Article

Specklegram in a grapefruit fiber and its response to external mechanical disturbance in a single-multiple-single mode fiber structure.

Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P.O. Box 800211, 201800, Shanghai, China.
Applied Optics (impact factor: 1.41). 08/2008; 47(20):3543-8. pp.3543-8
Source: PubMed

ABSTRACT Specklegram in multimode fiber has successfully been used as a sensor for detecting mechanical disturbance. Speckles in a multimode pure silica grapefruit fiber are observed and compared to that of a step-index multimode fiber, showing different features between them. The sensitivities to external disturbance of two kinds of fiber were measured, based on single-multiple-single mode (SMS) fiber structure. Experimental results show that the grapefruit fiber shows higher sensitivity than does the step-index multimode fiber. The transmission spectrum of the grapefruit fiber was measured as well, showing some oscillation features that are significantly different from that of a step-index multimode fiber. The experiments may provide suggestions to understand the mechanisms of light propagation in grapefruit fibers.

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Keywords

detecting mechanical disturbance
 
different
 
different features
 
Experimental results
 
external disturbance
 
grapefruit fibers
 
higher sensitivity
 
light propagation
 
multimode fiber
 
multimode pure silica grapefruit fiber
 
oscillation features
 
single-multiple-single mode
 
SMS
 
step-index multimode fiber
 
suggestions