Abstract
We propose a new method to optimize the core alignment of the butt
coupling between a single-mode optical fiber (SMF) and a graded-index
multimode optical fiber (GI-MMF) by monitoring the spectrum of Brillouin
scattered light. This method is stable, free from costly or elaborate
equipments, applicable to the coupling of optical fibers with different core
diameters or materials, and available even when the power of transmitted
light cannot be measured. We experimentally show the usefulness of this
method in the following three cases: where a silica-based SMF is
butt-coupled to 1) a silica-based GI-MMF with 50-<i>μ</i>m core
diameter; 2) a perfluorinated GI polymer optical fiber (PFGI-POF) with
62.5-<i>μ</i>m core diameter; and 3) a PFGI-POF with
120-<i>μ</i>m core diameter. Depending on the relative core
position, not only the Stokes power but also the Brillouin frequency shift
changed, which probably originates from the excitation of higher order
modes.
© 2011 IEEE
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