BEYOND 1.6T - PHOTONICS ARCHITECTURE DISCOVERY REPORT
4/15/26
SEQH CAPITAL RESEARCH – TEAR SHEET
BEYOND 1.6T – PHOTONICS ARCHITECTURE DISCOVERY PREVIEW
WHAT THIS REPORT ANSWERS
The report frames photonics as a structural, architecture‑level shift in AI infrastructure rather than a cyclical upturn, arguing that every next‑gen AI cluster will require photonic interconnects and that the key question is now which photonic bottleneck binds first beyond 1.6T, not whether optics wins vs copper.
It maps the next constraints (InP lasers, switch radix, CPO thermals, PIC yield, laser wall‑plug efficiency) and lays out three emerging architectures, CPO‑dominant clusters, optical circuit‑switched fabrics, and RF‑photonics edge fabrics, plus an equity “discovery sleeve” to probe each.
FROM COPPER LIMITS TO PHOTONIC BOTTLENECKS
NVIDIA’s $4B strategic investment in Lumentum and Coherent in March 2026 confirms optical interconnects as a primary AI bottleneck, with McKinsey projecting a 30–40% supply shortfall in 1.6T transceivers through 2029 and only 3–5 global InP EML suppliers.
Once 1.6T pluggables standardize (Q3–Q4 2026 new builds), constraints migrate to:
InP laser supply (demand ~2x supply),
Fiber count (million‑fiber‑class clusters),
Switch radix (512‑port / ~131k‑GPU ceiling),
CPO thermals (500W ASIC next to heat‑sensitive PIC),
PIC yield (30–70% vs >95% CMOS),
Laser wall‑plug efficiency (~10% vs 20%+ targets).
Power‑per‑bit economics strongly favor optics: moving from 16–30 pJ/bit pluggables to ~5 pJ/bit CPO and sub‑2 pJ/bit micro‑ring architectures, with sub‑1 pJ/bit as the next aspirational node.
THREE ARCHITECTURES BEYOND 1.6T
Architecture 1 – CPO‑dominant clusters: Co‑packaged optics migrates the photonic engine onto the switch/GPU package; Broadcom’s TH5/TH6 CPO, NVIDIA’s Quantum‑X Q3450, and TSMC’s COUPE platform underpin this, with Rubin‑era NVLink and Marvell’s Celestial Photonic Fabric targeting optical scale‑up and memory disaggregation.
Architecture 2 – Optical circuit‑switched (OCS) fabrics: Lumentum‑style MEMS OCS flattens topology and escapes electrical radix limits; at hyperscale, OCS can cut fabric power by ~40–80%, remove spines (~40% cost), and boost GPU utilization into the 80–90% range while remaining rate‑agnostic across 800G–3.2T+.
Architecture 3 – Hybrid RF‑photonics edge & SatCom: RF‑photonics links 6G, SatCom, and defense to photonic cores via photonic beamforming and wideband analog links; Sivers (SIVE) bridges Ka‑band/6G RF ICs and DFB lasers for AI optics, sitting at the edge‑core intersection.
EQUITY UNIVERSE – CONVICTION & DISCOVERY SLEEVES
Core conviction: Lumentum (LITE), Coherent (COHR), Marvell (MRVL), and GlobalFoundries (GFS) are highlighted as top‑conviction probes into lasers, CPO, photonic fabrics, and SiPh foundry capacity, with NVIDIA’s $4B split between LITE/COHR and GFS’s Fotonix platform scaling toward $1B+ SiPh revenue by decade‑end.
Discovery sleeves:
CPO core: AVGO, MTSI, AAOI, POET as leverage to 400G‑lane CPO and 1.6T/3.2T modules.
RF‑photonics fabric: SIVE, MKSI, Hamamatsu as enablers of RF‑optical links and SiPh manufacturing.
Optical compute experiments: Lightmatter, Ayar Labs, PsiQuantum, Xanadu, and others as VC‑backed photonic compute/quantum probes still 2-4 years behind interconnect in commercial maturity.
WHAT PAID MEMBERS GET IN THE FULL REPORT
Upgrade to access the full Beyond 1.6T photonics discovery report, including:
A detailed bottleneck map across laser supply, fiber count, switch radix, CPO thermals, PIC yield, and wall‑plug efficiency, plus power‑per‑bit and lane‑rate (200G→400G) roadmaps.
Deep dives on the three post‑1.6T architectures (CPO clusters, OCS fabrics, RF‑photonics edge), with timelines, hyperscaler deployments, and economics for each.
An extended photonics equity universe with core ratings, discovery sleeves, and key private names, and a 10‑series measurement plan SEQH will track over the next 12–18 months to turn these open questions into investable theses.
Q2 / EASTER PROMO – 20% OFF YEARLY FOR LIFE
For investors who want ongoing access to our photonics, AI‑infrastructure, and nuclear/energy thematic work, we’re running a limited Q2 / Easter promotion on our yearly subscription:
20% discount on the annual plan.
Locked “for life” as long as the subscription remains active.
Applies to all premium photonics, AI‑infrastructure, and energy research going forward.
You can activate the promo and lock in the lifetime discount here:
CLICK FOR Q2 PROMO LINK
FULL 13-PAGE PHOTONICS DISCOVERY REPORT PDF ATTACHED BELOW:
