Optical generation method of double-frequency-band and multi-phase phase coded signal with adjustable frequency multiplication factor

Abstract

The invention discloses an optical generation method of a double-frequency-band and multi-phase phase coded signal with an adjustable frequency multiplication factor, and relates to the technical fields of microwaves and optical communication. The method is as shown in figure 1 in the specification, and a laser LD, a dual-polarization quadrature phase shift keying DP-QPSK modulator, a polarizationmodulator PolM, a polarization controller PC, a polarization beam splitter PBS and a balance photoelectric detector BPD are included. A local oscillator signal is used to modulate an optical carrierthrough theDP-QPSK modulator, and after thePC is regulated, one sideband and the polarization state of the optical carrier are mutually orthogonal with the polarization state of the other sideband, two arms of thePolMare entered respectively and subjected to phase modulation opposite to a phase encoding signal; and the second PC is regulated, and a phase encoding signal is output after photoelectric balance detection. According to the invention, dual-band and multi-phase phase coded signals can be generated at the same time, and the frequency multiplication factor is adjustable. Not only is anelectronic bottleneck of an electric domain technology overcome, but also the working bandwidth is expanded, and a potential application value in a dual-band radar is achieved.

Description

technical field [0001] The invention relates to the field of optical communication technology and the field of microwave technology, and mainly relates to the generation of phase encoding signals by using photonics technology. Background technique [0002] With the continuous development of radar detection technology, its detection accuracy and detection distance need to be further improved. The larger the detection signal bandwidth, the higher the radar detection resolution; the larger the time width, the higher the velocity resolution. In order to meet the requirements of large bandwidth and large duration at the same time, pulse compression signal came into being. Commonly used pulse compression signals include linear frequency modulation and phase-coded signals, and phase-coded signals are widely used because of their easy generation and good pulse compression performance. Although the technology of using electronic technology to generate phase-encoded signals is very ...

AI Technical Summary

Problems solved by technology

In the first scheme, although the system is flexible and scalable, the coupling of free space and fiber will increase the loss and complexity of the system

In the second scheme, there is no need for spatial light processing, and the system will be more stable; using the flexible modulation mode and variable system structure of the electro-optic modulator, various frequency multiplication factors can be designed, or any system can be designed. Phase encoding signal; however, most of the schemes have a single function and can only generate one phase encoding signal at the same time, which is difficult to apply in dual-band radar, frequency diversity radar and other systems

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