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Full-Duplex 4-PAM Transmission for Capacity Upgrade in Loop-Back PONs

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5 Author(s)
Lazarou, I. ; Photonics Communications Research Laboratory, National Technical University of Athens, Athens, Greece ; Dris, S. ; Bakopoulos, P. ; Schrenk, B.
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We report for the first time on the feasibility of quaternary (4-ary) pulse amplitude modulation (4-PAM) for both downstream (DS) and upstream (US) directions in a full-duplex passive optical network (PON) with wavelength reuse. The scheme is validated with a simple, low-cost, and colorless optical network unit (ONU) exploiting the all-optical carrier recovery scheme. The ONU employs a high-finesse optical filter with periodic frequency response for carrier extraction and data erasure of the DS signal. A cascade of two semiconductor optical amplifiers (SOAs) amplifies and modulates the recovered carrier with the 4-PAM US data-stream. The proposed scheme constitutes a migration scenario towards low-cost TDM/WDM PONs with currently deployed hardware equipment, ensuring full-duplex transmission up to 26 km, with higher spectral efficiencies and auspicious wavelength allocation.

Published in:

Photonics Technology Letters, IEEE  (Volume:25 ,  Issue: 12 )