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Method and system for inhibiting intermodulation distortion of microwave photonic system based on carrier band processing

A technology of intermodulation distortion and microwave photons, which is applied in transmission systems, transmission noise suppression, electromagnetic transmitters, etc.

Inactive Publication Date: 2014-09-24
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0011] The technical problem to be solved by the present invention is how to effectively suppress and control the intermodulation distortion of the microwave photonic system through simple design and simple operation, and improve the dynamic range of the microwave photonic system

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  • Method and system for inhibiting intermodulation distortion of microwave photonic system based on carrier band processing
  • Method and system for inhibiting intermodulation distortion of microwave photonic system based on carrier band processing
  • Method and system for inhibiting intermodulation distortion of microwave photonic system based on carrier band processing

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Embodiment Construction

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

[0039] Figure 4 It is a schematic structural diagram of a microwave photonic system intermodulation distortion suppression system based on carrier band processing in a preferred embodiment of the present invention; the microwave photonic system intermodulation distortion suppression system based on carrier band processing includes a continuous light source, a polarization control circuit, and an intensity modulation device, carrier band processor, and dual-tone radio frequency signal generation source; the continuous light wave emitted by the continuous light source enters the intensity modulator through the polarization controller, and the continuous light wave enters the carrier band processor after modula...

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Abstract

The invention discloses a method for inhibiting intermodulation distortion of a microwave photonic system based on carrier band processing. The method comprises a step S1 of establishing a modulation model of the microwave photonic system, a step S2 of analyzing the origin of third-order nonlinear intermodulation distortion to obtain three major intermodulation distortion components, and simultaneously, determining the relation between a carrier band phase shift amount theta and the major intermodulation distortion components, and a step S3 of adjusting the phase shift amount of the carrier band phase to theta so that the three major intermodulation distortion components obtained in the step S1 are cancelled out mutually. The invention also discloses a system for inhibiting intermodulation distortion of the microwave photonic system based on carrier band processing; the system comprises a continuous light source, a polarization control circuit, an intensity modulator, a carrier band processor and a double-tone radial frequency signal generation source. The method and the system have the advantages that no extra distortion needs to be established and the structure is simple, the inhibition of distortion can be completely only by introducing the relatively fixed carrier band phase shift amount, the performance is reliable and stable, and in addition, the advantages of an integrated device can be integrated and the integrated device is taken as the carrier band processor so that the cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of microwave photonic systems, and more particularly to a method and system for suppressing intermodulation distortion of microwave photonic systems based on carrier band processing. Background technique [0002] Microwave photonic systems have significant advantages such as low cost and high bandwidth. However, the inherent nonlinear characteristics of the intensity modulator of microwave photonic systems will lead to distortion interference in the output signal, resulting in misjudgment of information. The suppression of intermodulation distortion can effectively improve the spurious-free dynamic range of the microwave photonic system and improve its ability to process weak and strong signals. High dynamic range microwave photonic systems have important application value in radar, electronic warfare and other fields. [0003] In the prior art, there is one of the following technical solutions for intermod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/54H04B15/00
Inventor 徐坤戴一堂崔岩尹飞飞李建强
Owner BEIJING UNIV OF POSTS & TELECOMM
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