• In March 2026, Lightstorm announced it had partnered with Ciena to upgrade the Japan–Guam–Australia submarine cable system, using Ciena's WaveLogic coherent optical technology to quadruple client service capacity and enable 400Gbps services on the Tokyo–Sydney route.
• This upgrade underpins multi-terabit traffic for a leading global cloud platform, highlighting Ciena's role in supporting bandwidth-intensive AI training and inference across a critical Asia-Pacific corridor.
• We’ll now examine how this AI-focused submarine cable upgrade may influence Ciena’s investment narrative built around cloud and optical networking.

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Ciena Investment Narrative Recap

To own Ciena, you need to believe that hyperscalers and carriers will keep investing in high-capacity optical networks for AI and cloud traffic, and that Ciena’s technology can remain central to those buildouts despite heavy customer concentration and rapid technological change. The Lightstorm JGA upgrade reinforces the AI and cloud demand story, but it does not materially change the near term catalyst of hyperscaler spending plans or the key risk of dependence on a handful of large buyers.

Among recent news, Ciena’s March 2026 guidance increase to US$5.9 billion to US$6.3 billion in expected full year revenue is most relevant here. It sets a financial backdrop for the Lightstorm deal by showing how management already framed demand expectations before this subsea AI win, and it gives you a reference point to judge whether ongoing cloud and submarine orders could tighten or loosen the gap between current guidance and future outcomes.

Yet behind the AI submarine cable story, one risk investors should be aware of is how much revenue still hinges on a small group of hyperscale customers...

Ciena's narrative projects $8.7 billion revenue and $1.1 billion earnings by 2029.

Uncover how Ciena's forecasts yield a $340.94 fair value, a 32% downside to its current price.

Exploring Other Perspectives

While consensus leans on strong AI network demand, the most pessimistic analysts warn that if traffic growth slows, Ciena’s reliance on a few hyperscalers could bite hard, even though they were still modeling revenue of about US$6.6 billion and earnings near US$589 million by 2028 before this latest cable win, so it is worth comparing those gloomy assumptions with your own view of how this kind of AI focused subsea project might shift the story.

Explore 9 other fair value estimates on Ciena - why the stock might be worth less than half the current price!

Decide For Yourself

Disagree with existing narratives? Extraordinary investment returns rarely come from following the herd, so go with your instincts.

• A great starting point for your Ciena research is our analysis highlighting 2 key rewards and 1 important warning sign that could impact your investment decision.
• Our free Ciena research report provides a comprehensive fundamental analysis summarized in a single visual - the Snowflake - making it easy to evaluate Ciena's overall financial health at a glance.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.