Overcoming the modal bandwidth limitation of multimode fiber by using passband modulation

It is demonstrated that the bandwidth limitation of multimode fiber links arising from modal dispersion can be overcome by using passband modulation in the frequency range beyond the 3 dB bandwidth. Transmission of 1.25 Gb/s over 500 m of near-worst case 62.5 μm multimode fiber is achieved using two subcarrier multiplexed channels at the 850-nm wavelength.