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 accuracy, increase system complexity and uncertainty, and achieve cost savings, feasibility and The effect of improving system stability
CN102591091AActive Publication Date: 2012-07-18SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHEAST UNIV
Publication Date
2012-07-18

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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.
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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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