This week the bull case for optical communications got a new spokesperson: Broadcom's income statement instead of analyst decks. Demand is now locked in by earnings, but what's truly scarce can't be bought with earnings: the hardest bottleneck in the chain is a laser in short supply through 2027. The more real the demand, the more valuable the light source.

When the biggest buyer reaches upstream and index providers add optical names to their benchmarks, the industry's capital structure has shifted gears. NVIDIA's $2B stake in Coherent is not an investment; it is supply insurance.

The Big Four CSPs lifted 2026 capex to USD 725B, NVIDIA declared the arrival of agentic AI, and Cisco doubled its AI order outlook. Yet Chinese module makers' "revenue up, profit lagging" signal shows margin in this optical bull run shifting upstream to EML/InP and epitaxy.

MACOM delivered a stunning quarter with book-to-bill hitting a record 1.5. Riding the 1.6T ramp and AI infrastructure build-out, it sharply raised its data center revenue guidance, with optical communications and high-frequency GaN set to drive the next wave of explosive growth.

A not-yet-effective FCC draft rule repriced the optical supply chain in a week: Innolight plunged, Coherent soared over 40%. But the real bottleneck isn't module assembly; it's upstream EML and InP. The policy arbitrage is real, the capacity shift is slower.

From 15 years at 10G to 4 years at 1.6T, the time for a data-rate generation to reach 10 million units has been cut again and again. At ECOC 2026, Lumentum laid out the numbers: half of module power goes to the DSP, only 24% of that DSP computes — and the real volume bottleneck is plugging in fibers.

At 1.6T, choosing IMDD no longer buys you lower power — only shorter reach. With a reach-collapse chart and a standards matrix full of "Undefined," Nokia argues the real 1600G+ problem isn't physics but too many options and an industry slow to converge.

One white paper and one set of monthly revenue figures hide two setups for the second half: China lifted optical modules into national strategy, and Taiwanese revenue split AI optical communications from smartphone optics. Why Largan's weakness is not an alarm for optical communications.

Innolight beat its full-year 2025 revenue and profit in just six months, with gross margin up 6.63 points to 46.59%. Yet management spent almost the entire call on 2027: orders, first NPO deliveries and the capacity its HK$53.4 billion raise will build.

It takes fourteen kinds of engineers to build an optical module, and design is only half of them. The free section walks through what each of the fourteen functions does; the four hand-off interfaces that really set the pace of yield ramp are broken down in the paid section.

"OSFP 800G SR8" is not a part number — it is five axes stacked together. Learn form factor, data rate, reach, electrical I/O and light source, and you can read any optical module spec and see why two 800G modules can differ 3x in price. Interactive lookup tool included.

1.6T is a generational shift up from 800G. Tear down both modules side by side: DSP goes from 80 to 130, each light source costs 3-4x more, and SiPh penetration rises from 40-45% to 60%. See where cost jumps, how the bottleneck moves, and who takes the margin.

Optical interconnects are moving from the lab to the factory. NVIDIA and Lumentum have built the first production-ready DWDM laser array, with 7.2% wall-plug efficiency and per-channel power held within ±0.8 dB. More importantly, system-level simulation quantifies what actually drives optical link cost, as copper's ceiling makes the alternative an economic necessity.

Taiwan's optical stocks hit limit-up on Oct 2, but the Senate bill and the reported FCC route are two different paths. The 3.2T start line and the 65% US-BOM threshold decide who wins orders, and when.

A roundup of the 800G optical market and its specifications, covering 8x100G short-reach and 4x200G long-reach scenarios, modulation, packaging and FEC choices, IEEE progress from 200G to 1.6T, QSFP-DD800 updates and optical connector interfaces.

A walk through a silicon photonics optical module from Tx to Rx: every core component, the key interfaces between them, and how Intel, NVIDIA, Broadcom, TSMC and DustPhotonics make different design choices on the road from pluggables to LPO and CPO.