期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 28, 期 10, 页码 1547-1555出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2010.2047843
关键词
Group delays; impulse response; index profile; multimode fiber; mode coupling; optical fiber communication; LAN bandwidth
We show that a controlled intentional mode coupling induced via scattering from core inclusions can substantially improve the bandwidth of graded index multimode fibers with centerline defect. We present a comprehensive analysis of the impact of the dielectric constant, size, density, and location of micrometer size inclusions on the bandwidth and attenuation of these fibers. We show that using a proper design, the bandwidth of a 1-km-long fiber can improve from 693-MHz to more than 2.5-GHz with less than 1-dB additional power loss. We also show that in practice, it is possible to obtain the desired level of mode coupling by exposing the photosensitive core of the fiber to a UV laser, therefore creating the micrometer size inclusions after the draw process.
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