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Mode division multiplexing (MDM) over few--mode fibers (FMFs) is considered a promising solution for surpassing the capacity limits of single--mode fiber systems. To meet this objective in capacity increase, MDM should comply with wavelength division multiplexing, i.e. apply over each wavelength. A crucial component for a MDM transmission system is the mode multiplexer (MUX), which should be broadband enough to be used in a WDM context. A broadband all--fiber mode MUX based on cascaded FMF couplers is presented and numerically analyzed. The MUX combines modes LP01, LP11a, LP11b, LP21a, LP21b, and LP02, with an optimized performance over the C band. By considering polarization multiplexing, an order of magnitude capacity increase is supported.
© 2013 IEEE
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