| 摘要 |
[Problem] An object of the present invention is to stably perform a high speed operation of a laser diode. [Means for Resolution] A driving module of the laser diode has a submount substrate 1 for juxtaposing plural laser diodes 6, 6 . . . , and a driver IC 2. The driver IC 2 has an electric current switch circuit 3 for operating the laser diode 6, a output buffer circuit 4, an input amplifying circuit 5, etc. A power pattern 8 of a band shape is formed on the submount substrate 1 side by side with a line of the laser diodes 6. A connecting pad 14 for supplying an electric current to the electric current switch circuit 3 is arranged adjacently to a connecting portion with each laser diode 6. The operating electric current is supplied from this connecting pad 14 to the electric current switch circuit 3 by wire bonding.
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