| 摘要 |
PURPOSE:To eliminate the need for a complicated circuit such as an automatic threshold level setting circuit even when a direct coupling optical receiver is adopted for an optical receiver of an optical transmitter able to send a burst signal and to realize the provision of a stable reception characteristic against fluctuation of temperature and power supply voltage. CONSTITUTION:Sender sides 1, 2 send a digital signal subject to FSK modulation and receiver sides 4, 5, 6 obtain an optical balanced signal converted from FSK modulation into intensity modulation. The optical signal is converted into an electric balanced signal by two photo diodes 7, 8 and amplifier circuits 9, 10 of the same circuit configuration at the post-stage amplify the signal respectively and a comparator circuit 11 reproduces the digital signal. |
