High-frequency microwave signal full-gloss down conversion system

A high-frequency microwave and optical down-conversion technology, applied in the field of microwave photonics, can solve the problems of reducing the performance of the frequency conversion system, large link loss, weak intermediate frequency signal, etc., to achieve the effect of optimizing system performance, high isolation, and reducing complexity

Inactive Publication Date: 2012-01-18
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the cascading of modulators makes the loss of the link larger, the gain is limited, and the intermediate

Method used

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  • High-frequency microwave signal full-gloss down conversion system
  • High-frequency microwave signal full-gloss down conversion system
  • High-frequency microwave signal full-gloss down conversion system

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[0025] The specific embodiments of the present invention will be described in further detail below in conjunction with the drawings and embodiments. The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.

[0026] figure 2 This is a structural diagram of an embodiment of the integrated dual-parallel intensity modulator used in the present invention, which includes two radio frequency input ports 33, 34, three DC bias terminals 31, 32, and 35, and one optical output port. In this embodiment, one of the RF input ports is used to input microwave signals, and the other RF input port is used to input local oscillator signals. The gain of the high-frequency microwave signal all-optical down-conversion system can be adjusted by changing the first two DC offsets 31, 32. And linearity, by changing the third DC bias 35 to control the coupling mode of the upper and lower signals, adjust the gain of the high-frequency microwa...

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Abstract

The invention provides a high-frequency microwave signal full-gloss down conversion system which comprises a light source, a dual-parallel intensity modulator, a polarization controller and a low-frequency detector, wherein the light source is used for generating light carriers in any polarization state; the dual-parallel intensity modulator is in a two-way radio frequency input mode, comprises two radio frequency input ports and is used for inputting a high-frequency microwave signal and a local oscillation signal respectively through the two input ports, simultaneously loading the high-frequency microwave signal and the local oscillation signal to a light carrier as well as modulating and coupling the two paths of optical signals and then outputting the modulated and coupled optical signals through one port; the polarization controller is connected between the light source and the dual- parallel intensity modulator and is used for adjusting the polarization states of the light carriers output by the light source to be consistent with that of the main shaft of the dual-parallel intensity modulator; the low-frequency detector is connected with the dual parallel intensity modulator and is used for converting the optical signals output by the modulator into electric signals and shooting the high-frequency microwave signal difference to low-mid frequency (LMF) so as to realize the full-gloss down conversion of the microwave signal and simultaneously filter out high-frequency interference signals. The system provided by the invention has the advantages of low cost, simple structure, reliable performance and capability of realizing the direct down conversion of the high-frequency microwave signal.

Description

technical field [0001] The invention relates to the field of microwave photon technology, in particular to an all-optical down-conversion system for high-frequency microwave signals. Background technique [0002] With the development of microwave communication technology in the future, the radio frequency system will gradually achieve high frequency and broadband, which will pose challenges to the subsequent analog-to-digital conversion and digital processing units. In order to break through the bottleneck in the development of electronic devices, microwave down-conversion technology must be introduced to perform analog-to-digital conversion and digital processing in the low-to-medium frequency range, which will greatly reduce the difficulty of subsequent processing and the bandwidth requirements for electronic devices. At present, the traditional microwave down-conversion technology needs to adopt multi-level conversion, and the number of components used is large, the struc...

Claims

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Application Information

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IPC IPC(8): H03D7/00
Inventor 徐坤段瑞敏戴键伍剑林金桐
Owner BEIJING UNIV OF POSTS & TELECOMM
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