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Photoelectric detector frequency response measurement method and device based on two-tone modulation

A photoelectric detector and two-tone modulation technology, which is applied in the direction of measuring devices, optical instrument testing, machine/structural component testing, etc., can solve the problems of non-linear error of measurement results, inability to measure phase response, etc., to improve measurement accuracy, Avoid nonlinear errors and external interference, the effect of frequency range expansion

Active Publication Date: 2021-09-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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AI Technical Summary

Problems solved by technology

In the process of calculating the final frequency response of this technology, due to the need for upper and lower optical power, it will cause nonlinear errors to the measurement results; in addition, due to the two signals used by the system, the interference of various external factors and the non Linear, making it impossible to measure the phase response of the system

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  • Photoelectric detector frequency response measurement method and device based on two-tone modulation
  • Photoelectric detector frequency response measurement method and device based on two-tone modulation
  • Photoelectric detector frequency response measurement method and device based on two-tone modulation

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Embodiment Construction

[0031] Aiming at the deficiencies in the prior art, the solution idea of ​​the present invention is to modulate the dual-tone microwave signal on the same optical carrier to generate an optical double-sideband signal that suppresses the carrier; Convert it into an electrical signal, extract the up-conversion and down-conversion signal components, and calculate the amplitude-phase response of the photodetector to be tested accordingly.

[0032] The photodetector frequency response measurement method based on two-tone modulation proposed by the present invention is as follows:

[0033] The two channels have different frequencies ω 1 , ω 2 The microwave signal is modulated on the same optical carrier to generate an optical double-sideband signal of suppressed carrier; use the photodetector to be tested to convert the optical double-sideband signal of suppressed carrier into an electrical signal, and extract the up-converted and down-converted frequency Signal component, and obt...

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Abstract

The invention discloses a photoelectric detector frequency response measurement method based on two-tone modulation, which comprises the following steps of: modulating two paths of microwave signals with different frequencies omega1 and omega2 on the same path of optical carrier to generate an optical double-sideband signal for suppressing the carrier; and converting the carrier-suppressed optical double-sideband signal into an electric signal by using a photoelectric detector to be detected, extracting an up-conversion signal component and a down-conversion signal component in the electric signal, and calculating the amplitude-phase response of the photoelectric detector to be detected according to the up-conversion signal component and the down-conversion signal component. The invention further discloses a photoelectric detector frequency response measurement device based on two-tone modulation. Compared with the prior art, measurement errors introduced in the measurement process can be effectively reduced, the measurement accuracy is improved, and the dynamic range is widened.

Description

technical field [0001] The invention relates to a method for measuring the frequency response of a photoelectric detector, which belongs to the technical field intersecting photoelectric device measurement and microwave photonics. Background technique [0002] Test and measurement technology is the necessary basis for many scientific research and scientific and technological undertakings, and its own development speed and level directly or indirectly affect the progress of various scientific and technological innovations. Since the birth of optical fiber communication in the 1970s, the continuous improvement of spectral response testing technology has promoted the rapid development of the industry, quickly brought mankind into the information age, and completely changed people's way of life. Today, the optical fiber communication system has almost replaced all wired communication methods and has become an important foundation for the national information highway and the info...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16G01M11/00
CPCG01R23/16G01M11/333
Inventor 薛敏徐宗新潘时龙王琦衡雨清张心贲
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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