| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical communication system or the like which can optically transmit a high-quality signal at a low cost. <P>SOLUTION: A light reaching an optical receiver 20 is received with a photoelectric converter 21, and a current signal of a value relative to its photodetecting intensity is output from the converter 21. The current signal output from the converter 21 is input to a current-voltage converter 22, and a voltage signal of a value relative to the value of this current signal is output from the converter 22. The voltage signal V<SB>1</SB>output from the converter 22 is input to a filter 23, the input voltage signal V<SB>1</SB>is filtered by the filter 23 based on predetermined frequency characteristics, and a voltage signal V<SB>2</SB>after being filtered through the filter 23 is output. The frequency characteristics of the filter 23 have a peak in a frequency range of 2 to 4 GHz. <P>COPYRIGHT: (C)2004,JPO |
