Distributed Sensing System Based on Delayed Pulse Raman Amplification

A Raman amplification and sensing system technology, applied in the direction of using optical devices to transmit sensing components, can solve problems such as limiting sensing distance, reducing signal-to-noise ratio, modulation instability, etc., to extend sensing distance, nonlinear The cumulative effect is small, the effect of reducing the impact

Active Publication Date: 2016-08-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

In order to extend the sensing distance and improve the sensitivity, the existing distributed sensing system generally adopts the method of increasing the Raman pump power, but simply increasing the Raman pump power may easily cause abnormalities such as self-phase modulation and modulation instability. The generation of linear effect, which reduces the signal-to-noise ratio and limits the sensing distance

Method used

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  • Distributed Sensing System Based on Delayed Pulse Raman Amplification
  • Distributed Sensing System Based on Delayed Pulse Raman Amplification
  • Distributed Sensing System Based on Delayed Pulse Raman Amplification

Examples

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Embodiment

[0034] In order to illustrate the nonlinear effect caused by increasing the pump power more specifically, take a 50km G.652 optical fiber as an example. Because pulses of different wavelengths are transmitted at different speeds in the fiber, the 1550nm probe light and the 1455nm pump light have a group velocity mismatch. This characteristic leads to the walk-off phenomenon. The dispersion parameter is: Therefore, for the faster pump pulse to interact with the slower probe pulse, it is necessary to ensure that there is a certain delay in the pump pulse. Taking the time delay of 10ns as an example, the pump pulse will undergo stimulated Raman scattering with the detection pulse at 10km, thereby amplifying the detection optical signal. Such as figure 2 Shown is a schematic diagram of the interaction of the pump pulse with the amount of time delay with the probe pulse.

[0035]In order to further illustrate that the distributed sensing system based on delayed pulse Raman ampl...

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Abstract

The invention discloses a distributed sensing system based on delayed pulse Raman amplification, which comprises a narrow linewidth light source, a Raman pumping light source, a first modulation module connected to the narrow linewidth light source, and a Raman pumping light source The second modulation module, the first modulation module is connected to the wavelength division multiplexer through the erbium-doped fiber amplifier and the circulator in turn, the second modulation module is directly connected to the wavelength division multiplexer, and the wavelength division multiplexer The circulator is connected to the sensing fiber, the first modulation module is connected to the second modulation module through a signal generator, and the circulator is sequentially connected to the detector, the data acquisition module and the computer through a filter. The invention realizes longer effective sensing distance of detection light by means of pulse modulation pumped Raman amplification with a certain time delay.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a distributed sensing system based on time-delayed pulse Raman amplification. Background technique [0002] With the development of society, people's dependence on information is becoming more and more serious, and the demand for information transmission is rapidly expanding. The capacity of existing optical fiber systems has been greatly increased, and the simple transmission distance of non-electric regenerative relay has been increased. hot spot. In this context, Raman amplifiers have attracted extensive attention due to their inherent low-noise and wide-bandwidth characteristics. [0003] The so-called Raman amplification is to transfer a part of the incident light power to the Stokes wave with a lower frequency than it. If a weak signal wave and a strong pump light wave are transmitted in the optical fiber at the same time, and the weak signal wavelength is pl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/36
Inventor 王子南黎进范孟秋饶云江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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