Method and device for measuring frequency response of photodetector based on dual-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, and improve measurement efficiency

Active Publication Date: 2022-05-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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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  • Method and device for measuring frequency response of photodetector based on dual-tone modulation
  • Method and device for measuring frequency response of photodetector based on dual-tone modulation
  • Method and device for measuring frequency response of photodetector based on dual-tone modulation

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Embodiment Construction

[0031] In view of the deficiencies of the prior art, the solution of the present invention is to modulate the dual-tone microwave signal on the same optical carrier to generate an optical double-sideband signal for suppressing 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 measured accordingly.

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

[0033] Put the two circuits with different frequencies ω 1 , ω 2 The microwave signal is modulated on the same optical carrier to generate an optical double-sideband signal that suppresses the carrier; the photodetector to be tested is used to convert the optical double-sideband signal of the suppressed carrier into an electrical signal, and the up-conversion and down-conversion are extracted. s...

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Abstract

The invention discloses a method for measuring the frequency response of a photoelectric detector based on dual-tone modulation. Two channels with 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-band signal of suppressed carrier into an electrical signal, and extract the up-converted and down-converted frequency Signal components, and calculate the amplitude-phase response of the photodetector to be tested accordingly. The invention also discloses a photodetector frequency response measuring device based on dual-tone modulation. Compared with the prior art, the invention can effectively reduce the measurement error introduced in the measurement process, improve the measurement accuracy and improve the dynamic range.

Description

technical field [0001] The invention relates to a frequency response measurement method of a photoelectric detector, which belongs to the technical field of the intersection of 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, brought mankind into the information age, and completely changed people's way of life. Today, the optical fiber communication system has replaced almost all wired communication methods and has become an important basis for the national information highway and the informatizati...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/02
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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