Abstract

Real-time dual-band optical orthogonal frequency-division multiplexing (OOFDM) transceivers incorporating digital-to-analog and analog-to-digital converters operating at sampling speeds as low as $4\mathrm{GS}/\mathrm{s}$ and field-programmable gate-array-based digital signal processing clocked at only 100 MHz are employed to explore the maximum achievable transmission performance of electro-absorption modulated laser-based multimode fiber (MMF) systems subject to conventional optical launching. Making use of adaptive subcarrier bit and subcarrier/subband power loading, record-high $20.125\mathrm{Gb}/\mathrm{s}$ transmission over 800 m OM2 MMF of real-time dual-band OOFDM signals is experimentally demonstrated, for the first time, with an optical power penalty as low as 1 dB. In addition, extensive experimental explorations of dual-band OOFDM capacity versus reach performance are also undertaken over the aforementioned systems consisting of different MMF types and lengths. It is shown that $20.125\mathrm{Gb}/\mathrm{s}$ over 100 m and $19.625\mathrm{Gb}/\mathrm{s}$ over 1000 m OOFDM transmissions are obtainable in OM2-only MMF systems and that $20\mathrm{Gb}/\mathrm{s}$ over 100 m and $19.375\mathrm{Gb}/\mathrm{s}$ over 1000 m OOFDM transmissions are achievable in OM1-only MMF systems. Furthermore, in various OM1 and OM2 MMF systems, minimum optical power penalties of $<1\mathrm{dB}$ are observed for MMF transmission distances ranging from 300 to 800 m. Experimental results indicate that $>19\mathrm{Gb}/\mathrm{s}$ over 1000 m transmission of dual-band OOFDM signals are practically feasible in any legacy MMF systems.

© 2013 Optical Society of America

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