Information Model for Impaired Optical Path Validation
| No major update from the last version | |
| Moustafa Kattan was added to co-author | |
| Impairments in optical networks can be accounted for in a number of ways as discussed in the Impairment Framework draft . This draft provides an information model for path validation in optical networks utilizing approximate computations. | |
| The definitions, characteristics and usage of the optical parameters that form this model are based on ITU-T recommendation G.680 and related. We do not define any new impairment parameters here. | |
| This impairment related model is intentionally compatible with the impairment free model of reference [RWA-Info]. | |
| Appendix A presents a model for distributed estimation of impairment parameters (R+ distributed WA & IV). |
Categorization of Impairment Parameters
| Apply to the network element (NE) as a whole | ||
| Get one parameter of each particular type in this category per NE | ||
| Vary on a per port basis | ||
| Get one parameter of each particular type in this category per NE port. Not all parameters different so smart encoding can save “space”. | ||
| Vary based on port to port pairs | ||
| Get one parameter of each particular type in this category per (ingress port, egress port) pair. Not all parameters different so smart encoding can save “space”. | ||
Frequency Dependence of Parameters
| Many optical parameters can exhibit significant variation over frequencies of interest to the network these may include: | ||
| Channel insertion loss deviation (dB, Max) | ||
| Channel chromatic dispersion (ps/nm, Max, Min) | ||
| Channel uniformity (dB, Max) | ||
| Insertion loss (dB, Max, Min) | ||
| Channel extinction (dB, Min) | ||
| Channel signal-spontaneous noise figure (dB, Max) | ||
| Channel gain (dB, Max, Min) | ||
| Others TDB in conjunction with ITU-T Q6/15 | ||
What is not currently covered in this document
| The end system models (i.e., transmitter and receiver models based on the interfaces defined in G.698.1 and G.698.2) are not included in G.680 but in other ITU documents. | |
| Distributed impairment accumulation model attached in appendix (G.680 included Distributed impairment accumulation model only in its appendix) | |
| General Issues | ||
| Should distributed computation model be included here or work on a separate draft when time is mature? | ||
| Transmitter and Receiver characteristics are not specified in G.680 but in other ITU-T recommendations. Should these be including in info model? Connection request? | ||
| Issues useful to liaise with ITU-T SG15/Q6 | ||
| Not all impairments are included in G.680 – Our approach is to begin with what G.680 has defined. | ||
| Interpolation modeling of frequency dependence? | ||