PMD suppression device for high speed optical communication system and optical communication system

Abstract

The invention discloses a PMD suppression device for a high speed optical communication system and an optical communication system. The PMD suppression device comprises a polarization controller, an output signal monitoring feedback device and a reverse transmission channel, wherein the polarization controller is arranged at the input end of an optical transmission link; the output signal monitoring feedback device is arranged at the output end of the optical transmission link; the reverse transmission channel returns an output monitoring signal to the polarization controller at the input end of the optical transmission link; the polarization controller adjusts the polarization state of input light according to channel PMD detected in real time by the output signal monitoring feedback device or variation of transmission performance occurring due to influence of the PMD. The device and the system change the coupling shape of the polarization mode in the link by a method of changing the polarization state of the input signal so as to influence chromatic dispersion of the link polarization mode, and lead the transmission link to constantly maintain lower comprehensive features of the PMD by monitoring a received signal, thereby suppressing the chromatic dispersion of the polarization mode of the transmission link, and improving the transmission performance of the system.

Description

technical field [0001] The invention relates to a PMD suppression device, in particular to a PMD suppression device and an optical communication system of a high-speed optical communication system. Background technique [0002] The factors that limit the transmission performance of optical communication systems mainly include line attenuation, dispersion, noise, nonlinearity, and polarization mode dispersion. Due to the emergence of optical amplification and dispersion compensation technology, the influence of attenuation and dispersion on transmission has been well understood. However, the Raman (Ramam) optical amplification and forward error correction (FEC) technology solves the noise problem to a certain extent. The nonlinear problem can be properly avoided by reducing the optical power of the line. Although the polarization mode dispersion problem It has been alleviated due to the improvement of optical fiber manufacturing technology, but it is still an insurmountable o...

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Problems solved by technology

[0006] The relatively mature PMD compensation technology is the first-order compensation and the second-order compensation. The effect of the first-order compensation is poor, and the effect of the second-order compensation is not ideal, and the control is complicated, the cost is high, and basically only for a single transmission channel. Compensation, full-order PMD compensation is still in the research and exploration stage; and the method of using line coding or receiving signal shaping to improve the PMD tolerance of transmission equipment is due to the complexity of high-speed system technology, high cost and extremely high threshold, and the degree of performance improvement Limited; the method of reducing the PMD coefficient of optical fiber has made great breakthroughs in the past few years, so that the PMD of the optical transmission link in the early years will affect the performance of the 655Mbps low-speed optical transmission system. The impact on performance is not very serious, but it is difficult to further improve it at present; and finding ways to reduce PMD from the perspective of optical cable manufacturing and laying is still in the groping stage, both in theory and in practice, and it is difficult to make breakthroughs in the short term; The method of suppressing the influence of link PMD on transmission equipment is only the exploration of fast polarization mode disturbance, and its effect is relatively limited. The most critical thing is to limit the possibility of system compatibility with 100Gbps

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