Shares of optics maker Corning are tumbling Thursday, likely in response to comments from well-respected Broadcom CEO Hock Tan on the chipmaker’s earnings call the prior evening. But the market reaction seems like a clear-cut overreaction based on Corning’s own guidance and industry outlook. A key pillar of our investment thesis in Corning is the growing use of fiber-optics technology in the data center, ultimately replacing copper as a means to transmit data. On Wednesday night, Tan weighed in on this transition and his commitment to copper in a specific use case appears to what’s driving the decline in fellow Club name Corning. Before digging into Tan’s comments, let’s first define some key terms used when discussing the construction of data centers and, in particular, networking together all the various parts to deliver fast, reliable AI computing. These terms are “scale-up” and “scale-out.” Scale-up refers to the connections within a single server rack — essentially those…