one-way propagation delay in single-mode fiber (index ~1.47); ~5 us/km rule of thumb, ~10 us/km round-trip
~4.9 µs/kmobserved
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| As of | 2025 |
| Source | M2 Optics; MapYourTech (5-microsecond rule) · Single-mode fiber rule-of-thumb calculation; 4.9 microseconds per kilometer using refractive index 1.47 |
| Review | checking…review by 2026-10-25 · standard cadence |
| Recorded changes | last 2026-07-14 · 2 revisions tracked |
| Claim id | one-way-propagation-delay-in-single-mode-fiber |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.