Thermal characteristics of optical delay in fibers used in pulsed laser rangefinding

Seppo Nissilä, Juha Kostamovaara, Risto Myllylä

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)


The transit times of light pulses as functions of temperature in nylon and acryl-coated fibers and hard-clad silica (HCS) fibers are analyzed theoretically and compared with the measured results. The effect of temperature on the transit time can be explained in terms of generally known models and the physical and thermal coefficients of the materials. The thermal effect in a core-cladding interface can have unpredictable consequences, however, as in HCS fibers. Because of the increased inhomogeneities at the interface of the core-cladding, the transit time of a light pulse increases, in contrast to that in a glass fiber, at lower temperatures. Thus the light pulses have larger angles of propagation than is shown by the numerical aperture of the fiber, and at the same time the attenuation of the fiber increases.
Original languageEnglish
Pages (from-to)1464 - 1466
Number of pages3
JournalJournal of Lightwave Technology
Issue number11
Publication statusPublished - 1991
MoE publication typeA1 Journal article-refereed

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