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Will the light make it?

Optical-layer sizing for a proposed light path: OSNR margin, reach budget versus path distance, regeneration sites, and the assigned C-band wavelength. Strand tracing lives on the fiber plant surface; this is the photonic layer above it.

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LayerPhotonicDWDM C-band, above OSP
FEC threshold13 dBOSNR floor per span
Launch budget30 dBper amplified span
Reach modelLine-ratehigher bitrate, shorter span

Light-path planner

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The planner draws the great-circle path between two PoPs, slices it into amplified spans sized for the line rate, and checks per-span OSNR against the FEC threshold. Regeneration sites snap to the nearest PoP where one sits close, otherwise they land as in-line amplifier huts. Every figure below flows through the API seam; raise the line rate to watch the span budget shrink and the regen count climb.

Pick two distinct endpoints to size the light path between them.