APPLICATIONS for aggregation
Aggregation OpenZR+ + Muxponder
Another area in the network where QSFP-DD DCO modules can be effectively utilized is aggregation. In these scenarios, we often encounter limited availability of QSFP-DD ports, especially in aggregation nodes where QSFP28 ports are more common.
The standardization of these technologies allows us to overcome this challenge. On the core network side, where 400G ports are readily available, we can install the QSFP-DD module directly into a switch or router, selecting the 4x100G application on the host side. On the aggregation side, a muxponder is installed, providing 4 independent 100G ports or, soon, up to 8 independent 100G ports.
Additionally, the muxponder's client ports can accommodate not only short-range modules like 100G LR4 or LR1 but also 100G ER4/ZR4 modules and QSFP28 DCO modules. This solution can significantly extend the lifespan of aggregation devices by postponing the need for migration to higher bandwidths.
Long Haul OpenZR+ -> 200G QPSK / 100G QPSK
Transponder aggregation, line-side modes.
Transponder aggregation and line-side modes are crucial for long-haul applications. The MSA OpenZR+ standard defines various modes, including 300G, 200G, and 100G on the line side. These modes allow QSFP-DD DCO 400G modules to achieve much longer ranges than the typical 600 km (OSNR 23dB) associated with 400G links. This capability enables the connection of switches or routers over extended distances without the need for signal regeneration.
Additionally, a version of the 400G transceiver with 8QAM modulation, supporting even longer distances, will soon be available. This advancement will further enhance the reach and flexibility of long-haul network connections.
Ultra Long Haul - Super Channel
Compact solutions, such as QSFP-DD modules, are leading the way in terms of range and transmission speed for ultra-long-haul applications. While successive generations of coherent optics have increased throughput per optical module, improvements in spectral efficiency have been more modest. Increasing the BaudRate, while boosting data rates, also raises the requirements for network quality, particularly in terms of the acceptable OSNR (Optical Signal-to-Noise Ratio) level.
At Salumanus, we have already conducted tests on coherent transmission using modules compliant with the OpenZR+ standard, demonstrating the potential of these technologies in ultra-long-haul networks.