Optical transmission method and device based on power spectrum shaping

Abstract

The invention discloses an optical transmission method and device based on power spectrum shaping, which supports direct detection of optical signals with high spectral efficiency, that is, square demodulation. The present invention adopts the power spectrum shaping modulation method at the sending end, and the modulation method is passed at the zero point, that is, V π Bias the Mazeng optical modulator, increase the level, combine with nonlinear precoding, realize multi-level improved duobinary coding and multi-level biased duobinary coding, and also combine optical filters to realize vestigial sideband improved duobinary coding; At the receiving end, nonlinear equalization is used to remove intersymbol interference from the received signal, and at the same time, the difference in received level can be fed back to the transmitter to realize non-equidistant multi-level modulation and reduce the complexity of nonlinear equalization. The present invention enables direct detection of signals requiring coherent demodulation through proper nonlinear precoding and nonlinear equalization, thereby reducing hardware complexity.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and in particular relates to an optical transmission method and device based on power spectrum shaping. Background technique [0002] In recent years, optical communication has become the preferred research object for internal interconnection, external interconnection and access of data centers, which can meet the increasing bandwidth requirements of enterprises or operators for information and data processing systems. With the introduction of the tactile Internet, in addition to bandwidth, the requirements for quality of service have added ultra-low latency, high reliability, high availability, and high security. Among them, the requirement of ultra-low latency can be achieved by optimizing the transmission scheme, high reliability can be achieved by redundant coding, high availability can be achieved by redundant resource backup, and high security can be achieved by redundant encr...

AI Technical Summary

Problems solved by technology

However, the Mazeng modulator in this research is biased at the quadrature point, not the zero point. Therefore, the signal amplitude is all positive, and the signal has no inflection during square demodulation, which is still within the range that linear equalization can handle.

On the other hand, signal amplitudes that are all positive result in higher signal power

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