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We extensively discuss 25 Gb/s per wavelength capacity in both IEEE and ITU-T standardization to support the increasing bandwidth requirement. In this Letter, we propose to use the optical dispersion compensation technique in an optical line terminal(OLT) combined with a bandwidth-limited electro-absorption modulated laser in an optical network unit to achieve 25 Gb/s capacity for the upstream link. We evaluate the positive and negative dispersion tolerances of 25 Gb/s electrical duo-binary(EDB) and pulse-amplitude modulation(PAM-4) signals. We achieve 39.5 and 31 d B upstream loss budgets for the 25 Gb/s EDB and PAM-4 signals by using-600 and-500 ps∕nm optical dispersion compensation in OLT, respectively, both supporting 0–40 km differential reach.
In this Letter, we propose to use the optical dispersion compensation technique in an optical line terminal (OLT) combined with a bandwidth -limited electro-absorption modulated laser in an optical network unit to achieve 25 Gb / s capacity for the upstream link. We evaluate the positive and negative dispersion tolerances of 25 Gb / s electrical duo-binary (EDB) and pulse-amplitude modulation PAM-4) signals. We achieve 39.5 and 31 d B upstream loss budgets for the 25 Gb / s EDB and PAM-4 signals by using-600 and-500 ps / nm optical dispersion compensation in OLT, respectively, 40 km differential reach.