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Image Interference Suppression Mixer Based on Fiber Dispersion Effect

A technology of image interference and fiber dispersion, which is applied in the field of microwave photonics, can solve the problems that the bandwidth range cannot be effectively expanded, and cannot be applied to high frequency bands, etc., so as to get rid of the dependence on phase accuracy, realize image interference, and overcome frequency limitations. Effect

Active Publication Date: 2021-01-29
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Claims
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Problems solved by technology

In addition, the 90-degree bridge is often limited by the frequency, the bandwidth range cannot be effectively expanded, and it cannot be applied to high-frequency bands and large-bandwidth communication systems

Method used

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  • Image Interference Suppression Mixer Based on Fiber Dispersion Effect
  • Image Interference Suppression Mixer Based on Fiber Dispersion Effect

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Embodiment Construction

[0039] 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 specific embodiments and with reference to the accompanying drawings.

[0040] The main purpose of the present invention is to propose an image interference suppression mixer based on the fiber dispersion effect, so as to get rid of the dependence on the phase shifter and the 90-degree bridge, and avoid the influence of phase inaccuracy and bandwidth limitation.

[0041] Based on this, see figure 1 As shown, an embodiment of the present invention provides an image interference suppression mixer based on the fiber dispersion effect. The mixer and its working process are described in detail as follows, including:

[0042] A distributed feedback laser 1, whose function is to provide a high-quality, low-phase-noise optical carrier signal with a wavelength in the range of 1530nm-1610nm;

[0043] ...

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Abstract

The invention discloses an image interference suppression mixer based on optical fiber dispersion effect, comprising: a distributed feedback laser, a dual-parallel Mach-Zehnder modulator, an optical power amplifier, a section of single-mode optical fiber, and a photoelectric detector. Three DC sources, a reference signal source, a power attenuator, and an ultra-wideband antenna. In the present invention, only by adjusting the three DC sources, the suppression of image interference and the compensation of periodic power dissipation caused by long-distance optical fiber transmission can be realized simultaneously. The structure of the mixer in the present invention breaks away from the dependence on the phase shifter or the quadrature coupler, avoids the problem of image suppression performance weakening caused by inaccurate phase, and has simple structure and convenient operation.

Description

technical field [0001] The invention belongs to the field of microwave photonics, and in particular relates to an image interference suppression mixer based on optical fiber dispersion effect. Background technique [0002] In recent years, the development of microwave photonics has received extensive attention. Compared with traditional electrical technologies, microwave photonics has the advantages of larger bandwidth, better isolation, anti-electromagnetic interference, light weight, and small size. Among them, microwave photonic mixers play an important role in the process of down-converting high-frequency signals or up-converting low-frequency signals. However, in the actual application process, the artificial image signal has obvious interference to the frequency conversion result of the mixer. Since the intermediate frequency signal after frequency conversion of the image signal and the intermediate frequency signal after frequency conversion of the radio frequency si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/2513H04B10/54
CPCH04B10/2513H04B10/54
Inventor 林涛张志珂刘建国郭锦锦赵尚弘
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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