| 摘要 |
PURPOSE:To achieve an optimum function independently of other systems even for an AC signal amplification system and an optical power monitoring system, by means of simple hardware. CONSTITUTION:The feature of this invension is an independent provision of AC signal amplifying systems 12, 13 and an optical power monitoring system 14. But, both systems are located independently via an AC/DC branch means to a photoelectric conversion element 11. The AC/DC branching means is, e.g., a capacitor 21 and it is located at the input stage of the systems 12, 13. Or a coil 21' can be located in place of the capacitor 21. But this coil is located at the input stage of the optical power monitoring system. |
