Phase stabilizing device for long-distance optical-fiber transmission of unknown microwave signals

Abstract

The invention discloses a phase stabilizing device for long-distance optical-fiber transmission of unknown microwave signals. The phase stabilizing device comprises a remote end, a local end and an optical fiber, wherein the remote end and the local end are connected by the optical fiber; the local end consists of a signal receiving and returning unit, a phase detecting unit and a level adjusting unit; the remote end consists of a light source 1, a mach-zehnder modulator 2 (MZM2) and a Bragg grating 3 (FBG3); the optical fiber adopts analog light transceiving link for transmitting high-frequency microwave signals. The phase stabilizing device provides a good solution for optical-fiber stable-phase transmission of the unknown microwave signals, and the microwave signals from the remote end are loaded on the light carrier by transfer to other localities and are transmitted to the local end by a single-mode optical fiber. The phase stabilizing device not only can be used for stable-phase transmission of single microwave signals, but also can be used for stable-phase transmission of multi-band microwave signals; the working is stable and the phase-stabilizing effect is relatively good in long-time measurement.

Description

technical field [0001] The invention relates to a device for phase-stable transmission of microwave signals through optical fibers in the field of passive electronic countermeasures, in particular to a device for long-distance phase-stable optical fiber transmission of microwave signals based on a phase-locked loop at the local end. Background technique [0002] Optical fiber long-distance transmission of microwave signals has a long history. It was first used in local oscillator signal distribution and atomic clock distribution design. In this type of system, a phase stabilization device is needed to keep the phase difference between the distributed microwave signal and the original signal stable. At present, the optical fiber phase-stable transmission of microwave signals has been applied to many aspects such as deep space scientific research, basic physical measurement, and multistatic radar technology. After searching the existing technical literature, the article "Ultra...

AI Technical Summary

Problems solved by technology

However, in the field of electronic countermeasures, especially with the rise and application of passive electronic countermeasures represented by passive positioning, microwave signals with unknown phases received by multiple radar antennas need to be centrally processed after long-distance optical fiber stable phase transmission. The fiber-optic phase-stabilized transmission device for multipoint distribution of microwave signals with known phase is no longer available

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