China’s Ministry of Commerce has extended anti-dumping duties of 7.4 to 30.6 percent on Indian single-mode optical fibre for a further five years, prolonging one of the longest-running trade remedy disputes between the two Asian giants into its second decade.
BEIJING, August 14, 2026 China’s anti-dumping duties on single-mode optical fibre from India entered a new five-year term on Friday, after the Ministry of Commerce (MOFCOM) ruled that scrapping the measures would likely revive both the dumping of Indian fibre into the Chinese market and the injury it causes to domestic producers. The decision, announced by the ministry on Thursday and taking effect on August 14, concludes an expiry review, commonly known as a sunset review, that was launched in August 2025 at the request of China’s domestic optical fibre industry. It means that a trade remedy first imposed in August 2014, and already renewed once in 2020, will now remain in place until at least 2031, assuming no interim review changes course.
According to the MOFCOM statement, as reported by the Global Times, importers bringing single-mode optical fibre originating in India into China must continue to pay anti-dumping duties to Chinese customs at rates ranging from 7.4 percent to 30.6 percent, unchanged from the levels set in earlier rulings. Reuters reported that the company-specific structure of the duties also carries over: Sterlite Technologies, India’s largest optical fibre maker, remains subject to the lowest rate of 7.4 percent, while Aksh Optifibre and Finolex Cables each face the maximum rate of 30.6 percent.
The extension is, on its face, a routine administrative outcome. Sunset reviews that end in continuation are the norm in most major trade remedy jurisdictions, and China’s finding follows the standard legal test under its own Anti-Dumping Regulation and Article 11.3 of the World Trade Organization’s Anti-Dumping Agreement: whether expiry would likely lead to the continuation or recurrence of dumping and injury. But the timing and the product give the decision a resonance beyond the technical. Single-mode optical fibre is the backbone medium of modern telecommunications, and the ruling lands at a moment when Beijing and New Delhi are otherwise working to steady a commercial relationship that has been through years of turbulence.
The Ruling: Rates, Scope and Findings
The MOFCOM determination rests on a likelihood analysis rather than a fresh finding of current dumping. The ministry ruled that, if the anti-dumping measures were terminated, dumping of single-mode optical fibre originating in India and imported into China “would likely continue or recur,” and that the injury caused to China’s single-mode optical fibre industry would likewise be likely to continue or recur, according to the ministry’s statement carried by the Global Times.
Two strands of evidence in the ministry’s published reasoning stand out. The first concerns India’s own market. According to the MOFCOM review document cited by the Global Times, overall demand for single-mode optical fibre in India is on a downward trend and remains far below the country’s production capacity and output. By the ministry’s account, more than 60 percent of India’s annual single-mode optical fibre production capacity must be channelled to international markets each year, a structural export dependence that, in Beijing’s reading, creates a persistent incentive to sell abroad at aggressive prices whenever domestic absorption falls short.
The second strand concerns the pull of the Chinese market itself. China is the world’s largest single-mode optical fibre market, accounting for an average of more than 50 percent of global demand between 2021 and 2025, according to the same MOFCOM document. The ministry argued that if the duties lapsed, Indian producers could divert exports currently destined for other markets toward China, given the sheer size of Chinese demand and the price sensitivity of the product. In trade remedy practice, this combination of exportable surplus in the exporting country and an attractive, open market in the importing country is the classic template for a finding that dumping would recur.
On process, MOFCOM emphasised that the review was conducted transparently and that all interested parties had an opportunity to be heard. The ministry said on July 9 that the investigating authority had disclosed to all interested parties the essential facts on which the ruling would be based and invited comments. No submissions were received by the deadline, according to the ministry’s account reported by the Global Times. With Indian exporters largely priced out of the Chinese market after twelve years of duties, few firms appear to have judged contesting the review worth the cost.
The product scope remains single-mode optical fibre, the ultra-pure glass strands that carry laser light over long distances with minimal loss. As the Global Times noted, it is the core medium for high-speed, long-distance telecommunications, widely used in long-haul trunk lines, metropolitan area networks and cable television systems. It is distinct from multimode fibre, used mainly for short-reach connections inside data centres and buildings, and from finished optical fibre cable, which is subject to separate trade measures in several jurisdictions.
