Method and device for compensating adaptive dispersion
A dispersion compensation and self-adaptive technology, applied in the direction of eliminating distortion/dispersion, optical fiber transmission, electrical components, etc., can solve the problems of inability to judge and remove local optimum points, inaccurate overall compensation, slow speed, etc., and achieve good application prospects and use value, improve the speed and accuracy of dispersion search, and eliminate the effect of local optimum
Active Publication Date: 2014-02-05
ZTE CORP
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[0002] During WDM long-distance transmission, due to various factors such as the environment, optical fiber, and equipment, the system produces dispersion effects. Although each transmission site will use part of the dispersion compensation technology to improve, the overall compensation is not accurate. For high-speed optical transmission Channel equipment, such as single-wavelength 40G or 100G equipment, cannot work without special dispersion compensation equipment, so equipment with dispersion compensation function is essential
[0003] Although the traditional dispersion compensation equipment can compensate the access residual dispersion of the system transmission, the method adopted cannot adapt to the complex changes of the system. For example, some dispersion compensation units only support manual setting, and the dispersion range of the site needs to be calculated manually, and Try to set it manually within this range; although some dispersion compensation units support automatic dispersion search compensation, but because they do not know the specific characteristics of the system, they can only set a fixed search step, which is very slow, and it is impossible to judge and remove the local optimum
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[0043] The dispersion compensation of the actual system has a certain tolerance, that is, the compensation value within this range can make the receiving device recognize the transmission signal, but the signal quality difference within this range is very large, except for the need to find the signal that can recognize the signal. Outside the area, it is also necessary to find the dispersion compensation value that makes the system transmission performance the best in this area, and when the system changes, this range and the optimal value also change, and it is necessary to be able to keep track of this optimal dispersion compensation value at all times. These are Optimum requirements for system dispersion compensation. The search basis for the dispersion compensation tolerance is that the error count before error correction is invalid (the count is invalid including OTU (Optical transmit unit, optical transmit unit) frame loss, uncorrectable frames, etc.), and the basis for j...
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A method and an apparatus for adaptive dispersion compensation is provided by the present invention, and the method comprises: a main control module controls a dispersion adjustment module to perform dispersion coarse adjusting and detects the bit error before correction, if the bit error before correction counting is valid, then sets the current dispersion value as the initial dispersion value and controls the dispersion adjustment module to perform the dispersion fine adjustment; when the main control module controls the dispersion adjustment module to perform dispersion fine adjustment, it takes initial dispersion value as the center, searches the scope of the bit error before correction counting being valid, sets the dispersion value corresponding to the minimum bit error rate before correction as a better dispersion value, then controls the dispersion adjustment module to perform dispersion optimization; and when the main control module controls the dispersion adjustment module to perform the dispersion optimization, it takes the better dispersion value as the center, obtains one or more dispersion values from both sides respectively, detects the corresponding bit error rate before correction, sets the detected dispersion value corresponding to the minimum bit error rate before correction as a new better dispersion value, and further performs dispersion optimization until reaches the predetermined condition of the termination of the optimization, sets the current better dispersion value as the optimum dispersion value, and controls the dispersion adjustment module to keep the dispersion. The present invention can tracks the change of the system dispersion and makes adjustment automatically, which improves the performance of optical channel access equipments and the anti-interference ability of wavelength-division systems.
Description
technical field [0001] The invention relates to the field of wavelength division communication, in particular to a method and device for adaptive dispersion compensation. Background technique [0002] During WDM long-distance transmission, due to various factors such as the environment, optical fiber, and equipment, the system produces dispersion effects. Although each transmission site will use part of the dispersion compensation technology to improve, the overall compensation is not accurate. For high-speed optical transmission Channel equipment, such as single-wavelength 40G or 100G equipment, cannot work without special dispersion compensation equipment, so equipment with dispersion compensation function is essential. [0003] Although the traditional dispersion compensation equipment can compensate the access residual dispersion of the system transmission, the method adopted cannot adapt to the complex changes of the system. For example, some dispersion compensation uni...
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IPC IPC(8): H04B10/2507H04B10/2513
CPCH04B10/25133
Inventor 田野李新兵蔡鸿鹏赵祖慧
Owner ZTE CORP