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Propagation of pulse fluctuations of multimode sources in optical fibers and waveguides with arbitrary chromatic dispersion

  • José Capmany
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Abstract

We extend Marcuse analysis of pulse fluctuations of randomly phased multimode sources to arbitrary chromatic dispersion, chirp, finite mode linewidth, mode partition noise and finite receiver bandwidth. On long fibers the fluctuations depend only on the shape of the group delay curve, a monotonic delay separates the modes, whereas a symmetric delay leaves pairs of modes with identical intensity profiles and a persistent beat noise. Dispersion downconverts the beats of overlapping modes to baseband, where receivers cannot filter them. The detected power follows random phasor statistics, and Gaussian estimates of fade probability can be wrong by orders of magnitude. Mode partition noise grows with dispersion and dominates in band limited links.

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Cite

BibTeXRIS
BibTeX
@misc{capmany2026propagation,
  title = {{Propagation of pulse fluctuations of multimode sources in optical fibers and waveguides with arbitrary chromatic dispersion}},
  author = {José Capmany},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.33320},
  eprint = {2609.33320},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.33320},
}
RIS
TY  - UNPB
TI  - Propagation of pulse fluctuations of multimode sources in optical fibers and waveguides with arbitrary chromatic dispersion
AU  - José Capmany
PY  - 2026
DA  - 2026/09/27
PB  - arXiv
DO  - 10.48550/arxiv.2609.33320
UR  - https://arxiv.org/abs/2609.33320
AB  - We extend Marcuse analysis of pulse fluctuations of randomly phased multimode sources to arbitrary chromatic dispersion, chirp, finite mode linewidth, mode partition noise and finite receiver bandwidth. On long fibers the fluctuations depend only on the shape of the group delay curve, a monotonic delay separates the modes, whereas a symmetric delay leaves pairs of modes with identical intensity profiles and a persistent beat noise. Dispersion downconverts the beats of overlapping modes to baseband, where receivers cannot filter them. The detected power follows random phasor statistics, and Gaussian estimates of fade probability can be wrong by orders of magnitude. Mode partition noise grows with dispersion and dominates in band limited links.
ER  -