Highly-stable single-mode microwave optoelectronic oscillator

Abstract

The invention discloses a highly-stable single-mode microwave optoelectronic oscillator. A modulator B (5) is arranged in an optoelectronic oscillator (OEO) loop and driven by a highly-stable microwave source (12), output modes of the oscillator can be chosen through a modulation mode locking process, and edge mode noise is inhibited through gain competition between the modes. Simultaneously a phase-locked loop theory is used for comparing output signals of the OEO with output signals of the highly-stable microwave source (12), a phase (or cavity length of the OEC) for controlling the output signals of the OEO is fed back, and finally stable single-mode OEO output is obtained. The highly-stable single-mode microwave optoelectronic oscillator can achieve frequency stabilization phase lock and single-mode operation of the OEO simultaneously, is simple in structure and low in cost, and has practical value.

Description

technical field [0001] The invention relates to the fields of microwave technology and optoelectronic technology, in particular to a photoelectric oscillator. [0002] Background technique [0003] An optoelectronic oscillator (OEO: Optoelectronic Oscillator) is an optical and electrical microwave / millimeter wave signal generating device. Its basic structure is to use a feedback loop composed of a light source, an electro-optic modulator, a photodetector, and an electric filter, and use the energy storage capacity of a long optical fiber to generate high-quality optical and electrical microwave signals. At present, the OEO system has some disadvantages due to its structural characteristics, which are mainly manifested in: the long optical fiber can store more light field energy in the loop and improve the quality of the generated signal, but this also brings about a large system size. , vulnerable to the external environment, making the output frequency unstable shortcomin...

AI Technical Summary

Problems solved by technology

The multi-loop structure is complex and requires the use of long optical fibers, which makes the entire OEO system bulky. When using phase-locked loop technology to lock the starting frequency, it is theoretically necessary to adopt phase-locked control for each loop, which greatly increases the Cost and System Complexity

In addition, the multi-loop structure can only increase the side touch interval of the oscillator to a certain extent. Only when the number of loops is large can the single-mode start-up of OEO be effectively guaranteed;

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