High non-linear optical fiber excited Brillouin scattering effect and amplitude ratio based microwave frequency measurement method and device

A high nonlinear optical fiber, microwave frequency measurement technology, applied in the field of microwave photonics, can solve problems such as the inability to meet measurement requirements

Active Publication Date: 2017-09-08
JILIN UNIV
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Problems solved by technology

Due to the inherent electronic bottleneck problem of electrical technology, traditional electrical microwave frequency measurement techno...

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  • High non-linear optical fiber excited Brillouin scattering effect and amplitude ratio based microwave frequency measurement method and device
  • High non-linear optical fiber excited Brillouin scattering effect and amplitude ratio based microwave frequency measurement method and device
  • High non-linear optical fiber excited Brillouin scattering effect and amplitude ratio based microwave frequency measurement method and device

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Embodiment 1

[0024] Embodiment 1: the tunable laser is the TSL-510 tunable laser of Santec Company, and the wavelength range of the laser is 1510nm~1630nm; the coupler is a 5:5 coupler; the intensity modulator adopts a Mach-Zehnder modulator, and the bandwidth is 32GHz, the minimum operating point bias voltage measured before the experiment is 6.7V; the bandwidth of the phase modulator is 40GHz; the isolation of the optical isolator is greater than 40dB; the erbium-doped fiber amplifier is WZEDFA-SO-B-S-17-1-2; the default Constant power output 17dBm. YOFC’s highly nonlinear optical fiber has a length of 1km. When the optical carrier wavelength is 1550nm, under the same experimental conditions as the microwave frequency measurement experiment, the measured linewidth of the stimulated Brillouin gain spectrum is measured as ΔV B =100MHz, stimulated Brillouin frequency shift f B =9.2GHz; Agilent’s microwave signal generator E8257D, the output frequency range is 100kHz to 70GHz; the bandwidth...

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Abstract

The invention provides a high non-linear optical fiber excited Brillouin scattering effect and amplitude ratio based microwave frequency measurement method and device and belongs to the technical field of microwave photonics. The device provided by the invention is composed of a tunable laser, a coupler, a phase modulator, a strength modulator, a vector network analyzer, an opto-isolator, a high non-linear optical fiber, a circulator, an erbium-doped optical fiber amplifier, a microwave signal source, a DC voltage stabilizing power source and a photoelectric detector. The frequency range of to-be-detected microwave signals can be enlarged through increasing bandwidths of the strength modulator and the phase modulator and enlarging the scanning range of the vector network analyzer and measurement precision can be improved through reducing noise in optical links and increasing the magnitude of energy transfer of excited Brillouin scattering effect. According to the invention, an amplitude ratio function curve is constructed based on the high non-linear optical fiber excited Brillouin scattering effect and a frequency value of to-be-detected microwave signals is obtained through the amplitude ratio function curve. Therefore, the measurement precision is improved.

Description

technical field [0001] The invention belongs to the technical field of microwave photonics, and in particular relates to a microwave frequency measurement method and device based on highly nonlinear optical fiber stimulated Brillouin scattering effect and amplitude ratio. Background technique [0002] Microwave frequency measurement technology is widely used in communication, navigation, radar, electronic warfare and other systems, and plays an extremely important role. Due to the inherent electronic bottleneck problem of electrical technology, traditional electrical microwave frequency measurement technology is gradually unable to meet the measurement requirements of modern wide bandwidth, high frequency range, high precision, and transient environment. Microwave photonics combines photonics theory and microwave theory, and takes into account the advantages of microwave and photonics. Microwave frequency measurement technology based on microwave photonics has low loss, larg...

Claims

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Application Information

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IPC IPC(8): G01R23/02
CPCG01R23/02
Inventor 董玮潘林兵张歆东
Owner JILIN UNIV
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