Joint compensation method and device of mode dependent loss and polarization dependent loss

Abstract

The invention provides a joint compensation method of mode dependent loss and polarization dependent loss. The method comprises the following steps: S1, performing constellation modulation on a bit signal; S2, performing mode polarization time encoding on the signal after the constellation modulation; S3, performing light modulation on the signal after the mode polarization time encoding; S4, performing light polarization beam combination on the signal after the light modulation; S5, performing mode coupling on the signal after the light polarization beam combination; S6, decoupling the signal in mode coupling; S7, performing light polarization beam splitting on the decoupled signal; S8, performing coherent demodulation on the signal after the light polarization beam splitting; S9, performing channel equalization on the signal after the coherent demodulation; S10, performing mode polarization time decoding on the signal after the channel equalization; and S11, performing constellation demodulation on the decoded signal. Through the adoption of the method provided by the invention, the mode dependent loss and the polarization dependent loss in the transmission process can be effectively inhibited, and the system performance is improved.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a joint compensation method and device for mode-dependent loss and polarization-dependent loss. Background technique [0002] With the exponential capacity growth in the past two decades, wavelength division multiplexing has become an important technical form of data optical network. An important reason for this situation is the continuous and rapid increase in data network traffic. However, recent research progress shows that the capacity growth of wavelength division multiplexing optical transmission is obviously slowing down, and its system experiments are rapidly approaching the Shannon limit of nonlinear optical fiber transmission. Mode Division Multiplexing (MDM for short) in few-mode fiber is a brand-new optical multiple-input multiple-output transmission form, and is expected to be an important potential solution to further increase the capacity of optical network...

AI Technical Summary

Problems solved by technology

[0004] Although MDM technology is considered to be an important method to improve the capacity of optical networks, the existence of Mode Dependent Loss (MDL for short) and Polarization Dependent Loss (PDL for short) in MDM not only makes optical fiber transmission process Changes in other transmission characteristics also cause deterioration to the transmission system, such as the fluctuation of the polarization state during transmission, which leads to changes in the optical signal-to-noise ratio, resulting in changes in optical power

It can also cause gain fluctuations and the performance of the compensator at the receiver can also be affected

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