Persistent and Widening Supply-Demand Gap for Optical Chips; Bullish on High Demand in AI Optical Module Supply Chain

Overview

This report analyzes the strong tailwinds from global AI compute infrastructure build-out on the optical communications supply chain, based on the latest earnings from Lumentum (LITE) and Coherent (COHR), as well as Corning’s (GLW) investor day. The core conclusion is that surging demand for high-speed optical modules (800G/1.6T) in data center networks is creating severe supply-demand imbalances for upstream optical components (EMLs, CW lasers) and InP substrates—a shortage expected to persist through 2026–2027. Meanwhile, commercialization of new technologies like OCS and CPO is accelerating. Against this backdrop, the report is optimistic about the spillover effect from AI infrastructure momentum to the optical components sector and specifically recommends Chinese optical module leaders with exceptional supply chain control and execution capabilities.

Core views

1. Intensifying optical chip bottlenecks are driving sustained high growth in the optical module market. Both Lumentum and Coherent reported extreme tightness in upstream core components. Lumentum’s March-quarter revenue surged 90% YoY to $808 million, exceeding prior guidance. Management guided Q4 revenue to a midpoint of $985 million, representing a staggering 104.9% YoY growth, driven primarily by strong shipments of high-speed optical modules and new contributions from OCS. Critically, Lumentum noted that EML (Electro-absorption Modulated Laser) revenue doubled sequentially, and external supply pressure remains immense as its internal cloud optical module business begins self-supplying CW lasers. The company expects EML shipments to grow over 50% YoY in the December 2026 quarter, with the current supply-demand gap now exceeding 30%, up from the previous 25–30%. Coherent also delivered strong results, with March-quarter revenue up 27% YoY to $1.806 billion, beating Bloomberg consensus. Its data center segment grew 37% YoY. Management provided solid Q4 guidance of $1.91–2.05 billion and revealed remarkable order visibility: customer orders extend into 2028, with long-term agreements signed through the end of the decade—demonstrating strong continuity in cloud capex. Additionally, Coherent is accelerating capacity expansion for six-inch Indium Phosphide (InP) wafers, having already doubled internal capacity ahead of schedule and targeting another doubling by 2027 to address ongoing shortages. 2. Commercialization of new optical interconnect pathways (OCS/CPO) is accelerating, unlocking new growth opportunities. Beyond upgrades in traditional pluggable optical modules, advances in next-gen optical interconnects are a key highlight. In OCS (Optical Circuit Switching), Lumentum stated progress is largely on track, though limited supply capacity requires customer prioritization; OCS components (e.g., pump lasers) are even tighter than EMLs. Coherent raised its OCS market opportunity estimate to over $4 billion, reflecting broader application scenarios. For CPO (Co-Packaged Optics), both companies confirmed clear mass-production timelines. Lumentum is fulfilling multi-hundred-million-dollar orders for high-power CW lasers for CPO applications, with deliveries starting in H1 2027. Coherent explicitly identified CPO as a >$15 billion incremental market, expecting initial ramp-up in H2 2026 and large-scale volume production by H2 2027. At its investor day, Corning also emphasized the NPO (Near-Packaged Optics) opportunity, projecting a $10 billion market by 2030 through in-box passive photonics solutions. 3. Supply chain dynamics favor leaders with strong sourcing capabilities. Given the supply-demand imbalance and technological evolution, the report sees high industry momentum cascading from 'optical chips → optical components → optical modules → fiber optics.' The hard constraint of optical chip and InP substrate shortages creates a significant industry barrier. In this environment, midstream optical module vendors with stable upstream supply and strong supply chain management will capture the greatest share of industry upside. The report specifically highlights Accelink Technologies (300308 CH), noting its position as the incumbent market leader and its superior execution and supply chain control make it the primary beneficiary of the current shortage cycle. Meanwhile, TFC (300394 CH) stands to benefit from the CPO wave, and YOFC (6869 HK) benefits from active overseas expansion and growing fiber demand in data center backbones.

Analysis framework

The report employs a classic ‘top-down tracking + micro-validation’ industry analysis framework. First, it selects Lumentum and Coherent—two global leaders in optical communications—as observation windows. Positioned upstream, these firms control optical chip and core component capacity; their earnings guidance and capacity plans serve as leading indicators for overall industry health. Second, by cross-referencing earnings call commentary from both companies, the report identifies a consistent signal: the EML/CW laser supply-demand gap is not easing but widening. This ‘consensus expectation’ significantly strengthens the reliability of the conclusions. Finally, it incorporates insights from Corning’s (fiber optics leader) investor day to validate—from a complementary angle (fiber side)—how AI compute build-out is boosting overall optical content. By linking upstream chip shortages, midstream module ramp-ups, and downstream fiber expansion into a coherent narrative, the report derives actionable investment conclusions for specific segments (e.g., module makers with supply chain advantages).

