| 摘要 |
PURPOSE:To transmit multiplex plural informations in a form of an optical signal by parting a light source from an information source arranged in a space causing possibly an electromagnetic noise so as to improve the immunity of the electromagnetic noise. CONSTITUTION:An optical pulse signal A inputted from a light source provided from a location apart from a space causing possibly an electromagnetic noise via an optical fiber is a pulse having a pulse width of t1 and a period of t2. The said optical pulse signal A>=1 is branched into two (A1, A1') by an optical branching device (CP1)1, and the optical pulse signal A1 is becomes an A2 through a delay line (DL1)4 and inputted to an optical branching device (CP2)2. The optical fiber is used for the delay line D1 and the signal is delayed by a time t3. Further, the optical pulse signal A2 is branched into A3, A3' by the optical branching device 2, an optical pulse signal A3 is retarded by a time t4 by a delay line 5 and inputted to an optical branching device (CP2)3 as an A4. The optical pulse signal A4is branched into A5, A5' at the optical branching device 3 and the optical pulse A5 becomes an optical pulse signal A6 while being retarded by a time t5 at a delay line 6. |
