A new facility in North Texas is starting up its production line for some of the technology that powers the Apple iPhone X's latest features. Silicon Valley-based Finisar has hired 200 people and begun operations at a new plant in Sherman, a city about 65 miles north of Dallas. The facility produces vertical-cavity surface-emitting lasers, or VCSELs, that are used in smartphones. The lasers enable some of the iPhone X's features, such as facial recognition that unlocks the phone, a portrait mode that takes professional-looking photos and a tool that creates animated emojis based on the user's facial expressions. Jeff...