Proposed dual-arm modulator configurations improve wavelength shifting in colorless ONUs, suggesting effective mitigation of backscattering impairment.
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.
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Omella et al. (2009) studied this question.
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