Abstract
This paper presents a general formulation for the impact of back-reflection
in wavelength division multiplexing-passive optical networks (WDM-PON) access
networks. The analysis is applied to various wavelength-independent optical
network unit (ONU) configurations such as amplified spontaneous emission (ASE)-locked
Fabry–Perot (FP) lasers, reflective semiconductor optical amplifiers
or injection locked FP using the downstream signal. The power penalty due
to beat noise and its dependence on relative intensity noise, transmitter
linewidth, and receiver bandwidth is investigated. The optimal gain at the
ONU that minimizes the effect of beat noise is also found. The results show
that the power penalty decreases as the linewidth of the the optical line
terminal (OLT) and ONU light source increase.
© 2008 IEEE
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