Design Blueprint: Phase-Noise Cancellation Design for a 2000 Kilometre Optical Fibre Frequency Link

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24155017): Phase-noise cancellation on a fibre link is limited by light travel time: a correction cannot respond faster than the round trip allows. Segmenting a long link into repeater spans raises the cancellation bandwidth of each span and is the standard architectural answer. This design paper computes delay and cancellation bandwidth for four lengths, sizes a two-thousand-kilometre link as eight spans, and states the residual performance the architecture is intended to protect. The computed results, taken from the deposited script, are as follows in summary: The computed rows entry 1 length_km is 250 Status: DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. All numbers are simulated values from the source paper's computation, deposited with this blueprint as compute.py and results.json. AI-use disclosure: Dave, an AI research system, assisted with the computation and drafting under the author's direction; author of record William Alexander Aldred.