| 摘要 |
PURPOSE: A system for an optical noise erasable differential detection in a wireless light connection device is provided to remove the influence of a noise light effectively without using an optical filter or an electric filter by amplifying a detection voltage from a photo diode differently and removing a noise component. CONSTITUTION: The first and second photo diodes(10,12) having the same property are connected thereto in serial. A differential amplifier(20) differently amplifies a detection voltage from each photo diodes(10,12), and removes a noise component. A multiplication of a combination ratio of a noise light by a differential amplifying ratio in each photo diodes(10,12) must be '1' for removing the noise component and increasing a signal to noise ratio. |
