Sensing wavelength demodulation scheme based on microwave power detection

A microwave power and wavelength demodulation technology, applied in the field of optical sensor demodulation and microwave photonics, to achieve the effect of facilitating engineering practicality, improving flexibility and convenient demodulation range

Inactive Publication Date: 2010-04-14
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the use of the microwave power attenuation effect caused by dispersion to achieve sensing wavelength demodulation has not been reported. Therefore, we propose to use the microwave power attenuation effect caused by dispersion to develop a new sensing wavelength demodulation scheme

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  • Sensing wavelength demodulation scheme based on microwave power detection
  • Sensing wavelength demodulation scheme based on microwave power detection
  • Sensing wavelength demodulation scheme based on microwave power detection

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Embodiment Construction

[0012] The implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0013] Such as figure 1 As shown, the present invention consists of an intensity modulator 10, a microwave source 11, a coupler 12, a dispersion element 13, a tuned optical attenuator 14, a first photodetector 15, a second photodetector 16, a first microwave power meter 17 , a second microwave power meter 18, and a power comparison module 19.

[0014] exist figure 1 , the optical signal with the wavelength λ to be measured is input into the intensity modulator 10 . Microwave source 11 generates a frequency f m The sinusoidal microwave signal is applied to the intensity modulator 10 to perform small signal modulation on the input optical signal to obtain two optical sidebands and an optical carrier. The modulated optical signal is input into the coupler 12 and divided into two parts, which are respectively input into the first branch composed o...

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Abstract

The invention discloses a sensing wavelength demodulation scheme based on microwave power detection. A light signal with a wavelength to be measured is injected in a strength modulator and is modulated by a sinusoidal microwave signal under a small signal modulation condition; the modulated light signal is divided equally into two paths for transmission, wherein a first path light signal introduces microwave power attenuation effect caused by dispersion by a dispersion element, and a second path does not introduce dispersion; the light signal passes through a tuning light attenuator to balance the light power loss of the two paths; then, the two microwave powers of the two paths are detected by a photoelectric detector and a microwave power meter and inputted to a power comparison module at the same time to acquire a corresponding relation of a microwave power ratio and a wavelength to be measured, thus the wavelength to be measured is demodulated. The invention demodulates a momentary wavelength, is not influenced by the power fluctuation of an input light signal and has flexibly adjusted demodulation precision and demodulation range.

Description

technical field [0001] The invention relates to the fields of optical sensing demodulation and microwave photonics, in particular to a sensing wavelength demodulation scheme based on microwave power detection. Background technique [0002] Optical wavelength-based sensing technology has gradually become a hot spot in engineering applications due to its advantages in wavelength coding. One of the key links is the wavelength demodulation scheme, such as the reported filter demodulation, interference demodulation, and tunable scanning light source demodulation. and other typical methods. The wavelength demodulation method using microwave signal detection has been initially reported (Xinyong Dong, Liyang Shao, H.Y.Fu, H.Y.Tam, and C.Lu, Intensity-modulated fiber Bragg grating sensorsystem based on radio-frequency signal measurement, Optics Letters, vol .33, pp.482-484, 2008), and showed the advantages of high-speed demodulation and adjustable sensitivity, but the demodulation r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J9/00
Inventor 邹喜华潘炜闫连山罗斌
Owner SOUTHWEST JIAOTONG UNIV
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