Abstract
In this paper, we propose and experimentally demonstrate a direct re-modulation scheme for an IM/DD OFDM-WDM-PON. By adjusting the modulation index of the downstream OFDM data via its peak-to-peak laser driving voltage (Vpp), the proposed scheme directly modulates the upstream OFDM data onto the received wavelength at the optical network unit without employing any downstream data erasing technique or using any reflective semiconductor optical amplifier. Thanks to the reduced modulation index of the downstream data, the upstream data can be detected at the optical line terminal by simply regarding the residual downstream signal in the uplink as noise. And a 10-Gb/s symmetrical bi-directional transmission with the BER performance below 3.8×10−3 is experimentally demonstrated.
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