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Kyocera provides LD/PD submounts. They are ceramic substrates to mount semiconductor laser diodes (LDs) and photo diodes (PDs). Aluminum nitride (AlN) and alumina (Al2O3) ceramics are available. The ceramic submounts are supplied with thin film resistors and gold tin (AuSn) thin film for LD and/or PD attach. |
 Aluminum Nitride (AlN) Submount |
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Kyocera has a multilayer AlN substrate and single layer AlN substrates. Thermal conductivity of the multilayer AlN material is 170W/mK. It can have an electrical ground layer in its layer structure and a step by precision machining. There are three options of the single layer AlN substrates. Thermal conductivity of these substrates are 170, 200 and 230W/mK. Coefficients of thermal expansion of AlN ceramics are close to ones of indium phosphorus (InP) and gallium arsenide (GaAs).
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| Alumina (Al2O3) Submount |
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Thin or thick film metallization of circuit patterns are made on a single layer alumina (Al2O3) ceramic substrate.
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