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A Filterless Image Rejection Downconversion Method Based on Cascaded Modulators

An image suppression and modulator technology, applied in the field of optical communication, to achieve the effects of simple equipment, high image suppression ratio, and strong practical operability

Active Publication Date: 2021-10-15
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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The structure is relatively simple and easy to implement

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  • A Filterless Image Rejection Downconversion Method Based on Cascaded Modulators
  • A Filterless Image Rejection Downconversion Method Based on Cascaded Modulators
  • A Filterless Image Rejection Downconversion Method Based on Cascaded Modulators

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing the embodiment of the present invention is described in detail: present embodiment is carried out under the premise of technical solution of the present invention, has provided detailed implementation mode and concrete operation process, but protection scope of the present invention is not limited to subordinates Example of:

[0030] figure 1 It is a principle diagram of realizing image suppression down-conversion by using MZM cascaded PDM-MZM in the present invention. This scheme uses MZM to modulate the RF signal with double sideband, and then input it to PDM-MZM. In PDM-MZM, the optical carrier is divided into two channels, which are respectively input into X-pol MZM and Y-pol MZM. PDM-MZM The two MZMs of the two MZMs both perform double-sideband modulation on the LO signal and the 90° phase-shifted LO signal. Then the PBC at the back end of the PDM-MZM performs polarization multiplexing on the two beams. After being ...

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Abstract

The invention discloses a non-filtering image suppression down-conversion method based on cascade modulators. The invention relates to the field of microwave technology and optical communication technology. inhibition. The method is as shown in Figure 1 of the specification, including a light source, a signal source, a Mach-Zehnder modulator MZM, a polarization division multiplexing Mach-Zehnder modulator PDM‑MZM, an erbium-doped fiber amplifier, a polarization controller, and a polarization beam splitter , photodetectors, and electrical 90° couplers. MZM modulates useful radio frequency signals and image signals, and PDM‑MZM modulates and polarization-multiplexes orthogonal local oscillator signals. The polarization multiplexed light is divided into two channels by a polarization beam splitter to obtain IF and Q intermediate frequency signals, and the two IF signals are coupled through a 90° coupler to achieve image suppression down-conversion. The invention has the advantages of simple structure, no filter, large frequency tuning range and working bandwidth, and high image rejection ratio.

Description

technical field [0001] The invention relates to the field of optical communication technology, microwave technology and radar technology, and mainly relates to the use of photonics technology to realize the down-conversion reception of radio frequency signals and the suppression of image interference. Background technique [0002] Mixers are an important part of radar receiver systems. However, there are many unavoidable mirror signals in the electronic warfare environment. Since the down-converted image signal has the same frequency as the useful IF signal, false reception may occur. To solve this problem, the receiver must provide down-conversion capability with image rejection. [0003] Traditional image rejection down-conversion techniques are generally performed in the electrical domain, using image rejection filters or image rejection mixers. Image suppression filtering uses high-Q filters to filter out image signals, and the system has high cost, complex structure,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/556
CPCH04B10/5563
Inventor 陶宇文爱军单董娟
Owner XIDIAN UNIV
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