[Objective]Aiming at the limited transmission distance of ultra-long distance optical transmission system using re-mote pump technology,this paper proposes a single span repeaterless transmission system with mixed transmission of 100 and 200 Gbit/s service.The experiment tests the maximum span loss of the system by adjusting the input power of the system and the position of the remote pump gain unit in the system without considering the influence of other factors such as dispersion.[Methods]The key amplification technologies in the experiment mainly include remote pump amplification technology,Erbi-um-doped optical fiber amplification technology and Raman amplification technology.In the transmission,Erbium-doped opti-cal fiber amplifier,Raman amplifier and remote pump gain unit are used to carry out non-relay amplification of optical signals in the system,and the relay transmission distance is further improved by adjusting the position of remote pump gain unit.The remote pump bypass access method which can improve the amplification gain of remote pump is used in the experiment.[Re-sults]Three different modules were used in the experiment,with a total of 9 service waves.The modulation formats of 200 Gbit/s Polarization Multiplexed-Quadrature Phase Shift Keying(PM-QPSK),100 Gbit/s PM-QPSK and 200 Gbit/s Po-larization Multiplexed-16 Quadrature Amplitude Modulation(PM-16QAM)were used respectively.The transmission experi-ments were constructed by G.654b ultra-low loss optical fiber with a loss of 0.17 dB/km.Finally,the single-span ultra-long distance transmission with a total capacity of 1.5 Tbit/s and a cross-segment loss of 75 dB is realized.[Conclusion]The results show that the transmission distance of the system can be improved by setting the optimal fiber input power and adjusting the position of the gain unit of the remote pump.The experimental results provide reference value for the construction of the ultra-long distance optical transmission system based on the remote pump technology,and provide reference data for the develop-ment of the repeaterless transmission based on the remote pump technology.
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