CSV provenance:
- table_II_active_length_exact.csv: exact table values transcribed from the manuscript.
- figure_6_reflectivity_digitized_approx.csv: approximate visual digitization of Fig. 6, not original source values.
- illustrative_gain_ASE_not_original.csv: synthetic demonstration data; do not represent as original simulation results.
- illustrative_material_gain_not_original.csv: synthetic qualitative spectra; do not represent as original simulation results.
- system_metrics_reported_not_recomputed.csv: system parameters and Q/BER values stated in manuscript; not independently simulated here.