Methodology notes

• Industry/Supply Chain Analysis FrameworkUpstream-Midstream-Downstream Transmission

  Transmission mechanism of industry momentum across the supply chain

  The report analyzes upstream (optical chip) capacity constraints to infer shifts in midstream (optical module) competitive dynamics and downstream (fiber) demand growth. This approach helps readers understand why upstream shortages translate into earnings certainty for select midstream leaders.

• Industry/Supply Chain Analysis FrameworkPenetration S-curve

  Assessing commercialization stage of new technologies (S-curve application)

  The report places technologies like OCS and CPO at distinct development stages: OCS is in rapid ramp-up, while CPO is transitioning from initial volume production to mass adoption. Applying S-curve theory allows precise estimation of each technology’s earnings contribution elasticity in the current and coming years.

• Competitive Strategy FrameworkMoat / competitive advantage

  Supply chain management as a core moat

  In a supply-constrained market, the report argues that demand alone doesn’t guarantee outperformance—access to supply does. Thus, ‘supply chain management’ and ‘execution capability’ are framed as core competitive advantages (moats), explaining why Accelink is seen as the top beneficiary—a resource-access-based competitive lens.

Asset mapping & comparison

Structured mapping from thesis to named assets (strengths, weaknesses, peers, risks).

• Accelink Technologies (300308 CH)

  Primary beneficiary. Global optical module leader, dominant in the 800G/1.6T upgrade cycle.

  Strengths

  Exceptional supply chain management, effectively securing scarce upstream optical chip capacity; strong execution capability to fulfill large customer orders.

  Comparison

  Holds stronger market share and deeper customer integration in high-end optical modules compared to peers.

  Risks

  Geopolitical risks; customer supply chain diversification strategies leading to potential share loss.

• TFC (300394 CH)

  Potential beneficiary. Core supplier of optical engines and passive components, directly benefiting from CPO adoption.

  Strengths

  Deep technical expertise in optical engines and passive components, aligned with CPO/NPO technology trends.

  Comparison

  Its component support capabilities position it as a critical enabler in the emerging CPO ecosystem.

  Risks

  CPO technology adoption slower than expected.

• YOFC (6869 HK)

  Indirect beneficiary. Benefits from rising fiber demand in AI data centers and overseas expansion.

  Strengths

  Actively expanding overseas markets, with comprehensive capacity布局; benefits from global fiber demand recovery.

  Comparison

  Maintains cost and technology advantages in global preform and optical cable manufacturing.

  Risks

  Intensifying overseas competition; raw material price volatility.

Key data

• Lumentum FY26Q4 Revenue Guidance Midpoint$985 million104.9% YoY growth
• Coherent FY26Q3 Revenue$1.806 billion27% YoY growth, beat expectations
• EML Optical Chip Supply-Demand Gap>30%Widened from 25–30% last quarter; unlikely to ease soon
• OCS Market Opportunity Estimate>$4 billionRevised upward by Coherent
• CPO Incremental Market Size>$15 billionCoherent expects initial ramp in H2 2026, mass production in H2 2027
• Corning’s Expected Increase in GPU Optical Content1.3x – 1.5xEnterprise GPU optical content projected to rise significantly by 2028
• Accelink Target PriceRMB 1,015.00Based on 50x FY27F EPS valuation (Note: cited from chart data; main report text does not specify TP, but chart shows latest TP of RMB 1,015 with Buy rating)

Impact & implications

For investors, this implies the optical communications sector is not a short-term thematic play but a medium-term cyclical upswing backed by solid fundamentals. Structural shortages in upstream chips suggest industry profits may concentrate upstream or at least remain elevated, avoiding rapid erosion from price wars. For midstream module makers, those with stable component access stand to gain both market share and margin expansion. For fiber players, increasing AI cluster scale and bandwidth density will drive structural growth in fiber usage, moving beyond the traditional telecom recovery narrative.

Risks

• Optical component/module demand falls short of expectations
• Major technological shifts in optical communications erode company competitiveness
• Key customers alter strategy or diversify supply chains (de-single-sourcing)
• Geopolitical risks

What to watch

• Capacity expansion progress and gross margin trends for Lumentum and Coherent in upcoming quarters
• Actual deployment scale and pace of OCS and CPO technologies in leading cloud data centers
• Specific optical interconnect requirements in NVIDIA’s next-generation GPU architecture
• Overseas market share changes and new customer wins for Chinese optical module vendors