Microbend-induced mode coupling in a graded-index multimode fiber

Lei Su, Kin Seng Chiang, Chao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

34 Citations (Scopus)


We present a theoretical analysis of the mode coupling effects at a microbend along a graded-index (GI) multimode fiber (MMF). By matching the incident and excited mode fields at the microbend, we obtain the coupling coefficients among the guided modes at different microbending conditions. The theoretical results compare well with the experimental results from near-field measurements on a GI MMF subject to microbending. The usefulness of our theory is demonstrated with two applications: (i) an explanation of the operation principle of a wavelength-switchable fiber laser that contains a fiber Bragg grating in a GI MMF and (ii) quantification of the function of a microbend-based mode scrambler.
Original languageEnglish
Pages (from-to)7394-7402
Number of pages9
JournalApplied Optics
Issue number34
Publication statusPublished - 1 Dec 2005
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this