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Part 1: 7nm coherent DSPs, ZR and ZR+
The era of 400-gigabit coherent pluggable modules has moved a step closer with Inphi’s announcement of its Canopus coherent digital signal processor (DSP) and its QSFP-DD ColorZ II optical module.
NeoPhotonics has also entered the fray, delivering first samples of its 400-gigabit ClearLight CFP2-DCO module that uses the Canopus DSP.
Pranay AiyaThe ColorZ II and ClearLight modules support the 400ZR OIF standard used to link data centres up to 120km apart. They also support extended modes, known as ZR+, that is not standardised.
ZR+’s modes include 400 Gigabit-per-second (Gbps) over distances greater than 400ZR's 120km and lower data rates over metro-regional and long-haul distances.
The announcements of the Canopus DSP and 400-gigabit pluggable coherent modules highlight the approaches being taken for ZR+. Optical module vendors are aligning around particular merchant DSPs such that interoperability exists but only within each camp.
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