Coherent 1.6T OSFP Optical Transceiver — 200G per Lane AI Datacenter Module

Specifications

Overview

Coherent's 1.6T OSFP module is the vertically integrated option in the 1.6T optical market: the company builds its own CW lasers, EMLs and photodetectors, so the module is not dependent on a third-party optical supply chain. The portfolio deliberately spans three architectures — fully retimed, transmit-retimed (LRO) and linear pluggable (LPO) — because AI fabric operators are splitting on how much DSP they want in the module.

The LPO configuration is the interesting one for power-constrained racks. By removing the module-side DSP and letting the host switch ASIC drive the optics directly, Coherent demonstrated a live 200G-per-lane link at roughly 10–12 W with a BER around 8 × 10⁻¹⁰. That is a materially lower power and latency point than a retimed module, at the cost of tighter host-side equalisation requirements and a more constrained set of supported switch platforms.

Coherent's position in AI datacenter optics was reinforced in March 2026 when NVIDIA announced strategic partnerships with Coherent and Lumentum to accelerate advanced optics development. QS Compute supplies Coherent 1.6T modules alongside the compatible third-party OSFP224 portfolio, so mixed retimed/LPO builds can be sourced on one order.

Key Benefits

Vertical integration — in-house CW lasers, EMLs and photodetectors reduce supply-chain exposure in an allocation-constrained market. Three architectures from one vendor lets you standardise the optical vendor while still choosing retimed or LPO per rack. 10–12 W LPO cuts module power at the rack level, and no module DSP removes a latency stage from the fabric path.

Applications

1.6T scale-out fabric between AI switch tiers; switch-to-NIC links in liquid-cooled and air-cooled racks where per-module power budgets are binding; and multi-vendor builds where a single optical supplier must cover both retimed and linear designs.

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