Abstract
In this Letter, an efficient bidirectional differential phase-shift keying
(DPSK)—DPSK transmission for a ultra-dense wavelength division-multiplexed passive
optical network is proposed. A single distributed feedback laser at the optical network
unit (ONU) is used both as the local laser for downlink coherent detection and the
optical carrier for uplink. Phase-shift keying is generated using a low-cost reflective
semiconductor optical amplifier (RSOA) at the ONU. The RSOA chip has the bandwidth of
4.7 GHz at the maximum input power and bias current. For uplink transmission, the
sensitivity of the RSOA chip reaches −48.2 dBm at the level of bit error
rate=10−3 for back-to-back, and the penalty for 50 km transmission is less
than 1 dB when using polarization diversity.
© 2016 Chinese Laser Press
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