Mode Beating Analysis by Sample Stretching and Wavelength Sweeping in a Few-Mode Fiber

We analyze the beating of coherently copropagating modes in a few-mode optical fiber using two complementary techniques, which involve respectively stretching the sample under examination and sweeping the wavelength for different polarizations of the incoming light. We show that analyzing the spectr...

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Bibliographic Details
Published in:Journal of lightwave technology 2014-02, Vol.32 (3), p.494-504
Main Authors: Travagnin, Martino, Sartori, Francesco, Ruzzier, Marco
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Few-mode fiber
Information, signal and communications theory
Integrated optics. Optical fibers and wave guides
modal spectroscopy
mode-beating analysis
multipath interference
Multiplexing
Optical and optoelectronic circuits
Optical polarization
Optical sensors
Oscillators
Refractive index
Signal and communications theory
Strain
Telecommunications and information theory
Wavelength measurement
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Description
Summary:We analyze the beating of coherently copropagating modes in a few-mode optical fiber using two complementary techniques, which involve respectively stretching the sample under examination and sweeping the wavelength for different polarizations of the incoming light. We show that analyzing the spectral composition of the intensity fluctuations allows for a direct measurement of the difference between the mode propagation constants and between their group delays, and we observe the lifting of the mode degeneracy, most possibly induced by residual anisotropies and birefringence. The outlined methodology can be used for the modal characterization of few-mode fibers employed in sensing and in spatially-multiplexed communications.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2013.2294475