Chinese optical components for AI data centers Report Interpretation

Overview

This Citi quick-thought report assesses the reported possibility of a US import ban on Chinese-made optical components used in AI data centers. It concludes that the rule would be complex to apply and that the near-term effect on the covered suppliers should be manageable, although the consequences differ by each company’s supply-chain footprint and customer exposure.

Core views

Citi assesses a reported US consideration of an import ban on Chinese-manufactured optical components for AI data centers. The report argues that such a restriction would not be straightforward: seven of the global top 10 optical-transceiver suppliers are Chinese, and they supply more than 50% of high-speed optical modules to major US cloud-service providers. AI-optics supply remains tight, leading Chinese suppliers retain component-security and advanced-product-development advantages, and their cost competitiveness supports cloud providers’ capital-expenditure efficiency. These conditions lead Citi to expect that certain exemptions could apply, while overseas capacity expansion remains the main strategic response for Chinese suppliers. The firm differentiates exposure by production location and business role. Suzhou TFC is viewed as having the lowest direct exposure despite producing almost entirely in China because it supplies passive components rather than finished transceivers; its direct customer is an overseas transceiver company headquartered in Thailand. TFC is also ramping Thailand production. Citi therefore sees any effect as indirect, transmitted through weaker orders from downstream peers if their exports are restricted, and considers the near-term impact manageable. Eoptolink is also considered well insulated. Citi cites approximately 88% Thailand-based revenue in its 2025 annual report, a location facing materially lower tariffs and restrictions, alongside the company’s commitment to expand Thailand production further. Dongshan Precision has greater exposure through its laser and module businesses: about 69.7% of its optical-transceiver facility capacity was in China at end-2025, with the remainder in Taiwan. However, it currently makes US-cloud-provider optical transceivers in Thailand and Taiwan, and targets 35 million units of 800G/1.6T transceiver capacity in 2027, with two-thirds in Thailand and one-third in Taiwan. Citi’s relative impact ranking is TFC (indirect) < Dongshan Precision (laser and modules) < Eoptolink (modules). The principal uncertainty is whether any eventual US policy extends beyond China-made products to Chinese-affiliated production in third countries. Such an extension would weaken the offshore manufacturing buffer that currently supports TFC, Eoptolink and Dongshan Precision. The report also retains company-specific valuation views: Dongshan Precision’s Rmb350 target is derived through sum-of-the-parts valuation across its original business, transceivers, optical chips and AI-PCB operations; Eoptolink’s Rmb701 target uses 20.0x FY27E earnings; and Suzhou TFC’s Rmb419/share target uses 34.3x 2027E earnings, incorporating a potential CPO re-rating but also anticipated cannibalization of its 1.6T/800G business in 2027.

Analysis framework

Citi starts with the proposed policy trigger, then tests its practicality against supplier concentration, supply tightness, technology capability and cost economics. It next compares company exposure through product role, customer route and China versus overseas manufacturing capacity, before setting out company-specific valuation assumptions and downside risks.

Methodology notes

• Industry AnalysisUpstream-Midstream-Downstream Transmission

  Supply-chain transmission analysis

  Citi evaluates how an import restriction could flow from Chinese module makers to downstream transceiver customers and then back to passive-component supplier TFC through softer orders.

• Valuation methodsSOTP (Sum-of-the-Parts) Valuation

  Sum-of-the-parts valuation for Dongshan Precision

  Citi values Dongshan Precision’s original business, optical transceivers, optical chips and AI-PCB operations separately using distinct forward P/E multiples, then combines them into a Rmb350 target price.

• Valuation methodsP/E and PEG Valuation

  Forward P/E target-price valuation

  Citi uses FY27E or 2027E P/E multiples for Eoptolink and Suzhou TFC, adjusting the selected multiple for cycle strength, CPO effects and historical valuation reference points.

Asset mapping & comparison

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

• Dongshan Precision (002384.SZ)

  Covered AI-optics supplier with laser, module, optical-chip and AI-PCB exposure; overseas capacity partly mitigates policy risk.

  Strengths

  US CSP transceivers are produced in Thailand and Taiwan; 2027 capacity plan places two-thirds of 35mn 800G/1.6T units in Thailand.

