SAN JOSE, Calif. — Silicon Catalyst added ON Semiconductor as a partner and two new startups to the dozen that it incubates. The accelerator, focused on semiconductor startups, hopes to expand its geographic footprint in January and launch its first graduates soon. Also in the Silicon Catalyst portfolio are the following startups with their products: ACP Semi: Smart, integrated LEDs Aeponyx: MEMS-based silicon photonics switches Ayar Labs: Optical I/O blocks made in CMOS Chao