Optical generation method of dual-band phase-coded signal

Abstract

The invention discloses an optical generation method of a dual-band phase-coded signal, and relates to the technical field of microwaves and the technical field of optical communication. The method is shown in a figure 1 in the specification, and comprises a laser device LD, a dual-polarization quadrature phase shift keying modulator DP-QPSK, a polarization controller PC, a polarization beam splitter PBS and a balanced photoelectric detector BPD. A baseband phase coded signal is modulated to an optical carrier through an X-DPMZM in the DP-QPSK, and a local oscillator signal generates positive and negative first-order optical sidebands through a Y-DPMZM in the DP-QPSK; the PC is adjusted, the included angle between the polarization state of the DP-QPSK output optical signal and the PBS main shaft is controlled, and then a phase coding signal can be obtained after photoelectric balance detection. According to the invention, dual-band phase-coded signals can be simultaneously generated. Not only is the electronic bottleneck of the electric field technology overcome, but also the working bandwidth is expanded; and due to the dual-band characteristic, the system has potential application value in a dual-band radar.

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 increase of frequency bands for radio applications, radar systems are developing towards ultra-wideband, reconfigurable and multi-band. Pulse radar is a common type of radar. 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 further improve the detection accuracy and distance of the radar system, it is necessary to study the pulse compression signal that generates a larger time-width bandwidth, and the phase-encoded signal has been widely used because of its easy generation and good pulse compression performance. Although the technology of using electronic technology to generate phase-encoded signals is ...

AI Technical Summary

Problems solved by technology

In the first type of solution, although the system is flexible and scalable, the spatial modulator is bulky, and the coupling of free space light and optical fiber will make the system structure complex and increase the loss

In the second type of scheme, various signals with adjustable multiplication factors can be designed by using the flexible modulation mode and variable system structure of the electro-optic modulator. However, most schemes can only generate phase-encoded signals in one frequency band. Some also require cascaded modulators to make the system complex and difficult to apply to dual-band radar, frequency diversity radar and other systems

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