Finisar recently started shipping production quantities of its vertical-cavity surface-emitting lasers, or VCSELs. The device is critical to Apple's Face ID recognition system, providing the 3-D sensing capabilities that detect a face. It is part of a feature Apple calls the "Dot Projector" that uses a laser to beam 30,000 infrared dots across the face. The company ran into complications assembling that part earlier this year, creating a production snag for the iPhone X. Apple is expected to roll the Face ID technology across more devices such as the iPad in the months and years ahead, said Gene Munster, managing partner at Loup Ventures, a venture-capital firm specializing in tech research.