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Several years ago, hyperscale network operators saw an opportunity for coherent Dense Wavelength Division Multiplexing (DWDM) transport optics to plug directly into routers for 400 Gbps Data Center Interconnections (DCIs) with reaches up to 120km. This point-to-point, IP-over-DWDM architecture would eliminate the need for external optical transmission systems thus saving capital and operating expenses.

A core principle of OpenZR+ is to foster multi-vendor interoperability to cultivate healthy competition in the industry. This not only bolsters network reliability and resilience, but also facilitates the creation of a more versatile and adaptive network infrastructure. Additionally, OpenZR+ is dedicated to specify solutions that operate in real-world scenarios. To validate the efficacy of the 400G OpenZR+ solution, the OpenZR+ MSA group conducted Phase 1 and Phase 2 test events at LightRiver. The test results were successful in showing compatibility to the OpenZR+ specification and interoperability between optical transceiver modules from different vendors in two different routers by transporting 400 Gb/s traffic over various optical links.

OpenZR+ MSA provides a digital coherent optic transceiver that can be plugged into a range of routing, switching, or optical transport host platforms. With 400G, 300G, 200G, and 100G modes, long-haul applications can also be addressed. The 4x 00GE multiplexing mode allows for the connecting of 400GE- and 100GE-capable devices across a DWDM link.