CO-OFDM transmission system nonlinear damage compensation system and method

Abstract

The invention discloses a CO-OFDM transmission system nonlinear damage compensation system and method, and the system comprises a radio frequency OFDM transmitter which carries out the modulation andmapping of a to-be-transmitted signal, and transmits the modulated and mapped signal to an optical I / O modulator; an optical I / O modulator which converts the received signal from an electric signal into an OFDM optical signal, and transmits the OFDM optical signal to an optical fiber link; each OPC optical phase conjugation device in the optical fiber link couples the signals and generates opposite signals through a high nonlinear optical fiber HNLF so as to compensate nonlinear damage of the optical fiber link; the optical fiber link sends an output signal to the optical coherence detector; the optical coherence detector demodulates the received signal, demodulates the optical signal into an electric signal, and sends the demodulated electric signal to the radio frequency OFDM receiver; and the radio frequency OFDM receiver restores the received electric signal.

Description

technical field [0001] The present disclosure relates to the technical field of optical communication, in particular to a system and method for nonlinear damage compensation of a CO-OFDM transmission system. Background technique [0002] The statements in this section merely mention background art related to the present disclosure and do not necessarily constitute prior art. [0003] Optical communication CO-OFDM (Coherent Optical Orthogonal Frequency Dixision Multiplexing, coherent optical orthogonal frequency division multiplexing) transmission system perfectly integrates OFDM modulation technology and coherent receiving technology, but while combining the advantages of the two, the corresponding problems and Challenges also follow. [0004] In the process of realizing the present disclosure, the inventors found that the following technical problems existed in the prior art: [0005] Since the OFDM technology divides the channel into multiple orthogonal and parallel sub-...

AI Technical Summary

Problems solved by technology

[0005] Since the OFDM technology divides the channel into multiple orthogonal and parallel sub-channels, the system is very easy to meet the phase matching conditions of the nonlinear four-wave mixing effect, resulting in serious inter-carrier interference.

At the same time, because the CO-OFDM transmission signal has a higher peak-to-average power ratio, this will make the system more likely to reach the threshold of the Kerr effect, which will be further affected by self-phase modulation and cross-phase modulation

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