| 摘要 |
PURPOSE:To realize communication based on a differential signal by two polarized optical signals. CONSTITUTION:In a transmission unit, the signal modulated by a parallel-serial conversion circuit 71 is supplied to driving elements 72 and 73. The signal supplied to the driving element 73 is modulated into the signal having the same phase as or the opposite phase of the signal supplied to the driving element 72 by a polarity inversion signal. Signals are supplied from driving elements 72 and 73 to LEDs 74 and 75 and are converted into optical signals and are transmitted to a reception unit as two optical signals of rightward or leftward circular polarized light by polarizing plates 76 and 77. |
