Cost-Effective Solution for High-Capacity Unrepeatered Transmission

Abstract

A cost-effective 310-km SSMF unrepeatered optical link employing off-the-shelf EDFAs, 1st-order DRAs, and a ROPA is experimentally demonstrated. An iterative optimization process enabled a 12.8-Tbps net transmission (37.5-GHz spaced 128 channels × 100 Gbps).

Lumped Compensation of Nonlinearities based on Optical Phase Conjugation

“…Consequently, Link1 is 250-km, whereas Link2 is 350-km long in total, and they are both simulated using standard SSFM with an adaptive step size [28], [29], with the impact of PMD and higher order dispersion neglected. These links have been used for recent record transmission performance demonstrations [48]- [50], where the accuracy of the transmission model has also been verified. After traversing the link, the signal is detected using a standard receiver, and processed with a DSP chain.…”

“…The discussed links are optimized with regard to the received SNR of the central channel, and evaluated with and without compensation. It is assumed that every Ramanpumping stage in the systems consists of two equal-power pumps at 1452 nm and 1457 nm, and that each pump can deliver a maximum of 23 dBm power [48]- [50]. The pump powers for the DCF (P p0) and EX2000 (P p1) are included in the optimization process, whereas the backward pumping of the LL-SMF (P p2) and the ROPA gain (R g ) are fixed to 23 dBm and 10 dB, respectively, as they do not significantly impact the symmetry of the system.…”

Forward Raman Amplifier Optimization Using Machine Learning-aided Physical Modeling

“…remote pumping stages and hybrid EDFA-RA for boosting the launch power in e.g. unrepeatered links [8], which are single-span and typically very long. The multi-pump multi-stage example we consider is given in Fig.…”

All-Optical Nonlinear Pre-Compensation of Long-Reach Unrepeatered Systems

“…2. Record transmission performance has been recently reported with such systems [3], [14], [15] . It is composed of 100 km of large effective area fiber (Vascade EX2000), followed by 250 km of low-loss single mode fiber (LL-SMF).…”