Background: Twelve Years of Duties, Two Renewals
The measure now entering its third five-year term dates to August 2014, when China first imposed anti-dumping duties on Indian single-mode optical fibre at rates between 7.4 percent and 30.6 percent, following an investigation prompted by Chinese producers. At the time, India’s fibre industry, led by Sterlite Technologies, had been expanding capacity rapidly and looking to China’s then-booming fibre-to-the-home construction programme as a natural outlet. Chinese manufacturers, including the large integrated players that dominate the domestic market, complained that Indian fibre was arriving at prices below fair value and undercutting local supply.
The duties were reviewed and extended for a first five-year renewal in 2020, again at the request of the domestic industry, and again with the rates left unchanged. The August 2025 initiation of a second expiry review followed the same pattern: absent a review request, the measures would have lapsed automatically at the five-year mark, so the domestic industry’s petition in August 2025 preserved the duties provisionally while the ministry investigated. Thursday’s announcement completes that cycle within the standard one-year review window.
The continuity of the rates across twelve years is itself telling. Neither the margins nor the company-specific assignments have been recalculated in either renewal, which is permissible in expiry reviews because the legal question is likelihood of recurrence rather than the current magnitude of dumping. Sterlite’s 7.4 percent rate dates to its cooperation in the original investigation; the 30.6 percent applied to Aksh Optifibre and Finolex Cables functions in practice as a near-total bar on the Chinese market.
For most of the past decade, however, the commercial significance of the duties has been limited by market conditions as much as by tariff walls. China’s fibre market is dominated by domestic champions such as Yangtze Optical Fibre and Cable (YOFC), Hengtong, Fiberhome, Futong and Zhongtian Technology, which together control the bulk of domestic supply and are themselves major exporters. Foreign fibre of any origin holds a small share of Chinese consumption. The duties on Indian fibre have therefore operated less as a live constraint on large trade flows and more as insurance against a future surge, which is precisely the framing MOFCOM’s recurrence analysis adopts.
Stakeholder Reactions
Chinese commentary presented the extension as legally unremarkable and consistent with international rules. Qian Feng, director of the research department at Tsinghua University’s National Strategy Institute, told the Global Times that the ruling was “reached through a series of thorough and evidence-based investigations” and represents “a normal market-oriented practice that fully complies with WTO rules.”
Qian was also at pains to insulate the decision from the broader diplomatic context. “Some friction in individual sectors will not alter the underlying logic of the increasingly warming China-India economic and trade relationship,” he told the newspaper, adding that the two economies “are naturally complementary, and this complementarity constitutes a fundamental convergence of interests.” Looking ahead, he said, “so long as each side respects the other’s core industrial concerns, bilateral economic cooperation can continue to advance steadily and send a clear, predictable signal of positive momentum.”
Ma Jihua, a veteran industry analyst, told the Global Times that the measure was necessary under China’s anti-dumping regulation to prevent low-priced Indian fibre from flooding in, disrupting normal market order and damaging the incentive of domestic enterprises to keep upgrading their technology. Ma also cast the decision as reflecting what he called a responsible attitude toward safeguarding the long-term stability and high-quality development of the global optical communications supply chain.
On the Indian side, there was no immediate public reaction from the affected producers or from the Ministry of Commerce and Industry in New Delhi at the time of writing, and Indian coverage of the decision, including reports in Business Standard and Deccan Herald drawing on the Reuters wire, was largely factual. The muted response is consistent with the commercial reality: Indian fibre makers wrote off meaningful access to the Chinese market years ago and have redirected their export focus toward Europe, North America, the Middle East and Africa. Notably, no Indian party filed comments in the review itself, according to MOFCOM’s procedural account, which deprived the review of an adversarial record and made the continuation finding straightforward for the authority to reach.
Tit for Tat: India’s Own Remedies on Fibre from China
The extension cannot be read in isolation from the mirror-image measures India maintains on fibre moving in the opposite direction. In 2023, following an investigation by the Directorate General of Trade Remedies (DGTR), India imposed anti-dumping duties on dispersion unshifted single-mode optical fibre imported from China, South Korea and Indonesia. The petition was filed by Birla Furukawa Fibre Optics, with support from Sterlite Technologies and Corning’s Indian operations, according to contemporaneous reporting by WION and the Digital Watch Observatory.
