| 摘要 |
PURPOSE:To avoid a code error in a transmission signal attended with power fluctuation or DC drift in a transmission system by ANDing each optical data signal and electric synchronizing clock. CONSTITUTION:DET61, 62,-6n are biased by a synchronizing clock 100 to apply on/off logic operation. A photodetector output is an AC RZ signal and the signal is demodulated without any error even if there exists such fault as DC drift A 7n, power voltage fluctuation or fluctuation in an identification level DC 8n. |