  Weaknesses

  Approximately 69.7% of optical-transceiver facility capacity was located in China at end-2025.

  Comparison

  Citi ranks its expected policy impact above TFC’s but below Eoptolink’s.

  Risks

  Slower module FPC progress and overseas share gains, weaker Tesla growth, continuing optoelectronic losses, higher material costs and US-China geopolitical risk.

• Eoptolink Technology (300502.SZ)

  Covered optical-module supplier that Citi views as relatively insulated by Thailand-based revenue and production.

  Strengths

  ~88% Thailand-based revenue and further planned Thailand production expansion.

  Weaknesses

  Its module business remains exposed if restrictions reach Chinese-affiliated offshore production.

  Comparison

  Citi ranks Eoptolink as the most affected of the three on geographic and business grounds, while still viewing it as well insulated under the reported policy scope.

  Risks

  Slower data-center investment, weaker China optical-network capex, price competition, slower new-customer expansion, China-US technology disputes and faster CPO deployment.

• Suzhou TFC Optical Communication (300394.SZ)

  Covered passive-component supplier whose potential exposure is indirect through downstream transceiver customers.

  Strengths

  Its direct customer is an overseas transceiver company headquartered in Thailand, and it is ramping Thailand production.

  Weaknesses

  It produces almost entirely in China and could face weaker orders if downstream peers’ exports are curtailed.

  Comparison

  Citi ranks TFC as the least affected because it is a passive-component supplier rather than a finished-module exporter.

  Risks

  Slower new-product development, slower global AI and infrastructure investment, China-US technology disputes, EML or upstream-component constraints, rising competition and delayed CPO deployment.

Key data

• Chinese supplier shareSeven of the global top 10 optical-transceiver suppliers; over 50% of high-speed optical modules supplied to major US CSPsCiti’s basis for arguing that a blanket import rule would be difficult to implement.
• Eoptolink Thailand-based revenue~88%According to the company’s 2025 annual report; supports Citi’s view of lower direct restriction exposure.
• Dongshan Precision China-based transceiver capacity~69.7%As of end-2025; the remaining facility capacity was in Taiwan.
• Dongshan Precision 2027 transceiver-capacity target35mn 800G/1.6T transceiversTwo-thirds targeted from Thailand and one-third from Taiwan.
• Dongshan Precision target priceRmb350Based on SOTP valuation using 15x 2026E P/E, 20x 2027E P/E, 50x 2027E P/E and 25x 2027E P/E across its businesses.
• Eoptolink target priceRmb701Based on 20.0x FY27E P/E, set at 0.5 standard deviations below the five-year historical mean.
• Suzhou TFC target priceRmb419/shareBased on 34.3x 2027E P/E, equal to the stock’s five-year mean.

Impact & implications

Citi’s central implication is that overseas production is the key buffer against the proposed restriction, but that buffer depends on the policy remaining focused on China-made products rather than extending to Chinese-affiliated offshore capacity. The report sees TFC’s exposure as indirect, Eoptolink’s Thailand footprint as protective, and Dongshan Precision’s Taiwan and Thailand production as important for serving US cloud customers.

Risks

• The reported policy could extend to Chinese-affiliated production in third countries, reducing the protection currently provided by Thailand and Taiwan capacity.
• Dongshan Precision faces risks from slower module FPC progress, weaker overseas share gains, Tesla-market competition, optoelectronic losses, material-cost increases and geopolitics.
• Eoptolink faces risks from weaker data-center or China network investment, pricing pressure, slower customer expansion, technology disputes and faster CPO deployment.
• Suzhou TFC faces risks from slower product development, weaker AI infrastructure investment, geopolitical disputes, upstream-component constraints, competition and delayed CPO deployment.

What to watch

• Whether the proposed US restriction is implemented and whether exemptions are granted.
• Whether restrictions apply only to China-made products or also to Chinese-affiliated production in third countries.
• Expansion of Thailand and Taiwan production capacity by the covered suppliers.
• Dongshan Precision’s progress toward its 2027 target of 35mn 800G/1.6T transceiver capacity.