Indian media reports at the time indicated that the duties were set in absolute terms, ranging from roughly 122 dollars to 857.23 dollars per kilofibre kilometre depending on the producer and country, and were imposed for five years. The measures cover standard G.652-type and bend-insensitive G.657-type single-mode fibre, while excluding specialty variants such as G.653, G.654, G.655 and G.656 fibres, according to trade press reports including Optical Connections News. Those figures and scope details come from reporting on the DGTR’s recommendation and the Finance Ministry’s notification rather than from a primary document reviewed for this article, and should be read with that caveat.
The Indian industry’s argument in that case was a near-perfect inversion of Beijing’s: Chinese fibre capacity vastly exceeds Chinese demand, Chinese prices collapsed after a domestic demand slowdown from 2019 onward, and surplus Chinese fibre was being exported at prices Indian producers could not match. Both governments, in other words, have accepted essentially the same economic diagnosis, a global glut of fibre-making capacity concentrated in Asia, and each has used trade remedies to wall off its home market from the other’s surplus.
Nor are China and India alone. The European Union imposed anti-dumping duties on optical fibre cables from China in 2021, added countervailing duties in 2022, and later roughly doubled the anti-dumping rates after finding that Chinese exporters had absorbed the original duties, according to European Commission implementing regulations. The United Kingdom’s Trade Remedies Authority maintains its own anti-dumping and countervailing measures on single-mode optical fibre cables from China, with the applicable rates updated as recently as December 2025, according to the UK’s official trade tariff service. The United States has long maintained tight procurement preferences for domestically produced fibre under Buy America rules tied to federal broadband funding. Fibre and fibre cable, once a poster child for globalised telecom supply chains, has become one of the more heavily fenced product categories in world trade.
Economic Impact: A Market in Oversupply
The direct trade effects of Friday’s extension are modest, because the duties have already done their work. Indian single-mode fibre holds a negligible share of the Chinese market, and bilateral trade in the product is thin. Trading Economics data derived from UN Comtrade show India’s imports from China across the broader optical fibre, fibre bundle and cable category at about 135 million dollars in 2024, while flows from India to China in the narrower fibre category are far smaller. The more meaningful economic question is what the extension signals about the state of the global fibre market.
That market remains in structural oversupply. Global fibre demand surged through the late 2010s on the back of China’s fibre-to-the-home programme and then plateaued, leaving manufacturers in China, India, Japan, South Korea, the United States and Europe with more drawing towers than the market can absorb. Industry analysts have repeatedly documented sharp price declines in fibre since 2018 to 2019, with periodic recoveries driven by grant-funded rural broadband programmes in the West and, more recently, by data centre construction linked to artificial intelligence workloads, which is boosting demand for high-fibre-count cables and specialty fibres.
Against that backdrop, MOFCOM’s core factual claims are plausible on their face. India’s fibre producers do carry capacity well beyond domestic demand: the Indian market has been soft since the completion of the bulk of the country’s 4G backhaul build and the slower-than-expected pace of BharatNet rural fibre rollout, and Indian producers themselves told the DGTR in their own anti-dumping case that they were suffering from underutilisation. Sterlite Technologies, which reports optical fibre and cable capacity among the largest outside China, has publicly oriented its strategy around exports to North America and Europe. If more than 60 percent of Indian capacity must find foreign buyers, as MOFCOM asserts, an open Chinese market absorbing over half of world demand would indeed be a gravitational pull.
The irony is that Chinese producers face the same arithmetic on a much larger scale. China’s fibre giants built capacity for a domestic market that, at its peak, consumed hundreds of millions of fibre kilometres a year, and they now export aggressively as domestic carrier procurement has matured. That is exactly the behaviour India, the EU and the UK have targeted with their own measures. Each fence encourages the next: as one market closes, exporters redirect volume to the remaining open ones, whose producers then petition for protection in turn. The single-mode fibre trade has become a case study in how excess capacity propagates trade remedies around the globe.
For Chinese buyers of fibre, principally the three state carriers and the cable manufacturers that supply them, the extension changes nothing material. Domestic supply is abundant and cheap by world standards, and Chinese network construction is in no scenario constrained by the absence of Indian fibre. The duty’s function is prophylactic: it removes the possibility that Indian producers could use marginal-cost pricing to buy share in Chinese tenders during the next demand upswing.
