| 摘要 |
An optical signal receiver is provided for converting an optical signal being intensity-modulated with high frequency signals, to desired frequency electric signals for output. The optical signal receiver ( 50 ) according to the invention receives and converts an optical signal being intensity-modulated with high frequency signals such as a microwave or millimeter wave, to electric signals, which are converted to desired intermediate frequencies by a block down converter ( 52 ). By converting the high frequency signals to the desired intermediate frequencies, the transmission loss through transmission media such as a coaxial cable ( 60 ) can be reduced. Also, the high frequency characteristics required for an electric connector used at a connecting point with the transmission media are alleviated, so that an inexpensive connector can be used.
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