The passive optical network (PON) using orthogonal frequency-division multiplexing (OFDM) is a subject of many research works recently. The OFDM signal is especially good for long reach (LR)-PON due to its high tolerance to chromatic dispersion and high spectral ef?ciency. We study, for the ?rst time, the possibility of using OFDM for signal remodulation in LR-PONs. Three different colorless optical networking unit (ONU) architectures, electroabsorption modulator-based, re?ective semiconductor optical ampli?er-based, and injection-locked Fabry-Pérot laser diode-based ONUs, are tested and compared. Error-free operations are achieved in 100-km ?ber transmission without dispersion compensation.
- Orthogonal frequency-division multiplexing (OFDM)
- Passive optical networks (PONs)
- Signal remodulation