| 摘要 |
PURPOSE:To operate a light-emitting element and a photo detector separately, and to adjust an optical axis while preventing the intrusion of noises from an external terminal by adjusting the optical axis for coupling with an optical fiber and cutting a thick film resistor by using a laser. CONSTITUTION:A light-emitting element or a photo detector 2 is formed onto a substrate 4 through bonding wires 3. An optical axis regulation with an optical fiber 6 is performed in such a manner that bias voltage is applied to external terminals 7 and photocurrents are monitored. After an optical coupling is adjusted, thick film resistors 1 are cut by employing a laser. Consequently, cutting sections 9 electrically insulate the photodetector 2 and the external terminals 7. Accordingly, the optical axis can be regulated without using a device modulating input beams and a high-frequency signal measuring device. The intrusion of noises from the external terminals 7 can be prevented.
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