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In this letter, we demonstrate a seven-core few-mode erbium-doped fiber amplifier by core pumping for long-haul transmission system using a few-mode multicore fiber. The differential modal gain between the LP01 and LP11 modes is reduced to 3.2 dB or less regardless of the pumping-light mode using a ring-core refractive-index profile, and flattened averaged gains of over 20 dB and noise figures of...
We have demonstrated mode division multiplexed transmission using a space-optics based mode multiplexer/demultiplexer. In the experiment, 10 Gb/s NRZ-OOK signal and interfering CW light were simultaneously transmitted through a 2km-long two-mode fiber with BER<10−9.
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