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Apple signs $390 million deal to lock down key component

iPhone X
Aadhyan Vaka, 6, of Plainsboro, N.J., reacts while playing with the animoji feature of the new iPhone X at the Apple Union Square store Friday, Nov. 3, 2017, in San Francisco. Photo: Eric Risberg / AP

By putting nearly $400 million into Finisar, Apple is returning to a familiar and highly successful page in its playbook.

Why it matters: Finisar makes a key depth sensor for augmented reality, known as a VCSEL, used on the iPhone X. The move could help Apple expand use of the technology while limiting competitors' options.