Microwave source phase noise measuring device based on bidirectional optical phase modulator

A phase modulator and phase noise technology, applied in electromagnetic wave transmission systems, electrical components, transmission systems, etc., can solve the problems of large insertion loss, reduce system conversion efficiency, increase system cost and complexity, and reduce noise floor, Spectral purity, avoiding the effect of low conversion efficiency

Active Publication Date: 2021-10-22
SUZHOU UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the use of cascaded modulators increases the cost and complexity of the system, and leads to large insertion loss, which reduces the conversion efficiency of the system

Method used

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  • Microwave source phase noise measuring device based on bidirectional optical phase modulator
  • Microwave source phase noise measuring device based on bidirectional optical phase modulator
  • Microwave source phase noise measuring device based on bidirectional optical phase modulator

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0027] like figure 1 As shown, it is a microwave source phase noise measurement device based on a bidirectional optical phase modulator in a preferred embodiment of the present invention, including:

[0028] Microwave power divider 10, laser 20, optical circulator 30, first branch, second branch, optical coupler 60, photodetector 70 and signal analysis device 90, described first branch is provided with bidirectional An optical phase modulator 41, a first fiber Bragg grating 42, and a single-mode fiber 43, a second fiber Bragg grating 51 and an adjustable optical delay line 52 are arranged in sequence in the second branch, and the optical circulator 30 is set There are three ports...

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Abstract

The invention discloses a microwave source phase noise measuring device based on a bidirectional optical phase modulator, which comprises a microwave power divider, a laser, an optical circulator, a first branch, a second branch, an optical coupler, a photoelectric detector and a signal analysis device. A bidirectional optical phase modulator, a first fiber bragg grating and a single-mode fiber are sequentially arranged in the first branch, a second fiber bragg grating and an adjustable optical delay line are sequentially arranged in the second branch, the optical circulator is provided with three ports, and the three ports are respectively connected with the laser, the bidirectional optical phase modulator and the second fiber bragg grating. According to the invention, the single bidirectional optical phase modulator is utilized to realize a full-optical-domain frequency mixing function, so that the use of an electric frequency mixer is avoided, and the use of active devices such as a microwave amplifier is reduced. The device has the advantages of simple structure, low cost, large working bandwidth and flat response, the noise floor of the phase noise measuring system is reduced, and the measuring precision and sensitivity are improved.

Description

technical field [0001] The invention relates to the technical field of phase noise measurement, in particular to a microwave source phase noise measurement device based on a bidirectional optical phase modulator. Background technique [0002] With the continuous development of microwave oscillator technology, especially the emergence of photoelectric oscillators that can directly generate ultra-high frequency and ultra-low phase noise microwave signals, it poses a great challenge to the existing phase noise measurement technology. The frequency discrimination method based on optical delay line is a method with great potential for phase noise measurement of microwave sources. This method can achieve high phase noise measurement sensitivity with the help of long delay provided by low-loss optical fiber. However, in this scheme, the operating bandwidth is usually limited by electronic devices such as electric phase shifters, electric amplifiers, and electric mixers, and before ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/079H04B10/548
CPCH04B10/0795H04B10/548
Inventor 周沛谢溢锋李念强江芝东周志华
Owner SUZHOU UNIV
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