Ultra-Narrow Linewidth Tunable Microwave Signal Source

Abstract

An ultra narrow linewidth tunable microwave signal source belongs to the field of photoelectron and microwave photonics and aims to solve problems of wide linewidth, high noise, complex system and high cost of a microwave signal source. The ultra narrow linewidth tunable microwave signal source is characterized in that pump light is output from an adjustable narrow linewidth Brillouin pump laser; the pump light is amplified by an Er-doped optical fiber amplifier; after passing a first three-port coupler, most pump light enters a four-port coupler by a polarization controller and a circulator; small part of the pump light achieves a second three-port coupler by a variable optical attenuator; one part, entering the four-port coupler, of the pump light enters a high non-linear optical fiber to excite first-order stokes light in the opposite direction while the other part is output from the port subjected to oblique angle processing; the odd number-order stokes light achieves the second three-port coupler by the circulator and an optical fiber bragg grating; the obtained dual-wavelength laser achieves a photoelectric detector by the second three-port coupler to carry out beat frequency to obtain a narrow linewidth high-frequency microwave signal and the signal is measured by an electric spectrometer.

Description

technical field [0001] The invention belongs to the field of optoelectronics and microwave photonics, and in particular relates to a microwave signal source based on a double Brillouin frequency shift interval single-frequency fiber laser. The invention is applied in the field of wireless communication. Background technique [0002] With the rapid development of information technology, the communication industry has developed rapidly. Devices that generate microwave signals based on optical methods have important applications in wireless communication, radio over fiber (ROF) and other fields due to their advantages such as simple structure, high frequency, and full use of optical fiber devices. Traditional methods of optical generation of microwave signals include: injection-locked, phase-locked lasers, multi-wavelength Brillouin lasers, dual-wavelength fiber lasers, and optical modulation. The above methods have bottlenecks in terms of high frequency, tunability, and high ...

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems of wide line width, high noise, complex system and high cost existing in microwave signal sources based on Brillouin lasers in the prior art, the present invention proposes a single-frequency fiber laser based on double Brillouin frequency shift spacing Ultra-Narrow Linewidth Tunable Microwave Signal Source

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