Nonlinear damage compensation method for modular division multiplexing communication system

Abstract

The invention discloses a nonlinear damage compensation method for a mode division multiplexing communication system, and belongs to the field of optical fiber communication. According to the method, PAM transmission nonlinear compensation of an OAM communication system is realized based on a probabilistic neural network, data symbols are grouped according to the memory length M, and the longer the memory length M is, the more approximate to a real OAM communication system model is; a sample form of the probabilistic neural network is changed according to memory length and bit error rate requirements of the OAM communication system, and a sample form which can eliminate influence of nonlinearity of the OAM communication system on a plurality of data symbols in a time domain and considers compensation efficiency is selected. By selecting the sample form, the data symbols transmitted in the OAM system can be efficiently recovered while the compensation complexity is lower, so that the influence of nonlinearity on the information transmission performance of the OAM optical communication system is compensated with high precision and high efficiency, and the bit error rate is reduced. According to the method, the computing power can be saved, and the hardware configuration requirement in practical application is reduced.

Description

technical field [0001] The invention belongs to the field of optical fiber communication, and relates to an OAM mode division multiplexing emphasizing direct detection PAM transmission non-linear compensation method based on a probability neural network. Background technique [0002] With the development of my country's socialist modernization, all walks of life have increasing requirements for communication services and capacity. The traditional non-return zero code (Non Return Zero Code, NRZ) modulation method has been unable to meet the blowout data requirements. 4-level PAM (Pulse Amplitude Modulation) uses 4-level amplitude modulation, and each level can carry 2 bits of information, which effectively doubles the link bandwidth and significantly reduces the signal-to-noise ratio (SNR). The 400 Gigabit Ethernet (GE) standard determines that PAM4 multi-level signaling is the recommended modulation system for implementing serial 400GE data center interfaces, and it is of g...

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Problems solved by technology

[0006] Since the complexity of the nonlinear model of the OAM communication system is higher than that of the traditional communication system, and the nonlinearity of the OAM communication system affects more adjacent data symbols in the time domain, a mode division multiplexing communication system disclosed in the present invention The technical problem to be solved by the nonlinear damage compensation method is: based on the probabilistic neural network to realize the non-linear compensation of PAM transmission in the OAM communication system, the data symbols are grouped according to the memory length M, and the longer the memory length M, the OAM communication system constructed by the probabilistic neural network is nonlinear. The model is closer to the real OAM communication system model. According to the memory length and bit error rate requirements of the OAM communication system, the sample form of the probabilistic neural network is changed, and the selection can eliminate the nonlinear influence of the OAM communication system on multiple data symbols in the time domain and take into account the compensation. Efficient sample form, by selecting the sample form, it can recover the data symbols transmitted in the OAM system with high efficiency while having lower compensation complexity, so as to compensate the influence of nonlinearity on the information transmission performance of the OAM optical communication system with high precision and high efficiency , to reduce the bit error rate

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