3.2-Tb/s (40 ch x 80 Gb/s) transmission with spectral efficiency of 0.8 b/s/Hz over 21 x 100 km of dispersion-managed high local dispersion fiber using all-Raman amplified spans

Dispersion compensating fiber used as a transmission fiber: inverse/reverse dispersion fiber

“…For example, dispersion deviation was ±0.05 ps/nm/km over the whole C-band. Using new SMF-E plus IDF-45E type fiber, many experimental transmission results have been reported, and high performance was confirmed with SMF-E plus IDF-E [33][34][35][36][37][38][39][40][41][42]. The aggregate of 10 and 40 Gb/s transmission experimental results reported in ECOC'03 and OFC'04 are summarized in Fig.…”

“…39. Attenuation loss spectrum of P-MDF SD No.1 41 shows the wavelength dependence of dispersion and attenuation. As shown in Fig.…”

Transmission of 80 Gbit∕s over 840 km in standard fibre without polarisation control

“…Introduction: At speeds of up to 40 Gbit=s, there has been a significant effort to conduct laboratory transmission experiments that accurately simulate the polarisation effects that occur in deployed fibre systems. In contrast, many of the ground-breaking high-speed optical-time-division multiplexed (OTDM) transmission experiments have implicitly required manual polarisation control either after the transmitter or before the receiver [1][2][3][4][5]. One reason for this discrepancy is that many of the optical clock recovery and demultiplexing schemes used at speeds of beyond 40 Gbit=s are polarisation-dependent and therefore require an established input polarisation state at the receiver.…”

“…One reason for this discrepancy is that many of the optical clock recovery and demultiplexing schemes used at speeds of beyond 40 Gbit=s are polarisation-dependent and therefore require an established input polarisation state at the receiver. Also, because of the stringent requirement on fibre dispersion, OTDM experiments often use polarisation-interleaved multiplexing [4] and sometimes polarisation based demultiplexing to mitigate intersymbol interference that would otherwise result from uncompensated dispersion. Finally, to overcome the effects of PMD and PDL, many high-speed systems require that the signal be launched along a principal polarisation state of the fibre [5].…”