Self-adaptive polarization mode optical dispersion compensation method
A technology of polarization mode dispersion and compensation method, which is applied in the direction of eliminating distortion/dispersion, electromagnetic wave transmission system, optical fiber transmission, etc., and can solve the problems of poor search accuracy and slow response speed.
Inactive Publication Date: 2013-10-30
LIAOCHENG UNIV
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[0007] The technical problem to be solved by the present invention is to provide an adaptive polarization mode dispersion compensation method to reduce the polarization mode The implementation difficulty of dispersion compensation algorithm is convenient, effective and fast for adaptive polarization mode dispersion compensation in optical fiber communication
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[0050] The artificial fish swarm method is a new behavior-based artificial intelligence algorithm proposed by Dr. Li Xiaolei in my country in 2002. In a water area, fish can often find a place with a lot of nutrients by itself or by following other fish. Therefore, the place where the number of fish survives is generally the place with the most nutrients in the water area. The artificial fish school method is based on this characteristic. Artificial fish is used to imitate the behaviors of foraging, flocking and tail-tracking of fish schools, so as to achieve optimization. The following are some typical behaviors of fish:
[0051] (1) Foraging behavior: Under normal circumstances, fish swim freely in the water randomly, and when they find food, they will quickly swim towards the direction where the food gradually increases.
[0052] (2) Grouping behavior: Fish will naturally gather in groups in order to ensure their own survival and avoid harm during swimming. There are three ...
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The invention discloses a self-adaptive polarization mode optical dispersion compensation method, comprising the following steps: arranging a PMD (polarization mode dispersion) compensation unit and a signal monitoring unit on an optical fiber link between an optical sending device and an optical receiving device, and arranging a processing unit outside the optical fiber link between the optical sending device and the optical receiving device; monitoring optical signals by the signal monitoring unit, and outputting a stokes parameter of PMD in the optical fiber link according to a monitoring result; carrying out processing by using an artificial fish-swarm algorithm according to the stokes parameter which is output by the signal monitoring unit by the processing unit, and outputting a control voltage according to the process result; and carrying out compensation to polarization mode optical dispersion in the optical fiber link according to the control voltage which is output by the processing unit by the PMD compensation unit. The self-adaptive polarization mode optical dispersion compensation method has strong capacity of overcoming local extreme values, the optimizing precision is high, the compensation effect is good, the tracking speed is high, the difficulty for realizing a polarization mode optical dispersion compensation algorithm can be reduced, and the real-time compensation requirement of the PMD is met.
Description
technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to an adaptive polarization mode dispersion compensation method. Background technique [0002] Single-mode optical fibers used in communication systems are affected by geometric deformations that occur during factory drawing, or by extrusion, bending, torsion, and external electric fields, magnetic fields, and temperatures, all of which will cause the refractive index of the fiber core to vary between Anisotropic distribution occurs on the cross-section of the fiber, and uneven distribution occurs in the axial direction of the fiber, resulting in inconsistent polarization mode group velocities in two mutually perpendicular directions, which eventually causes the optical pulse at the output end of the fiber to broaden or split. It is called Polarization Mode Dispersion (PMD for short). For high-speed optical fiber communication systems with a capacity of 40Gbit / s...
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IPC IPC(8): H04B10/2507H04B10/25H04B10/2569
Inventor 白成林许恒迎孙伟斌张霞
Owner LIAOCHENG UNIV