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Raman gain real time kinetic control and compensation method and its Raman optical-fibre amplifier

A fiber amplifier and Raman amplifier technology, which is applied in the field of Raman gain real-time dynamic control and compensation, and Raman gain locking, can solve the problems of increasing fiber loss coefficient and decreasing Raman gain, etc. Achieving the effect of small change in Raman gain

Inactive Publication Date: 2003-04-23
GUANGXUN SCI & TECH WUHAN
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  • Abstract
  • Description
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Problems solved by technology

However, in the practical application of distributed Raman fiber amplifiers, considering the influence of factors such as the aging of the fiber over time and the change of the ambient temperature, the loss coefficient of the fiber will increase, thereby reducing the Raman gain.

Method used

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  • Raman gain real time kinetic control and compensation method and its Raman optical-fibre amplifier
  • Raman gain real time kinetic control and compensation method and its Raman optical-fibre amplifier
  • Raman gain real time kinetic control and compensation method and its Raman optical-fibre amplifier

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Embodiment approach 1

[0039] Implementation mode 1 such as figure 2 : According to the optical path structure we designed, only by measuring the backward ASE power of the points near the three signal wavelengths (but not coincident with the signal frequency), the automatic control of the Raman gain of the Raman amplifier in the entire amplification bandwidth can be realized. And compensation. Bandpass filter 1 is used to detect the ASE optical power within a certain bandwidth with a center frequency of ν1; Bandpass filter 2 is used to detect ASE optical power within a certain bandwidth with a center frequency of ν2; Bandpass filter 3 is used to detect The center frequency is ν3, the ASE optical power within a certain bandwidth. The center frequency and bandwidth of the band-pass filter are not fixed, as long as it is not the ITU-T frequency, and it should be specifically designed according to specific conditions.

Embodiment approach 2

[0040] Implementation mode 2 such as image 3 :Through the combination of tunable optical filter and optical detector, it is used to detect the backward ASE power of Raman fiber amplifier at different frequencies.

[0041]According to the detected ASE power level, the Raman amplifier calculates the Raman gain of each point through the control unit, and automatically adjusts its pumping power level to keep the power of the ASE at each point at the required level, thereby achieving the Raman amplifier gain Real-time dynamic adjustment and control.

[0042] From theoretical derivation and experimental results, it can be known that when the ASE power at each point is constant, the Raman gain at that point is uniquely determined, so it is easy to automatically adjust the power of the pump laser through the control unit of the Raman amplifier Keep the ASE optical power at the corresponding center frequency unchanged or change in a small range, so as to realize the automatic control and ...

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Abstract

The present invention mainly utilizes the spontaneous raidation noise of backward pump, i.e. light power level of ASE to implement autoamtic control of Raman gain of Raman optical-fibre amplifier andcompensation. Its Raman optical-fibre amplifier is characterized by that at the signal light detection place a combination of filter and photoelectric detector for detecting the backward ASE power ofRaman optical fibre amplifier nearby dirrerent wavelength is added, the output of the photoelectric detector is connected with control unit of automatic regulation of gain of Raman amplifier.

Description

Technical field [0001] The invention relates to a method for real-time dynamic control and compensation of Raman gain and a Raman fiber amplifier, in particular to the optical path structure design of the Raman fiber amplifier in the field of optical communication and the Raman gain locking of the amplifier. Background technique [0002] If a weak signal and a strong pump light wave are simultaneously transmitted in the fiber, and the weak signal wavelength is placed within the Raman gain bandwidth of the pump light, the weak signal light can be amplified. This is based on the stimulated Raman scattering mechanism The optical amplifier is called Raman fiber amplifier. The gain spectrum of the Raman fiber amplifier is determined by the wavelength of the pump laser and the characteristics of the fiber. Under the condition of a single pump wavelength of 1455nm, the basic shape of the Raman gain spectrum in G.652, G.655 (Leaf) and DCF fibers is as follows figure 1 Shown. It can be s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/39H01S3/30
Inventor 印新达付成鹏
Owner GUANGXUN SCI & TECH WUHAN
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