| 摘要 |
PURPOSE:To minimize a code error rate by employing two semiconductor light receiving elements of symmetrical junction structure each formed by arranging a couple of Schottky electrodes opposite to each other for a light receiving circuit so as to make an output voltage waveform nearly equal to an original output waveform. CONSTITUTION:Two positive and negative consecutive current pulses with a time difference tw, from a sender side section circuit 5 are inputted to light emitting diodes 21, 22 in anti-parallel connection. The positive current pulse is converted into an optical signal by the light emitting diode 21 and the negative current pulse is converted into an optical signal with a delay of a time tw by the light emitting diode 22. The optical signals are inputted to semiconductor light receiving elements 11, 12 through separate optical transmission sections 31, 32 at a delay of a time tw. Since the positive bias voltage 41 is applied to the element 11 and a negative bias voltage 42 is applied to the element 12 respectively, a positive current pulse and a negative current pulse with a delay of the time tw are provided as an output from the elements 11, 12 respectively. They are two consecutive current pulses having a difference of the time tw at the connection terminal and the original voltage pulse having the pulse amplitude equivalent to the time difference tw is obtained at an output terminal 8 through an integration circuit 6. |
