Abstract
We report that the center-launching technique can be improved to selectively
excite the fundamental mode of multimode fiber (MMF). This “mode-field matched”
center-launching technique enables us to excite only the fundamental mode in the MMF
and, consequently, avoid the inherent limitations imposed by the differential mode
delay. We realize this mode-field matched center-launching technique simply by
fusion-splicing a single-mode fiber (SMF) pigtailed transmitter to the MMF. The splicing
condition is optimized to expand the core of SMF slightly so that it can match the mode
field distribution of the fundamental mode of MMF. The results show that, by using this
launching technique, we can achieve the transmission characteristics similar to SMF and
drastically increase the bandwidth-distance product of MMF. For demonstrations, we have
successfully transmitted 10- and 40-Gb/s signals over 12.2 and 3.7 km of MMF,
respectively, without using any dispersion compensation techniques. We have also
evaluated the robustness of the MMF link implemented by using the proposed launching
technique against the mechanical perturbations such as the lateral offset between fiber
connectors, fiber bending, and fiber shaking.
© 2009 IEEE
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