Light and small photoelectric oscillator and low phase noise microwave signal generation method based on the principle of electromagnetically induced transparency

Abstract

The invention provides a light and small photoelectric oscillator based on the electromagnetic induced transparency principle and a low phase noise microwave signal generation method. A closed photoelectric feedback loop is formed by an optical micro-cavity electromagnetic induced transparency (EIT) generation module, a laser, a polarization controller, a Mach Zehnder intensity modulator, an RF amplifier, a high-speed photodetector and a laser frequency locking module. The optical micro-cavity EIT generation module is used as a high Q value energy storage device and a narrow-band filter device. The laser generates continuous tunable laser. The polarization controller controls the polarization state of the input light. The Mach Zehnder intensity modulator performs intensity modulation on the light from the laser to generate a sideband. The RF amplifier is used for amplifying the microwave signal in the loop. The high-speed photodetector is used for converting optical signals into electrical signals. The laser frequency locking module is used for locking the pump light at the micro-cavity resonant frequency. The phase noise of the signal can be effectively reduced without the need for a traditional electric filter or an Add-drop micro-cavity coupling structure, and miniaturization is easy.

Description

technical field [0001] The invention belongs to the technical field of microwave and optoelectronics, and in particular relates to a light and small photoelectric oscillator based on the principle of electromagnetically induced transparency and a method for generating microwave signals with high spectral purity. Background technique [0002] As the most basic and core components in modern electronic systems, small-scale high-spectrum-purity microwave oscillation signal sources are widely used in many fields such as radar, wireless communication, radio astronomy, satellite, GPS navigation, and instrument measurement. With the development of radar, satellite communication, electronic countermeasures, etc. to higher frequency bands, the electronic system has higher and higher requirements for the frequency coverage, phase noise performance and integration of the oscillator. For example, for military digital array radar systems, the phase noise of the oscillation source has grad...

AI Technical Summary

Problems solved by technology

However, traditional optoelectronic oscillators require narrow-band electrical filters, double-coupled tapered fibers, or double-coupled prisms and other bulky structures as narrow-band filter elements, and the practical application environment of small and low-noise optoelectronic oscillations puts forward special requirements for optoelectronic oscillations of WGM microcavities. : 1) The bandwidth and transmittance of the resonance spectrum of the WGM microcavity can be stably and finely tuned to regulate the spectral purity and phase noise performance of the oscillation system; 2) The narrow-band filtering is no longer based on the bulky long optical fiber or Add-drop structure, Facilitate its miniaturization and integration

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