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. Direct detection, namely square demodulation, of high-spectrum-efficiency optical signals is supported. According to the invention, a power spectrum shaping modulation method is adopted at a sending end, and the modulation method realizes multi-level improved dual-binary coding and multi-level offsetdual-binary coding by biasing a Mach-Zehnder optical modulator at a zero point, namely Vpi, and increasing level in combination with nonlinear precoding, and can also realize residual sideband improved dual-binary coding in combination with an optical filter; inter-symbol interference of received signals is removed at a receiving end by adopting nonlinear equalization, and meanwhile, the difference of received levels can be fed back to a transmitter, so that non-equidistant multi-level modulation is realized, and the nonlinear equalization complexity is reduced. According to the method, signals needing coherent demodulation can be directly detected through proper nonlinear precoding and nonlinear equalization, so that the hardware complexity is reduced.

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 proposal of the tactile Internet, in addition to bandwidth, the quality of service requirements have increased ultra-low latency, high reliability, high availability, and high security. Among them, the requirement of ultra-low latency can be realized by optimizing the transmission scheme, while high reliability can be realized through redundant coding, high availability can be realized through redundant resource backup, and high security can be realized throu...

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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