IEC Draft: 6G Sub-THz Optical Modules Must Pass mmWave EMI Coexistence Testing

On 1 May 2026, the International Electrotechnical Commission (IEC) Technical Committee 48 released the draft proposal IEC 63297 ED1:2026 CDV, introducing mandatory electromagnetic interference (EMI) coexistence testing for sub-terahertz (0.1–0.3 THz) optical modules in multi-band operational environments. This development is highly relevant to manufacturers of high-frequency optical interconnects, 6G infrastructure suppliers, and satellite terminal integrators—particularly those engaged in export supply chains to European and North American telecom equipment vendors.

Event Overview

On 1 May 2026, IEC TC48 published the Committee Draft for Vote (CDV) IEC 63297 ED1:2026. The draft establishes EMI mutual interference assessment as a required evaluation item for sub-terahertz optical modules operating alongside millimeter-wave systems. It specifies test requirements for EMI coexistence under multi-frequency co-location scenarios. The document is scheduled to enter the Draft International Standard (DIS) voting stage in Q3 2026 and is projected to enter into force in early 2027.

Impact on Specific Industry Segments

Optical Module Exporters Supplying to Ericsson and Nokia

These companies face direct technical access barriers if their sub-THz optical modules cannot demonstrate compliance with the new EMI coexistence test methodology. Impact manifests primarily in qualification timelines: modules previously certified only for optical performance or thermal reliability may now require additional EMI characterization across mmWave bands (e.g., 24–47 GHz, 66–71 GHz), delaying type approval and shipment readiness.

Satellite Terminal Integrators Sourcing Sub-THz Interconnects

Integrators deploying sub-THz optical links in low-Earth orbit (LEO) user terminals or gateway systems must verify that upstream optical module suppliers have begun alignment with the CDV’s EMI test framework. Non-compliance risks design rework late in integration cycles, especially where RF front-end and optical backplane components share compact enclosures.

EMI Test Laboratory Service Providers

Laboratories accredited for IEC/EN 61000-series EMC testing will need to validate and document measurement capability for 0.1–0.3 THz optical emissions coupling into mmWave receiver bands—a scenario not covered by existing standard test setups. Impact includes required upgrades to instrumentation (e.g., calibrated THz photonic probes, mmWave spectrum analyzers with phase-synchronized triggers) and development of traceable test fixtures.

What Relevant Enterprises or Practitioners Should Focus On Now

Monitor official IEC TC48 communications and national committee comments

The CDV phase allows national committees to submit formal comments until mid-July 2026. Responses from major delegations—including China’s SAC/TC48, Germany’s DKE, and the U.S. ANSI-accredited NCIC—will indicate whether key technical provisions (e.g., test distance, modulation-aware emission limits) are likely to be retained in the DIS version.

Identify and prioritize modules deployed in baseband-RF co-integrated platforms

Modules used in integrated radio units (IRUs) or active antenna systems (AAS) where optical fronthaul interfaces reside within 10 cm of mmWave power amplifiers or antenna arrays are at highest immediate risk. Firms should map current product families against such deployment topologies to triage validation effort.

Distinguish between regulatory signal and enforceable requirement

This remains a draft proposal—not a ratified standard. While adoption is probable given IEC TC48’s mandate and alignment with 3GPP/ITU-R studies on 6G coexistence, no legal or contractual obligation arises until publication as an International Standard (IS). Contracts referencing “IEC compliance” should be reviewed for scope ambiguity.

Initiate internal cross-functional alignment between optical design, RF engineering, and compliance teams

Early-stage coordination helps identify feasible mitigation paths—for example, optical carrier suppression schemes, shielded hybrid packaging, or time-domain gating during mmWave transmission windows. Waiting until DIS confirmation may compress time available for design iteration.

Editorial Perspective / Industry Observation

Observably, this CDV signals a structural shift: EMI assessment for optical components is moving beyond legacy radiated/conducted emission limits into dynamic, system-level coexistence verification. Analysis shows it reflects growing recognition that photonic devices—once considered electromagnetically benign—are now sources of broadband noise capable of disrupting adjacent RF receivers when modulated at THz rates. From an industry perspective, this is less a finalized barrier and more a forward-looking calibration point—indicating how interoperability assurance will evolve for 6G infrastructure. Continuous tracking is warranted not because compliance is imminent, but because test methodology development is already influencing R&D roadmaps.

This initiative does not yet constitute a market access requirement, nor does it invalidate existing designs. Rather, it defines an emerging benchmark for next-generation optical interconnects operating in spectrally dense, multi-technology environments. Current understanding should treat it as a technical anticipation—not a compliance deadline.

Information Source: IEC TC48 Secretariat, IEC 63297 ED1:2026 CDV (published 1 May 2026). Note: Final text, DIS timeline, and national committee feedback remain subject to ongoing IEC procedural review.