[Objective]In order to cope with the growing demand for ultra-gigabit,from gigabit to 10-gigabit,from The 5th Gen-eration Fixed networks(F5G)to F5G-Advanced(F5.5G),50 Gbit/s Passive Optical Network(PON)is considered to be an im-portant part of F5.5G.Therefore,according to the current access network development situation,50 Gbit/s PON technology is deeply studied in this paper.[Methods]This paper first introduces the difficulties in achieving high sensitivity of 50 Gbit/s PON,and proposes a solution.50 Gbit/s Non-Return-Zero(NRZ)signals pass through Avalanche Photodiode(APD)detec-tors to form macroscopic currents that can be detected under the action of strong electric fields.The current is amplified by a Transresistance Amplifier(TIA)and converted into a voltage output.After balancing,the Feed Forward Equalizer(FFE)and Decision Feedback Equalizer(DFE)of optical Digital Signal Processing(oDSP)chip are used to compensate the trailing phe-nomenon of pulse signal,and then the influence of intersymbol interference is minimized by DFE.Then the paper analyses the key technologies such as APD,TIA and oDSP,and the receiving performance is compared with that of 25 Gbit/s APD.[Re-sults]According to the experimental test results of the two groups,the received optical power of the 25 Gbit/s APD in the first group is-8.48 dBm when the receiving signal has no error code during the test time of 4 min,and the received optical power reaches-26.61 dBm when the Bit Error Rate(BER)is 2.78e-2.In the case of 50 Gbit/s APD,the received optical power is-8.97 dBm when the received signal has no bit error in 4 min,and the received optical power reaches-27.05 dBm when the BER is 2.78e-2.The second set of 50 Gbit/s APD-2 data also achieves the same experimental results.[Conclusion]In conclu-sion,50 Gbit/s APD has higher receiving sensitivity,better performance,and is more suitable for use in 50 Gbit/s PON opti-cal modules to achieve high receiver sensitivity.Finally,a feasible scheme is proposed on the balance technology and APD for future cost reduction.
维普
万方数据