Method for improving linearity of directly modulated microwave photonic link based on push-pull structure and compensation algorithm

A microwave photonic and route-based technology, applied in the field of microwave photonic signal transmission and processing, achieves the effects of adaptive complexity, large bandwidth and capacity, and low technological level requirements

Active Publication Date: 2017-03-22
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] Aiming at the above defects or improvement requirements of the prior art, the present invention provides a method for improving the linearity of a direct modulation microwave photon link based on a push-pull joint adaptive post-compensation algorithm. Technical Problems of Intermodulation Distortion Signals of Order and Even Order

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  • Method for improving linearity of directly modulated microwave photonic link based on push-pull structure and compensation algorithm
  • Method for improving linearity of directly modulated microwave photonic link based on push-pull structure and compensation algorithm
  • Method for improving linearity of directly modulated microwave photonic link based on push-pull structure and compensation algorithm

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Embodiment Construction

[0041] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0042] figure 1 is a flowchart constructed according to a preferred embodiment of the present invention, figure 2 It is a schematic diagram of the system constructed according to the preferred embodiment of the present invention, such as figure 1 and figure 2 As shown, the overall system structure diagram of the direct modulation microwave photonic link based on the push-pull structure and ...

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Abstract

The invention belongs to the technical field of microwave photonic signal transmission and processing and discloses a method for improving the linearity of a directly modulated microwave photonic link based on a push-pull structure and an adaptive post-compensation algorithm. The method comprises the following steps: (a) dividing an initial signal into upper and lower signals; (b) performing push-pull modulation on the upper and lower signals; (c) suppressing an even-order distortion signal by using balance detection; (d) suppressing a third-order intermodulation distortion signal (IMD3) by using the adaptive post-compensation algorithm. The method realizes a large-broadband high-linearity directly modulated microwave photonic link in which all even-order distortion signals and the third-order intermodulation distortion signals are suppressed, and the method has the characteristics of low cost, compact structure and high cost performance.

Description

technical field [0001] The invention belongs to the technical field of microwave photon signal transmission and processing, and more specifically relates to a method for improving the linearity of a direct modulation microwave photon link based on a push-pull structure and a post-compensation algorithm. Background technique [0002] Microwave photonics is an interdisciplinary subject that combines the fields of microwave and photonics. Microwave photonics technology modulates microwave signals onto optical signals to achieve long-distance transmission through optical fibers. It effectively combines the advantages of optical fiber communication and radio communication. Advantages, low loss, large capacity, anti-electromagnetic interference, easy to use, etc., so it is widely used in radio-on-fiber (ROF) systems, electronic warfare systems, array radar, cable TV and other applications. Spurious-free dynamic range (SFDR) is one of the most important indicators to describe the p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/2507H04B10/2575H04B10/50H04B10/516
CPCH04B10/2507H04B10/2575H04B10/504H04B10/516
Inventor 邓磊叶尧陈世超陈晓曼付松年唐明刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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