Multi-sub-block phase noise estimation compensation method suitable for CO-OFDM system

Abstract

The invention discloses a multi-sub-block phase noise estimation compensation method suitable for a CO-OFDM system. The method comprises the steps that each CO-OFDM symbol is divided into a plurality of sub-block symbols, so that light-phase noise of each sub-block symbol is estimated and the estimation accuracy and temporal resolution of the light-phase noise are improved. Meanwhile, signals obtained after channel balance is conducted are selected to serve as input of divided blocks, no complex crosstalk compensation algorithm among the residue symbols is needed in the sub-block phase noise estimation process, and the complexity of the algorithm is lowered. The method is high in practicability, the requirement for the line width of a laser light source of the CO-OFDM system can be effectively lowered, and the method has a great significance to application of the CO-OFDM system in a high-speed optical fiber communication network of the next generation.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and in particular relates to a method for estimating and compensating multi-subblock phase noise applicable to a CO-OFDM (coherent optical orthogonal frequency division multiplexing) system. Background technique [0002] Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM), as a multi-carrier coherent optical communication technology, has attracted extensive attention of scholars in recent years. [0003] CO-OFDM system structure such as figure 1 As shown, it can be divided into five modules according to their functions: CO-OFDM transmitter module 101, electro-optic modulation module 102, optical fiber transmission module 103, photoelectric detection module 104, and CO-OFDM receiver module 105, CO-OFDM transmitter module The generated electrical domain signal is transformed into a CO-OFDM signal in the optical domain through electro-optical modulation up-conversion...

AI Technical Summary

Problems solved by technology

The estimation scheme of a single CO-OFDM symbol can only estimate the mean value of the phase noise of the entire CO-OFDM symbol, which cannot accurately describe the variation of phase noise within a symbol over time in principle

The error of such phase noise estimation schemes increases with the increase of optical phase noise

In the case of large optical phase noise, the estimation error of the single CO-OFDM symbol phase noise estimation scheme will severely limit the overall performance of the CO-OFDM system

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