The main work of 50G-PON standardization has been basically completed.The downlink supports 50G line rate,and the uplink sup-ports 12.5 Gbit/s,25 Gbit/s,and 50 Gbit/s triple line rate.The 50G-PON supports the coexistence of GPON,XG(S)-PON,and 50G-PON in one ODN.The 50G line rate optical interface specification uses the OMA-TDEC parameter method.The transmit optical power,extinction ratio,and TDEC parameters of the optical module can be mutually compensated.The core performance must meet the requirement of the minimum launch power in OMA minus TDEC value.50G-PON introduces DSPs to improve the receiving sensitivity.To fully use the DSP equalization capability,the TIA and LA cannot use amplitude-limiting amplification but must support linear amplification.Linear burst LDD,trans-impedance amplifier,LA,and BCDR are key devices for 50G-PON upstream burst transmission.The 50G-PON uses LDPC error cor-rection technology to improve receiver sensitivity and can integrate with the DSP to support soft-decision LDPC.The SFP type GPON,XG(S)-PON,and 50G-PON three-generation combo are key requirements for 50G-PON OLT optical modules.The module structure layout and power consumption are major challenges.
50G-PONdigital signal processor equalizationlow-density parity-checkburst transmissionthree-generation Combo
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