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Proceedings Paper

Multimode dispersion in step-index polymer optical fibers
Author(s): Douglas P. Karim
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Paper Abstract

Pulse broadening in large core step-index optical fibers is dominated by multimode dispersion. The bandwidth of PMMA core polymer optical fiber depends on launch conditions, being substantially greater for collimated input than for mode-filled launching. The dispersion behavior is significantly affected by both mode dependent attenuation and by power coupling between modes. The results of time-domain dispersion measurements performed at 650 nm are presented and examined. The effects of launching conditions and fiber numerical aperture on bandwidth are discussed. Mode conversion is studied by examining far-field output patterns under various launch conditions. Disturbances caused by sharp bends, splices, and couplers can modify the distribution of energy among modes and thus effect the dispersion. Because only the propagation after the disturbance is effected, a given fiber optic link can have different effective bandwidths in the two counter propagating directions. Finally, a method of realizing higher effective bandwidth over a given fiber by mode-selective detection is presented.

Paper Details

Date Published: 9 February 1993
PDF: 10 pages
Proc. SPIE 1799, Specialty Fiber Optic Systems for Mobile Platforms and Plastic Optical Fibers, (9 February 1993); doi: 10.1117/12.141366
Show Author Affiliations
Douglas P. Karim, Hoechst Celanese Research Co. (United States)


Published in SPIE Proceedings Vol. 1799:
Specialty Fiber Optic Systems for Mobile Platforms and Plastic Optical Fibers
Luis Figueroa; Mototaka Kitazawa; Norris E. Lewis; Robert E. Steele; Deepak Varshneya, Editor(s)

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