A system and method for nonlinear damage compensation of co-ofdm transmission system

Abstract

The present disclosure discloses a system and method for nonlinear damage compensation of a CO-OFDM transmission system, including: a radio frequency OFDM transmitter, the radio frequency OFDM transmitter performs modulation mapping on a signal to be transmitted, and sends the modulated and mapped signal to an optical I / O modulator; the optical I / O modulator converts the received signal from an electrical signal to an OFDM optical signal, and transmits the OFDM optical signal to the optical fiber link; each OPC optical phase conjugation device in the optical fiber link Coupling the signal and generating the opposite signal through the highly nonlinear optical fiber HNLF, thereby compensating the nonlinear damage of the optical fiber link; the optical fiber link sends the output signal to the optical coherent detector; the optical coherent detector detects the received signal Perform demodulation, demodulate the optical signal into an electrical signal, and send the demodulated electrical signal to the radio frequency OFDM receiver; the radio frequency OFDM receiver restores the received electrical 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

Images