Rec. ITU-T G.9804.3 (09/2021) 50-Gigabit-capable passive optical networks (50G-PON): Physical media dependent (PMD) layer specification
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
     3.1  Terms defined elsewhere
     3.2  Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 Architecture of the optical access network
     6.1 Classes for optical path loss
     6.2 Categories for fibre differential distance
7 This clause is intentionally left blank
8 This clause is intentionally left blank
9 Optical network requirements
     9.1 Layered structure of optical network
     9.2 PMD layer requirements for the 50G-PON
          9.2.1 Line rate
               9.2.1.1 Downstream frequency accuracy
               9.2.1.2 Upstream frequency accuracy
          9.2.2 Forward error correction (FEC) code selection for 50G-PON
          9.2.3 Physical media and transmission method
               9.2.3.1 Transmission medium
               9.2.3.2 Transmission direction
               9.2.3.3 Transmission methodology
          9.2.4 Line code and interleaving
               9.2.4.1 Downstream
               9.2.4.2 Upstream
          9.2.5 Operating wavelength
               9.2.5.1 Downstream wavelength allocation
               9.2.5.2 Upstream wavelength allocation
          9.2.6 50G-PON PMD parameters
               9.2.6.1 50G-PON compatible ODN
               9.2.6.2 Optical interface parameters of 49.7664 Gbit/s downstream direction
               9.2.6.3 Optical interface parameters of upstream direction
          9.2.7 Transmitter at S/R (or S/Rm) and R/S
               9.2.7.1 Source type
               9.2.7.2 Spectral characteristics
               9.2.7.3 Mean launch power
                    9.2.7.3.1 Launch optical power without input to the transmitter
               9.2.7.4 Minimum extinction ratio
               9.2.7.5 Maximum reflectance of equipment measured at transmitter wavelength
               9.2.7.6 Mask of transmitter eye diagram
                    9.2.7.6.1 OLT transmitter
                    9.2.7.6.2 ONU transmitter
               9.2.7.7 Transmitter tolerance to reflected optical power
               9.2.7.8 Transmitter and dispersion eye closure
                    9.2.7.8.1 OLT TDEC test method
          9.2.8 Optical path between S/R (or S/Rm) and R/S
               9.2.8.1 Attenuation range
               9.2.8.2 Minimum optical return loss of the cable plant at point R/S including any connectors
               9.2.8.3 Maximum discrete reflectance between points S and R
               9.2.8.4 Dispersion
          9.2.9 Receiver at S/R (or S/Rm) and R/S
               9.2.9.1 Receiver sensitivity
               9.2.9.2 Receiver overload
               9.2.9.3 Maximum optical path penalty
               9.2.9.4 Maximum reflectance at R/S measured at receiver wavelength
               9.2.9.5 Differential optical path loss
               9.2.9.6 Clock extraction capability
               9.2.9.7 Jitter performance
                    9.2.9.7.1 Jitter transfer
                    9.2.9.7.2 Jitter tolerance
                    9.2.9.7.3 Jitter generation
               9.2.9.8 Consecutive identical digit (CID) immunity
               9.2.9.9 Receiver tolerance to reflected power
               9.2.9.10 Transmission quality and error performance
10 X/S tolerance of 50G-PON ONU and OLT
     10.1 Versatile WDM configuration
11 Upstream physical layer overhead
Appendix I  Relationship between OMA, penalty, extinction ratio and average power
Appendix II  Physical layer measurements required to support optical layer supervision
Appendix III  Allocation of the physical layer overhead time
Appendix IV  Relationship among optical interface parameters for 49.7664 Gbit/s downstream
Bibliography
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