As the view that AI chip valuations have peaked gains wider acceptance, money in U.S. equities is starting to look for the next AI-linked story. One phrase now circulating in that rotation is simple: optics in, memory out.
Why optical communications is being pulled back into the AI trade
In the article, “optics” refers to optical communications, the technology and industry built around transmitting information through light signals, mainly over fiber. The core task is converting electrical signals into optical ones and back again. Key products include optical modules or transceivers, lasers, photodetectors, fiber and other optical components.
This is not a new industry. It has long served telecom backbone networks and traditional data-center interconnection, with the usual strengths of high bandwidth, low loss and resistance to interference. What has changed is the center of demand. The focus is now moving toward high-speed links inside data centers, between racks and servers, and across data centers.
That shift matters because large AI model training and inference depend on massive GPU or accelerator clusters. Those chips need to exchange huge amounts of data, including gradients, parameters and activations, creating very heavy east-west traffic. Copper-based electrical interconnects are running into physical limits in high-speed settings: short transmission distance, faster signal attenuation, higher power use and serious crosstalk. Once single-lane speed reaches 100G or 200G and above, usable copper distance becomes too short to support large-scale cluster expansion.
Optical interconnects address those constraints with higher bandwidth density, longer reach and relatively better energy efficiency. The article frames the relationship in direct terms: GPUs set the ceiling for compute, while optics determines whether that compute can actually be linked into a usable network.
Stock performance is what turned the theme into a trade
The piece argues that the “optics in, memory out” narrative has gained traction because the split in price action between the two groups is now hard to ignore.
On the memory side, companies such as Micron and SK hynix had already seen substantial positioning around tight supply, higher pricing and earnings upgrades. As memory price gains slowed, positioning became crowded, and macro concerns tied to data such as nonfarm payrolls fed worries about growth, capital started trimming exposure and the group came under pressure.
Optical communications names have moved the other way. AAOI, COHR and LITE have rallied on earnings confirmation, faster migration from 800G to 1.6T, and demand tied to AI cluster build-outs. According to the article, money is rotating out of memory, where expectations had already been filled up, and into optical communications, where the earnings slope looks clearer. It says the three major U.S. optical communications names are up roughly 40% to 50% since August.
LITE’s earnings gave the theme its strongest validation
The article treats LITE’s latest earnings release as the point that locked the narrative in more firmly. After the U.S. market close, the company reported revenue and profit above market expectations.
The sharper surprise came from margins. The article says gross margin rose above 50% for the first time, while operating margin reached 36.4%. In the author’s view, that margin profile is unmatched across the broader optical communications group.
Guidance added to the reaction. LITE said it expects operating margin to be around 40% next quarter. The article notes that management had previously thought operating margin would only approach 40% when quarterly revenue reached $2 billion. Now, with expected revenue for next quarter at just $1.25 billion, operating margin is already near that level. In other words, profitability is arriving faster than scale.
The report also points to a multi-quarter pattern: revenue has maintained year-over-year growth of 20% to 25% for several consecutive quarters, while margins continue to expand. For a market focused on growth with visible earnings conversion, that is exactly the setup investors tend to reward.
Two details from the earnings call stood out
The article highlights two management comments from the earnings call.
First, executives repeatedly said the biggest issue for lasers remains insufficient capacity. Demand is still running well ahead of supply, and production speed is not keeping up with customer needs.
Second, management addressed market questions around CPO progress. According to the article, LITE’s largest CPO customer has not delayed production plans. Demand has accelerated instead, leaving the supply-demand gap for ultra-high-power lasers even wider than it was in the prior quarter.
COHR is the next test, but the chase already looks crowded
The next focal point is COHR, another major optical communications company that is set to report its latest earnings the following day. The article presents that release as the next major check on whether the “optics in, memory out” trade can strengthen further.
It also flags the risk. The three major optical communications stocks have already gained about 40% to 50% in August. Entering at these levels carries an obvious momentum-chasing problem. Earnings nights can produce sharp swings, and if COHR disappoints, the pullback from elevated levels could be severe.
The article does not end with a blanket call to buy. Its point is narrower: the narrative may be attractive, but the entry point is awkward. In a market driven by rotating stories, getting in first is not always what matters most.