Abstract
Dual-arm modulator configurations to perform wavelength shifting at
the optical network units (ONUs) for the mitigation of Rayleigh backscattering
impairment in bidirectional centralized-light passive optical networks (PONs)
are proposed, with different solutions compared. A 7 dB of sensitivity improvement
due to the reduction in the Rayleigh scattering crosstalk between up- and
down-stream signals is achieved with a suboptimal solution based on a conventional
Mach–Zenhder modulator.
© 2009 IEEE
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