Method and device for compensating mode dependent loss

Abstract

The invention provides a method and a device for compensating a mode dependent loss. The method comprises the following steps of: at a sending end, S1, carrying out constellation modulation on a bit signal; S2, carrying out mode time coding on the signal after the constellation modulation; S3, carrying out light modulation on the signal after the mode time coding; S4, carrying out mode coupling on the signal after the light modulation, and then sending to a few-mode optical fibre to transmit; at a receiving end, S5, carrying out decoupling on the mode coupling signal transmitted in the few-mode optical fibre; S6, carrying out coherent demodulation on the signal after the decoupling; S7, carrying out channel equalization on the signal after the coherent demodulation; S8, carrying out mode time decoding on the signal after the channel equalization; S9, carrying out constellation demodulation on the signal after the mode time decoding to obtain a bit signal after the constellation demodulation. The method provided by the invention is capable of effectively suppressing the mode dependent loss during the transmission process, and improving the system performance.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a mode-dependent loss compensation method and device. 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 networks. [0003] MDM technology is to ...

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) in MDM not only changes other transmission characteristics in the optical fiber transmission process, but also deteriorates the transmission system. , such as the fluctuation of polarization state during transmission leads to the change of optical signal-to-noise ratio, which leads to the change of 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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