Huatian Industry Co. recently underwent training at Oxford Instruments' (OI) UK manufacturing headquarters on the Ionfab500Plus ion beam optical coating system, which was shipped in March. Left to right: Sean Lee, OI applications engineer; Luo Jun, of Huatian Industry Co.; OI senior test engineers Bob Brake and Alan Cockram; and Tim Jolly, OI senior technologist.   . . .   TriQuint Semiconductor Inc. has made a strategic investment in Quantum Devices Inc. (QDI), a manufacturer of high-performance optical modules.