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A photonic microwave down-conversion device and method

A frequency conversion device, a photonic microwave technology, which is applied to equipment that generates/processes RF signals by optical methods, optical fiber transmission, optical fiber radio, etc., and can solve the problems of poor radio frequency isolation, difficulty in flexible tuning, and complicated structure of microwave down-conversion systems. , to achieve the effect of complete radio frequency isolation and flexible regulation

Active Publication Date: 2020-02-18
DALIAN UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] The invention provides a photonic microwave down-conversion device and method, which can effectively solve the problems of complex structure, poor radio frequency isolation, and difficulty in flexible tuning of the microwave down-conversion system in the background art.

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  • A photonic microwave down-conversion device and method
  • A photonic microwave down-conversion device and method
  • A photonic microwave down-conversion device and method

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Embodiment Construction

[0039] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0040] figure 2 It is a system block diagram of a photonic microwave down-conversion device according to an embodiment of the present invention, including a wavelength-tunable laser, an electro-optic modulator, an optical narrowband notch filter, an optical splitter, a polarization beam splitter, an optical fiber a, an optical fiber b, and a polarization beam combiner , a first photodetector, an electrical combiner, and a second photodetector.

[0041] The wavelength tunable laser, electro-optic modulator, optical narrow-band notch filter, optical splitter, polarization beam splitter, optical fiber a, optical fiber b, polarization beam combiner and first photodetector are sequentially connected through optical fiber.

[0042] The lengths of the optical fiber a and the optical fiber b are different;

[00...

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Abstract

A photonic microwave down-conversion system and method. The oscillation loop includes an electro-optic modulator, optical narrow-band notch filter, photodetector and electrical combiner which has the function of generating the local oscillator signal. The frequency of the local oscillator signal can be flexibly adjusted by changing the lightwave frequency output from the wavelength tunable laser. The phase modulation function of the electro-optic modulator enables no RF signal output from the down-conversion photodetector It can not only down convert the RF signals with different frequencies to the intermediate frequency signals with the same frequency, but also can down convert the RF signals with the same frequency to the intermediate frequency signals with different frequencies. This can effectively overcome the limitations of complicated structure, poor RF isolation and difficulty in flexible tuning for microwave down-conversion system in the prior arts.

Description

technical field [0001] The invention belongs to the technical field of microwave signal processing, and in particular relates to a photonic microwave down-conversion device and method. Background technique [0002] Microwave down-conversion is one of the key technologies of microwave signal processing. Its function is to change the frequency domain of the microwave signal received by the antenna, and reduce the frequency to a processable intermediate frequency band. Microwave down-conversion technology has extensive and important applications in satellite communication, wireless communication, radar and other fields. The traditional microwave down-conversion technology based on electrical methods is mainly realized through the nonlinear characteristics of electronic devices such as diodes or FETs. The frequency range and bandwidth of frequency conversion processing are limited by the performance of electrical devices. With the increase of microwave frequency , the frequency...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/2575H04B10/50H04J14/06
CPCH04B10/2575H04B10/5057H04J14/06H04B10/00H04B2210/006H04B10/548H04B10/616
Inventor 韩秀友邵宇辰武震林赵明山
Owner DALIAN UNIV OF TECH
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