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Real-time spectrum analysis device and method of fiber bragg grating

A real-time spectrum analysis and fiber Bragg grating technology, applied in the field of femtosecond optics, can solve the problems that are not suitable for FBG spectrum fast and large dynamic range measurement, and achieve the effect of fast analysis and large dynamic range

Inactive Publication Date: 2013-01-02
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

This method is very sensitive to signal intensity fluctuations caused by laser light sources and environmental changes, so it is not suitable for fast and large dynamic range measurements of FBG spectra

Method used

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  • Real-time spectrum analysis device and method of fiber bragg grating
  • Real-time spectrum analysis device and method of fiber bragg grating
  • Real-time spectrum analysis device and method of fiber bragg grating

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Embodiment Construction

[0033] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to specific embodiments and drawings.

[0034] figure 1 It is the structural principle diagram of the fiber grating real-time spectrum analysis device of the present invention, such as figure 1 As shown, according to one aspect of the present invention, a fiber grating real-time spectrum analysis device is provided, which includes a light source module 1, a sensing unit 2, a dispersion unit 3, a recording module 4, and a unit to be tested, wherein:

[0035] The light source module 1 is used to transmit pulses, and further includes a femtosecond laser 5 and an optical attenuator 6. The femtosecond laser 5 is used to emit femtosecond laser pulses for grating spectrum analysis, and the optical attenuator 6 is used to attenuate the intensity of the femtosecond laser pulses to avoid the high peak power...

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Abstract

The invention discloses a real-time spectrum analysis device and a method of a fiber bragg grating. The device comprises a light source module, a sensing unit, a chromatic dispersion unit, a recording module and a to-be-tested unit. The method comprises the following steps of obtaining a 'frequency-time mapping' relation by using the light source module, the sensing unit, the chromatic dispersion unit and the recording module; replacing the sensing unit with the to-be-tested unit; collecting and obtaining a time-domain impulse signal by adopting the light source module, the to-be-tested unit, the chromatic dispersion unit and the recording module; and converting the time-domain impulse signal into a frequency domain signal by the 'frequency-time mapping' relation, so as to achieve ultra-fast spectrum analysis on the FBG (fiber bragg grating). The speed that an oscilloscope collects the time-domain signal is higher than the speed that a spectrograph is directly adopted for measuring a spectral line, so that rapid analysis on the spectrum can be achieved. Meanwhile, a femtosecond laser pulse is utilized as a light source, so that a large dynamic measurement range can be achieved.

Description

Technical field [0001] The invention relates to the technical field of femtosecond optics, in particular to a fiber grating real-time spectrum analysis device and method. Background technique [0002] The existing fiber Bragg grating (FBG) spectrum analysis technology is mainly divided into three categories: [0003] The first category: Use a static discriminator to convert the frequency of the FBG signal into a signal strength change or spatial distribution of the strength: such as the FBG signal on the edge discriminator (Fabry-Perot etalon or wavelength division multiplexing optical fiber device) Transmittance changes, or changes in the intensity distribution of the FBG signal on a charge-coupled device (CCD) after passing through a dispersive device. In edge technology, measurement accuracy and dynamic range are mutually restricted and cannot be improved at the same time. At present, the working wavelength of high-speed CCD is limited to below 900nm, which makes the instrumen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/28
Inventor 夏海云胡冬冬孙东松窦贤康舒志峰薛向辉
Owner UNIV OF SCI & TECH OF CHINA
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