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The purest optical test stocks trade in Tokyo and Shanghai. santec (6777 JP) got 79% of its April to June revenue from optical measurement. Lianxun (688808 CH) got 78.9% of its revenue from optical communications products in the first nine months of 2025. In the U.S. the share is a lot smaller. $VIAV comes closest at roughly 39% by our math: data center is about half of its network test business, and that business is 78% of revenue. $AEHR is about 20%, from optical device test and burn-in in fiscal 2026. At $FORM, co-packaged optics is a few percent: management expects well over $20M this year, against about $1.03B of annualized revenue. $KEYS and $TER don't split optical out at all. Keysight's commercial communications segment was 54% of its July quarter, and that includes wireless. Two caveats on the top two. santec's segment includes industrial and medical lines, and Lianxun's figure is an older period from its IPO filing. Both still sit far above anything listed in the U.S. Who sells into each test stage is in the full piece.