Abstract
The time-resolved acousto-optic technique demonstrated recently to be a very useful method for the analysis of fiber axial non-uniformities, able to detect variations of fiber diameter in the nanometric scale with a spatial resolution of few cm. An edge interrogation approach is proposed to improve further the performance of this technique. The detection of subnanometer fiber diameter changes or sub-ppm changes of the core refractive index is demonstrated.
Highlights
IntroductionOptical fiber fabrication techniques meet extraordinary uniformity requirements
At present, optical fiber fabrication techniques meet extraordinary uniformity requirements
In some specific utilizations of fiber optics, even smaller non-uniformities along the fiber can have an impact on their performance
Summary
Optical fiber fabrication techniques meet extraordinary uniformity requirements. Compositional control allows constancy of refractive index for kilometer fiber lengths. Such a level of uniformity is sufficient for most applications. We reported on the use of a time-resolved acousto-optic (AO) technique for the analysis and characterization of axial non-uniformities in singlemode optical fibers [8]. It is based on the propagation of a short packet of a flexural wave along the fiber, which causes coupling between the core and a cladding mode. We show that some limitations of the technique can be overcome, and the sensitivity can be improved significantly, by monitoring the transmittance fluctuations at a specific out-of-resonance optical wavelength
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