A joint compensation method for carrier crosstalk and polarization crosstalk in multi-carrier system

Abstract

The invention discloses a joint compensation method for carrier crosstalk and polarization crosstalk in a multi-carrier system. The signal obtained by shifting the frequency of adjacent subcarriers by using three adaptive filters and another signal of the same frequency and different polarization are jointly processed. Carrier crosstalk compensation and polarization mode dispersion compensation are performed on the original signal, and the tap coefficient of the filter is continuously updated with the input of the signal. The original signal is restored through different tap coefficient ratios of each filter, which can effectively eliminate the original signal. Spectral crosstalk and polarization mode dispersion interference. Based on the joint compensation method for inter-carrier crosstalk and polarization mode dispersion proposed by the present invention, the spectral efficiency of the transmitted signal can be effectively improved, the transmission distance in the optical fiber can be increased, the signal-to-noise ratio at the receiving end can be effectively increased and the bit error rate can be reduced . It has important application prospects in high-speed, high-density and multi-carrier optical fiber transmission systems.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a joint compensation method for carrier crosstalk and polarization crosstalk in a multi-carrier system. Background technique [0002] At this stage, optical fiber transmission has become the mainstream of high-speed and large-capacity long-distance communication technology. Due to its low loss of optical transmission, optical fibers can transmit information-carrying optical signals over long distances. In addition, due to the horizontal generation of optical fiber amplifiers, optical signals can be transmitted ten times longer than before. [0003] With the development of current 5G and 6G technologies, the problem of high-speed transmission of large-capacity data needs to be solved urgently. According to Shannon's information theory, the signal-to-noise ratio and bandwidth are inversely proportional, and high-speed will generate high-bandwidth, so it is poss...

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Problems solved by technology

[0004] With the further development of optical signals and optical fibers, the existing technology proposes to use dual-polarized light for signal transmission, which can double the data transmission rate, but due to the non-ideal and birefringent properties of optical fibers, resulting in Dual polarized light will produce polarization mode dispersion and other problems in the process of optical fiber transmission, which will seriously affect the quality of the transmitted signal

[0005] Most of today's high-speed and large-capacity single-mode fiber transmission systems use multi-subcarrier dual-polarization signals. Traditional OFDM transmission systems and Nyquist WDM transmission systems have certain constraints, that is, adjacent subcarriers must be satisfied. The interval is equal to the baud rate, if it is less than the baud rate, serious inter-carrier crosstalk will occur

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