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Method and system for generating photon microwave signal with stable phase

A photonic microwave and signal generation technology, applied in radio wave measurement systems, optics, nonlinear optics, etc., can solve problems such as insufficient stability, increased system complexity and uncertainty, and achieve cost savings, feasibility and The effect of system stability improvement

Active Publication Date: 2014-12-10
SOUTHEAST UNIV
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Problems solved by technology

However, in the traditional non-coherent method, the phase difference between the reference signal and the transmission signal is performed in the electrical domain after photoelectric conversion, which increases the complexity and uncertainty of the system, and the stability accuracy is not high enough.

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  • Method and system for generating photon microwave signal with stable phase
  • Method and system for generating photon microwave signal with stable phase
  • Method and system for generating photon microwave signal with stable phase

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the purpose and effect of the present invention will become more obvious.

[0017] Such as figure 1 As shown, the microwave-photonic phase-shifting link system can be divided into four modules: photonic microwave signal generation module, photonic microwave signal phase-shifting module, photonic microwave signal phase-shifting feedback control module, and photonic microwave phase-shifting signal receiving module. (2) and (3) if figure 2 shown are interrelated.

[0018] A system for polarization coherent light interference feedback to stabilize the phase of microwave signals, such as figure 2 As shown, including: distributed feedback (DFB) laser 1, polarization beam splitter 2, acousto-optic frequency shifter 3, 25MHz signal generator 4, polarization beam combiner 5, RF signal generator (10GHZ) 6, Mach Zehnder modulator 7, photonic microwave signa...

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Abstract

The invention relates to a method and a system for improving phase stability of a photon microwave signal. The method comprises the following steps that: light output by a laser device is divided into two beams of vertical polarized light by a polarized light beam splitter; a reference light is combined with transmission light via a polarized light beam combiner after frequency-shift, and passes through the polarized light beam splitter after passing through a light micro-wave modulation and a light delay link, finally the reference light is interfered by the transmission light after being rotated and polarized by a faraday rotation mirror, and then a beat frequency signal is detected through a low-speed photodetector; the beat frequency signal is subjected to phase comparison with a 25MHz reference signal to obtain a phase disturbance situation of a transmission system, and the signal output by a phase discriminator is used as a control signal of a microwave photonic phase shifter after being processed. The system comprises a DFB (distributed feedback) laser device, the polarized light beam splitter, an acoustooptic frequency shifter, the polarized light beam combiner, an RF (radio frequency) signal generator, a Mach-Zehnder modulator, the photon microwave signal phase shifter, the polarized light beam splitter, an optical interferometer, a low-frequency optical receiver phase discriminator and a proportion integrator.

Description

technical field [0001] The invention relates to a method for improving the phase stability of photon microwave signals, in particular to improving the phase stability of microwave signals through the interference feedback of two beams of polarized light. Background technique [0002] The phase stabilization technology of the phase-shifted microwave signal in the optically controlled phased array radar system is one of the key factors affecting the measurement accuracy of the optically controlled phased array radar system. way. [0003] Optically controlled phased array radar is the application of optoelectronic technology in phased array radar to transmit and distribute radar signals and control signals to realize optical beam control. Compared with the previous phased array radar, the optically controlled phased array radar has been effectively improved in terms of size, weight, transmission loss, radiation interference and other issues; the optical delay line can be used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/35G02F1/225G01S7/02
Inventor 陈翰孙明明孙小菡
Owner SOUTHEAST UNIV
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