5-Gb/s upstream transmission using an RSOA seeded by ultra-narrow spectrum-sliced incoherent light

• A 5.35-Gb/s upstream transmission using an ultra-narrow spectrum-sliced incoherent light source and an RSOA is demonstrated.
• Transmitter de-emphasis is used to compensate for the bandwidth limitation of reflective semiconductor optical amplifier.
• Offset optical filtering technique is exploited to mitigate the excess intensity noise in the spectrum-sliced light source.

We successfully demonstrate 5.35-Gb/s upstream transmission over 20-km standard single-mode fiber using an ultra-narrow spectrum-sliced incoherent light source and a reflective semiconductor optical amplifier (RSOA) without any dispersion compensation. The offset optical filtering and transmitter de-emphasis are exploited to reduce the excess intensity noise of the light source and to overcome the bandwidth limitation of the 1.4-GHz-bandwidth RSOA, respectively. Thanks to these two techniques and narrow linewidth of the source, we achieve the uncorrected bit-error rate of <10−3 after the transmission. The acceptable range of RSOA injection power is also investigated through experiment.