Ultra narrow linewidth tunable microwave signal source

A microwave signal source, ultra-narrow linewidth technology, applied in solid-state lasers and other directions, can solve the problems of complex system, high cost, high noise, etc., and achieve the effect of reducing volume, easy packaging, and reducing use cost

Inactive Publication Date: 2014-06-18
CHANGCHUN UNIV OF SCI & TECH
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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 prio

Method used

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  • Ultra narrow linewidth tunable microwave signal source
  • Ultra narrow linewidth tunable microwave signal source
  • Ultra narrow linewidth tunable microwave signal source

Examples

Experimental program
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Embodiment

[0038] Embodiment: Take the realization of the beat frequency of microwave signals from 10 GHz to 40 GHz as an example.

[0039] Realize 10GHz microwave signal: first adjust the adjustable narrow-linewidth Brillouin pump laser 16, so that the wavelength of the pump laser is far away from the central wavelength of the fiber Bragg grating to prevent it from being filtered; secondly, adjust the polarization controller 19 to realize output Stokes The number of lights is 1. At this time, the pump light and the first Stokes light are output by the second three-port coupler 25, such as image 3 a. The resulting beat frequency is a 10GHz microwave signal, such as Figure 4 a.

[0040] Realize 20GHz microwave signal: first adjust the adjustable narrow linewidth Brillouin pump laser 16, so that the wavelength of the pump laser is far away from the central wavelength of the fiber Bragg grating to prevent it from being filtered; secondly, adjust the polarization controller 19 to realiz...

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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 ...

Claims

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Application Information

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IPC IPC(8): H01S1/02
Inventor 张鹏王天枢董科研贾青松孙宏伟姜会林
Owner CHANGCHUN UNIV OF SCI & TECH
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