Abstract
A quasi-color-free laser diode (QCFLD)-based 60-Gbit/s long-reach (LR) OFDM-PON with dispersion management is demonstrated. After injection locking, the QCFLD achieves an ultimate back-to-back transmission capacity of 60 Gbit/s. After propagating through 25-, 50-, and 75-km single-mode fiber (SMF)-based LR-OFDM-PON, the RF power fading effect induces signal deterioration to inevitably degrade the transmission capacities of the QCFLD at 45, 27, and 21 Gbit/s, respectively. To avoid the RF fading effect, dispersion management is introduced by using different segments of nonzero dispersion-shifted fiber (NZ-DSF) and dispersion compensating fiber (DCF) with corresponding dispersion constants of +5.6 and −5 ps/nm/km, respectively. Using either 25-km NZ-DSF or 25-km DCF enables the OFDM-PON to operate at up to 57 Gbit/s. Combining the 25-km NZ-DSF with the 25-km DCF establishes the near-zero dispersion to effectively support the 50-km LR OFDM-PON up to 51 Gbit/s, which is nearly twice data rate as compared to the 50-km SMF case. For implementing the 75-km LR OFDM-PON, the scenario of 25-km NZ-DSF in connection with 50-km DCF is employed to achieve 48-Gbit/s transmission capacity. In comparison with the same OFDM-PON constructed with 75-km SMF, the achievable data rate is doubled through the synergy of the LR OFDM-PON technology with dispersion management.
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