Abstract
Wavelength reuse in a symmetric ultra-wideband (UWB) over wavelength-division-multiplexing
passive optical network based on injection locking of a Fabry–Pérot laser diode (FP-LD) and
polarization multiplexing is proposed and experimentally demonstrated. In the proposed scheme, the
downstream UWB signal and baseband signal are generated and polarization multiplexed in the
central station and sent to a base station (BS) over an optical fiber. At the BS, one of the
downstream signals is selected to injection lock the FP-LD. It is demonstrated theoretically and
experimentally that the upstream service performance is less sensitive to the modulation depth of
the downstream UWB signal than the baseband signal, and the use of the downstream UWB signal as
the injection signal would contribute to a better transmission performance for both the downstream
and upstream services. Thus, the downstream UWB signal is selected as the injection signal. An
experiment is performed. When the FP-LD is injection locked by a downstream UWB signal, a clear
optical carrier is generated which is reused for upstream UWB and baseband transmission. A
bidirectional point-to-point transmission of 1.25 Gb/s UWB signal and 10 Gb/s baseband signal over
25-km single-mode fiber using a single wavelength is demonstrated. The bit error rate performances
and the eye diagrams for both downstream and upstream transmissions are measured.
© 2013 IEEE
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