Kyocera provides ceramic submounts for semiconductor laser diodes and photodiodes in fiber-optic communication modules. Both aluminum nitride (AlN) and aluminum oxide (alumina, Al2O3) ceramic materials are available. The ceramic submounts are possible to supply with thin-film resistors and Au-Sn thin film for either laser diode or photodiode attachment.
Kyocera offers both multilayer and single-layer AlN substrates. Multilayer AlN features thermal conductivity of 150W/mK, with an electrical ground layer integrated into the structure, and a precision-machined step. Three versions of the single-layer AlN substrates are available: with thermal conductivity values of 170, 200 and 230W/mK. AlN ceramics have a coefficient of thermal expansion comparable to that of indium phosphorus (InP) or gallium arsenide (GaAs).
Kyocera offers integrated subcarriers based on multilayer alumina (Al2O3) ceramic technology, which has a low tangent delta. A cavity, differential pair lines and multiple ground via holes are made in the integrated subcarriers to mount an optical waveguide, photodiodes, and transimpedance amplifiers (TIAs).