For Indian producers, the cost is best measured in optionality rather than current revenue. The 7.4 percent rate on Sterlite is not, by itself, prohibitive; in a tight market a competitive exporter could absorb it. The 30.6 percent rate on Aksh Optifibre and Finolex Cables effectively is. But the deeper barrier is the entrenchment of Chinese domestic supply chains over twelve years of protection, which means that even duty-free access would now confront formidable incumbency advantages. The extension confirms that China will remain a closed chapter for Indian fibre strategy through the start of the next decade.
Implications for Importers, Exporters and Supply Chains
For compliance teams, the practical takeaways are straightforward. First, the measures continue without interruption from August 14, 2026, so importers of record in China face no gap in duty liability and no change in cash-deposit practice. Entries of Indian-origin single-mode fibre remain dutiable at the company-specific rates, with the residual rate at the top of the 7.4 to 30.6 percent band. Second, origin management remains the key risk area. Because the duties attach to Indian origin rather than to the exporting country, fibre drawn in India but cabled or transshipped elsewhere can still be caught, while fibre genuinely drawn in third countries is outside scope. Chinese customs and MOFCOM have grown increasingly attentive to circumvention across trade remedy cases generally, and traders handling mixed-origin fibre inventories should ensure their mill certificates and origin documentation can withstand scrutiny.
Third, the extension is a reminder that the fibre and cable trade now operates inside a lattice of overlapping national measures, and routing decisions need to be mapped against all of them. A multinational cable maker sourcing bare fibre must now navigate Chinese duties on Indian fibre, Indian duties on Chinese, Korean and Indonesian fibre, EU and UK duties on Chinese cable, and US procurement rules favouring domestic fibre. Each measure has its own product scope, and the boundaries matter: India’s measures, for instance, are reported to exclude specialty fibres such as G.654 cut-off shifted fibre used in submarine and ultra-long-haul systems, while the Chinese measure covers single-mode fibre broadly. Product engineers and trade counsel increasingly need to work together to determine which SKUs fall inside which fence.
Fourth, for network operators and data centre builders outside China and India, the duties are part of the explanation for regionally divergent fibre prices. Buyers in Southeast Asia, the Middle East, Africa and Latin America, the largest remaining unfenced markets, are the main beneficiaries of the surplus that cannot enter China, India, the EU or the UK at unprotected prices, and both Chinese and Indian exporters are competing hard for those tenders.
Finally, the decision offers a data point on how Beijing intends to manage trade friction with New Delhi during a period of diplomatic repair. Relations between the two countries have been on a mending path since late 2024, when they reached an understanding on border patrolling arrangements and their leaders met on the sidelines of the BRICS summit, followed by steps to restore direct flights and ease business visas. Yet the improvement in atmospherics has not translated into a rollback of trade remedies on either side. India continues to maintain one of the world’s largest portfolios of anti-dumping measures against Chinese goods, spanning chemicals, steel, solar components and telecom inputs, and China has shown with this ruling that it will likewise keep its India-facing measures in force where its domestic industry requests it. Both governments appear to have concluded that trade remedies can be compartmentalised: pursued vigorously at the technical level while the political relationship is managed separately. Qian’s remarks to the Global Times, stressing that “friction in individual sectors” should not disturb warming ties, articulate that compartmentalisation explicitly from the Chinese side.
What to Watch
Three developments bear watching over the new five-year term. The first is whether any Indian producer seeks an interim or new shipper review to obtain an individual duty rate, which would signal renewed commercial interest in the Chinese market; the silence in the expiry review suggests this is unlikely soon. The second is the fate of India’s own measures on Chinese fibre, imposed in 2023 for five years and due for their own sunset process around 2028. The third is demand: if AI-driven data centre construction and national broadband programmes tighten the global fibre market meaningfully, the economics that make these duties largely symbolic could shift, and with them the intensity of the disputes.
For now, the fibre fences stay up. Twelve years after Beijing first moved against Indian fibre, and three years after New Delhi answered in kind, the world’s two most populous countries have settled into a durable equilibrium of mutual exclusion in one of the technologies that connects everything else.