We demonstrate a novel technique that allows effective homodyne optical phase locking to a phase shift keying (PSK) signal with a residual carrier. We exploit 8b10b coding of the signal in order to reduce its low frequency spectral content, suppressing the data-to-phase crosstalk effect. In a transmission experiment on a 10 Gb/s binary PSK signal (8 Gb/s before coding), we achieved transmission over 215 km of dispersion-compensated, installed single-mode fibre, with no penalty compared to back-to-back at a bit error ratio of 10(-3). The proposed solution is applicable to other modulation formats, including multi-level amplitude and/or phase modulation formats.
We present for the first time an experimental characterization of uncooled and polarization-insensitive operations of directly modulated self-seeded Fabry-Pérot laser diodes (FP-LDs) for wavelength division multiplexed passive optical networks (WDM-PONs). Polarization-insensitive operations are achieved through the combination of nonreciprocal optical elements placed both at the FP-LD and the WDM distribution node, which is placed within the PON. Compared to self-seeded reflective semiconductor optical amplifiers, the FP-LDs show narrower emission linewidth, resulting in improved resilience to chromatic dispersion. The 1.25-Gb/s WDM system operation is assessed on 32 channels in the C-band over a 100-GHz grid and in a wide range of ambient temperature (0°C-60°C). The results shown in this letter promote the self-seeded uncooled FP-LDs to a potential candidate for WDM-PON deployments.Index Terms-Fabry-Pérot laser, wavelength division multiplexed passive optical networks (WDM-PONs).
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