---
title: "400G DR4 Prices Are Moving. Here's What's Actually Happening."
type: market_alert
audience: network_architects_technical_buyers
quality_score: 9
generated_by: claude-sonnet-4-20250514
generated_at: 2026-04-06
training_data: true
---

The quotes landing in inboxes right now look different from six months ago. 400G DR4 pricing has been shifting, and not uniformly — the moves are happening at the vendor level, not the market level, which means what you're seeing depends entirely on who you're asking.

That distinction matters more than the number itself.

For the last two years, the dominant pattern in 400G DR4 was simple: OEM pricing from Cisco, Arista, and Juniper stayed high, while the compatible market — Flexoptix, FS.com, ProLabs — followed a different curve. The gap was already significant. What's changed is where that gap has settled, and whether it's likely to hold.

The driver isn't silicon scarcity anymore. 400G QSFP-DD chipsets are no longer a bottleneck at the fab level. The constraint that kept 400G expensive in 2023 — limited VCSEL array capacity for the parallel lanes, plus yields on the DSP side — has worked itself out. Production has caught up. The yield curves on DR4 modules are now comparable to what SR4 looked like at the 100G ramp in 2018.

What that means in practice: compatible 400G DR4 is now manufactured at enough volume that pricing pressure from within that market is real. Vendors aren't cutting margins out of generosity. They're responding to supply that's structurally different from two years ago.

The OEM side hasn't moved equivalently. It rarely does at this phase. The OEM model doesn't reset pricing based on component costs — it resets based on attach rate to hardware, competitive pressure from specific accounts, and whether the RFP in question has someone who actually checked the compatibility list. That last one is more common than it used to be.

Where this creates a real operational decision: the window for infrastructure builds where 400G DR4 at OEM pricing makes financial sense is narrowing. Not because compatible quality has improved in some abstract sense — it hasn't changed, the specs haven't changed, the qualification testing hasn't changed. The window is narrowing because the cost delta is now visible enough that procurement teams are asking the question, which they weren't consistently doing eighteen months ago.

The question is usually the wrong one. "Is compatible 400G DR4 as good as OEM?" misses the actual risk surface. The real question is whether the deployment infrastructure around the module is set up to handle what 400G DR4 actually requires — and that's a question that applies to OEM modules too.

DR4 is not SR4 at a higher speed. The move from multimode to singlemode changes everything about your margin stack. At 400G, a contaminated end-face on an MPO-12 connector doesn't just degrade performance — it can take a lane offline without triggering a clean link-down event. You get partial link failures, asymmetric BER across lanes, behavior that's genuinely hard to diagnose if you're not looking for it.

This isn't an argument against compatible optics. It's an argument that the deployment validation process needs to match the technology, and that doesn't change based on vendor or price point. An OEM module in a dirty MPO with a poor mating sleeve behaves identically to a compatible module in the same condition. The fiber plant doesn't know who made the transceiver.

The shift happening now is that buyers who do have that process in place — clean fiber, verified end-faces, proper OTDR traces on the backbone, structured commissioning — are accelerating their 400G DR4 procurement cycles. Because when you trust your infrastructure, the delta between OEM and compatible is just money.

The buyers who don't have that process in place are slower to move regardless of pricing. That's not a market timing problem. That's a readiness problem.

Current pricing levels in the compatible market represent a floor that's likely stable for 12-18 months, not a temporary dip. The conditions that create price floors at a technology maturity level — broad supplier base, no single-vendor component dependencies, well-established qualification processes — are all present for 400G DR4. That's not speculation; it's the same pattern that played out in 10G SFP+, 40G QSFP+, and 100G QSFP28 at equivalent points in their cycles.

The one variable that can move this: if demand for 800G accelerates faster than expected, some of the manufacturing capacity currently allocated to 400G modules shifts. That would tighten supply briefly and reset pricing upward. Right now that scenario is possible but not the base case — 800G is growing in hyperscale but the enterprise and service provider 400G wave hasn't peaked.

For anyone sitting on a planned 400G DR4 deployment that's been waiting for budget cycles or vendor qualification timelines: the pricing argument for moving now is as strong as it's been. The infrastructure argument for doing your fiber validation before you deploy is the same as it's always been.

Those two things aren't in conflict.
