂张雅丽刘永
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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