See It Live at CIOE 2026 — Shenzhen, September 9–11
RobustMotion will exhibit at the 27th China International Optoelectronic Exposition (CIOE), the world’s largest photonics industry event — 4,000+ exhibitors, 150,000+ professional visitors, with the optical communication halls (9–13) and laser & intelligent manufacturing halls (2–4) covering the entire optoelectronic manufacturing chain.
At Booth 2A061 (Hall 2, Laser & Intelligent Manufacturing):
- Live demo 1 — Lens-attach force control: watch a SoftForce® actuator place and hold an optical lens with the force-position curve projected in real time — see ±0.01N, zero overshoot, with your own eyes.
- Live demo 2 — MagiFloater® planar maglev transport: independent movers routing freely on a modular maglev track — contactless, zero-particle transport for optical workpieces, mixed-flow scheduling for 800G/1.6T concurrent lines.
Book a technical discussion at the booth →
Bring your process parameters; our engineers will map them against the force-control matrix on-site.
The 800G/1.6T Ramp Is Exposing a Force-Control Crisis
AI data centers are driving the fastest optical module ramp in history: 2026 shipments of 800G transceivers are expected to exceed 40 million units, and 1.6T enters volume production — a single NVIDIA GB200 rack consumes 162 units of 1.6T modules. Every module travels the COB route: die bonding, wire bonding, optical coupling, adhesive curing, burn-in/test.
What the ramp exposes: the industry’s force-control infrastructure was never built for this volume-precision combination. When monthly output grows 10× while die shrink and lens tolerances tighten, the ±1% force scatter that was survivable at pilot scale becomes a permanent tax on yield. Module makers report the same pattern: modules that pass every electrical test still show coupling-efficiency scatter of several dB between “identical” units — and the scatter traces back, step by step, to contact force at three moments in the process.
Where Force Decides Optical Performance: The Full Process Map
Force is not one step in optical packaging — it is the invisible hand at six of them:
1. Die bonding — the thermal interface is a force product
Laser, TIA, and driver chips attach with conductive adhesive; force before cure sets bondline thickness and thermal contact. Excess force: micro-cracks, adhesive squeeze-out, latent field failures months later. Insufficient force: voids, poor heat dissipation, early degradation. On 0.1mm-class die, ±10% force variation is invisible at final test — and visible in the field failure queue.
2. Wire-bonding carrier transport — every vibration is a force event
Between die bond and wire bond, carriers travel on belts and chains whose mechanical vibration transmits through the PCB into freshly bonded die. A bond that survived placement can be quietly damaged in transit — the intermittent failure no one can reproduce on the bench.
3. Lens attach — the #1 source of coupling-efficiency scatter
The coupling lens tacks above the PCB with UV adhesive, folding VCSEL light into a parallel beam. Force variation during attach changes bondline thickness and shifts the optical axis. The industry treats coupling scatter as a component-tolerance problem; in mature lines, the dominant residual is placement-force scatter. Two modules built from the same batch, same machine, same recipe — different optical power. The scatter walks straight into bin-splitting losses.
4. Cure hold — 30 seconds that decide the module’s bin
As UV and thermal adhesives shrink during cure, any drift in holding force lets the lens drift with them. A module that aligned perfectly loses alignment in the oven — and drops one performance bin, which at 800G volumes is a direct revenue number, not a statistic.
5. Burn-in & test transport — the throughput bottleneck hiding in plain sight
Burn-in runs hours; optical test runs 30 seconds. On a fixed-speed conveyor, the whole line moves at the slowest average — capital sitting idle while testers wait. And OK/NG diversion on mechanical lines means contact handling of modules that just passed every cleanliness test.
6. Final assembly & lens-barrel press-fit — stress you can’t un-press
In multi-element lens stacks, each element press-fits with its own seating signature. Excess or uneven pressure induces stress birefringence — image quality degrades in a way no downstream test can repair, only detect.
The Numbers: Three Architectures, Three Outcomes
| Parameter | Current-Loop | External Sensor + Controller | Closed-Loop (SoftForce®) |
|---|---|---|---|
| Force accuracy | ±5–15% | ~1% | ±0.01N (≈0.1%) |
| Loop frequency | none (open loop) | ~100 Hz | 10,000 Hz |
| Touch-down overshoot | uncontrolled | common | zero |
| 5,000-cycle force variation | ±13N | not published | ±0.1N |
In production terms: external-controller systems typically stabilize precision connector-insertion processes at 90–95% first-pass yield. Closed-loop force control — adjusting force and posture in real time — consistently exceeds 99.5%. In one documented application, replacing a 100 Hz servo-press with a 10,000 Hz SoftForce® system cut a 6-second cycle to 1.5 seconds: 4× throughput with no trade-off between speed and stability. At 40M modules a year, the gap between 95% and 99.5% first-pass yield is on the order of 1.8 million modules — every point of force-control precision is worth more than most component-cost programs.
For the architectural why behind these numbers, see Closed-Loop Force Control Explained: Why ±0.01N Accuracy Is an Architecture Problem.
Every Force Curve Is a Quality Record
A 10,000 Hz closed loop produces a high-resolution force-position curve for every operation — every die, every lens, every cure. When a customer returns a failed module, the force curve of its lens attach answers a question no amount of electrical retesting can: was it assembled right? Process engineers watch signatures drift and intercept trends before scrap. In an industry where one dust particle scraps a lens, proving — not assuming — the right force was applied is a new class of process control.
Beyond Force: The Particle Problem Nobody Budgets For
Force control governs what happens at each station. Between stations, a second, quieter yield killer: particles. Belt and chain conveyors shed wear particles with every revolution — onto the exact optical facets the process exists to protect. Cleanroom costs are budgeted in millions for air handling and gowns, while the conveyor running through the line deposits particles by design. Planar magnetic levitation transport changes the physics at the source: movers levitate with zero contact, zero wear, zero particles, no lubrication, each running its own software-defined route. For lines running 800G and 1.6T concurrently, independent routing makes changeover a software update, not mechanical rework. See MagiFloater® — live at CIOE Booth 2A061.
FAQ
Q1: Why does placement force affect optical coupling efficiency?
The coupling lens is tacked with UV adhesive. Force variation during attach changes bondline thickness and shifts the optical axis — modules with identical components and recipe end up with measurably different coupling efficiency. In mature lines, placement-force scatter is the dominant residual.
Q2: What force accuracy do optical module processes require?
Precision steps (die attach, lens attach, cure hold) operate in the 0.1–1% band — sub-newton control for most optical components, beyond open-loop current estimation and general-purpose control loops.
Q3: How does 10,000 Hz force control improve cycle time?
High bandwidth completes contact–sense–adjust within the cycle: soft landing, instant force lock, immediate release. Documented: 6 s → 1.5 s per cycle (4×) with zero overshoot at speed.
Q4: How much does a 1% force improvement matter at 800G volumes?
At 40M modules/year, moving first-pass yield from 95% to 99.5% saves ~1.8M modules of rework and scrap — force-control precision outperforms most component-cost-reduction programs on pure ROI.
Q5: What is the cleanest way to transport optical modules between stations?
Contactless planar maglev transport: no belts, no chains, no wear particles, lubrication-free — intrinsically cleanroom-compatible, with ±0.02mm positioning to dock directly with test stations.
Q6: Can force curves be used for quality traceability?
Yes. Every operation generates a force-position-time record; deviations from the learned seating signature flag suspect parts in-line — and answer field-failure investigations retroactively.