SAN FRANCISCO :Celero Communications, a U.S. startup founded by networking industry veterans, on Monday said it has raised $140 million to build a chip that will help link artificial intelligence data centers across vast distances. The Irvine, California-based firm is designing a chip that will translate the bursts of light sent over fiber-optic cables between data centers into the electrical ones and zeros used in computing networks inside the data centers. Long-distance connections between