Interpretation of polarization dispersion in a single-mode fiber

Makoto Tsubokawa*, Masaharu Ohashi

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter


In a weak birefringent fiber such as a typical single-mode fiber, the group delay difference between two eigen modes decays due to the mode conversion effect. It tends to saturate with distance, and its second moments, contributing to the pulse broadening, increases at a constant rate. However, strictly speaking, no polarization mode is defined for a fiber having birefringence perturbation along a fiber axis. Thus, polarization dispersion experimentally evaluated for a real fiber is not yet clear. This paper shows a new interpretation of polarization dispersion of a long single-mode fiber. The group delay difference is evaluated through the evolution of SOP on the Poincare sphere, and its length dependence is briefly estimated. The group delay difference observed at a fiber end contains information of the power distribution ratios at local parts of a fiber, and it grows with distance, like a pulse width. As a result, the evaluated group delay difference is expected to increase with distance at an almost constant ratio over a 1000 km-length. Evaluation of polarization dispersion is noted as a potential limitation in long-haul transmission systems.

Original languageEnglish
Title of host publicationNIST Special Publication
PublisherPubl by Natl Inst of Standards & Technology
Number of pages4
Publication statusPublished - 1990 Sep
Externally publishedYes
EventSixth Technical Digest Symposium on Optical Fiber Measurements - 1990 - Boulder, CO, USA
Duration: 1990 Sep 111990 Sep 12


OtherSixth Technical Digest Symposium on Optical Fiber Measurements - 1990
CityBoulder, CO, USA

ASJC Scopus subject areas

  • Engineering(all)


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