PURPOSE: To attain the monitoring of a normal signal in the constitution not using a switch while decreasing the shape and a drive current by applying the method where a high speed pulse signal passes through a switch after the signal is demodulated into a base band signal and the method where the high speed pulse signal passes directly through a logical switch.
CONSTITUTION: Modulation circuits 1, 11 apply the modulation including a base band component of a modulation signal to a modulation output such as pulse frequency modulation (PFM), pulse phase modulation (PPM), pulse width modulation (PWM) and pulse amplitude modulation (PAM). From an output of amplifier circuits 6 and 16, a signal similar to signal input terminals S1, S2 is demodulated to obtain a pulse modulation signal with less deterioration of waveform. Since the operation of a transmission section of a transmitter is supervised at all times at monitor terminals Ms1, Ms2, a faulty position generated in the transmission system at directions from an input terminal Si1 to an output terminal So1 and from the input terminal Si2 to an output terminal So2 is sectioned to the transmission section including the light source and other parts.
SATOU KENICHI
YONEDA ETSUGO
WATANABE TAKAICHI
| JPS58140175A | 1983-08-19 | |||
| JPS57212838A | 1982-12-27 |
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