LandMark Optoelectronics Corporation (LMOC, 聯亞光電工業股份有限公司) is a company that manufactures GaAs and InP based epi-wafers. Its products include DFB, VCSEL, high power CW laser, silicon photonics, edge emitting epiwafer, etc. The company caters to telecom, industrial, medical, and other sectors.